Leser Compact Performance Threaded Safety Relief · PDF fileCATALOG The Safety Valve Compact performance Threaded Safety Relief Valves Series 437 Type 437 · 438 · 439 Series 459

CATALOGThe Safety Valve

Compact performanceCompact performance

Threaded Safety Relief ValvesSeries 437Type 437 · 438 · 439

Series 459Type 459 · 462

LESERFrontview 462 H2 GG4c

Frontview 462 H2 GG SB4c

Frontview 462 H3 GG4c

Frontview 462 H4 GG4c

Series 459Cap H2

Series 459Balanced bellows

design

Series 459Plain lever H3

Series 459Packed lever H4

Series 459Flanged version

SER

Threaded Safety Relief Valves Spring Loaded Contents

Contents

3

Series 437Cap H2

Series 437Flanged version

Series 437Packed lifting device

H4

GeneralApplications 5

Features and Benefits 5

Codes and Standards 5

Overview 6

Series 437 9

Materials 10

How to Order • Numbering System 12• Article Numbers 14• Available Connections 15

Dimensions and Weights 16

Pressure Temperature Ratings 18

Accessories and Options• Caps and Levers 20• Metal Seat 21• Soft Seal 22• Heating Jacket 24

Spare Parts 25

Approvals Series 437 27

Capacities Type 437 28

Capacities Type 438 / 439 30

Specification Sheet 32

Series 459 33

Materials 34

How to Order • Numbering System 40• Article Numbers 42• Available Connections 43

Dimensions and Weights 44

Pressure Temperature Ratings 46

Accessories and Options• Caps and Levers 48• Balanced Bellows 50• Metal Seat 51• Soft Seal 52• Heating Jacket 54• Lift Indicator 55

Spare Parts 56

Approvals Series 459 58

Capacities Series 459 59

Specification Sheet 62

LWN 471.01

LWN 471.02

Threaded Safety Relief Valves Spring Loaded General

4

LESER´ s compact perfor-

mance valves are spring loaded

safety relief valves of specially com-

pact design, developed in close coop-

eration with plant engineers and ser-

vice specialists to protect special

processes and installations against

overpressure.

Extensive testing at the LESER ASME-

certified test lab together with up to

date manufacturing processes ensure

the reliability of these state of the art

products.

LESER´ s compact perfor-

mance valves are designed and

manufactured to highest standards and

compliant with and approved accord-

ing to ASME (Sec. VIII, Div. 1), the

Canadian CRN, the European PED

standard (CE), the German AD 2000-

Merkblatt A2 and those of many other

countries, covering requirements from

end-users, OEM´ s and engineering

companies worldwide.

Type 459 / 462

Type 437 / 438 / 439

LWN 471.03

Threaded Safety Relief Valves Spring Loaded Applications · Features and Benefits · Codes and Standards

5

Applications

LESER´s compact performance valvesrepresent the ultimate solution for criti-cal applications such as

● Air/gas compressors and pumps● Technical gases and CO2 plants● Chemical equipment and piping● Pressure vessels and piping systems

containing gas, air, liquid or steam● LPG/LNG terminals, carriers etc.● Cryogenic systems and oxygen

application ● Thermal relief

Features and Benefits

LESER´s compact performance valvescover a large variety of types, materialsand options to fit any application:Scope of Design● Four valve sizes from 1/2” through

11/2”● Four orifice sizes from 0.3*D through F● Threaded or flanged connections

ANSI or DIN, Inlet rating: class 150#to 2500#

● Standard metal sealing: Type 437 and Type 459 or

● Soft seal: Type 438, 439 and 462● Optional stainless steel bellows for

back pressure compensation● Packed or plain lifting lever or

gastight cap● Heating jacket available for high vis-

cosity fluids

Compact design and High Perform-ance● Single trim for steam, gas and liquid

for less spare parts and easier main-tenance

● Broad set pressure range up to11600 psig

● Self-draining body design, avoidsresidues and reduces corrosion

● One-piece spindle reduces friction ● Unobstructed seat bore for maxi-

mum capacity compared to nominalsize

● Heavy duty design Type 459M● Various materials: chrome steel, stain-

less steel, Monel®‚ or Hastelloy®

● All parts machined from bar stockfor complete valves from specialmaterials within short time

● Variety of capacities and versions,multiple choice of connections to fitany application

Ease of plant design, installation,operation and maintenance● Replaceable nozzle and disc ● Hardened or optional stellited metal

sealing for longer product life● Soft seat for superior tightness● Ringless design, no adjustments

Codes and Standards

LESER´s compact performance valvescomply with the following codes andstandards:

● ASME Section VIII – National Boardcertified capacities (single trim forsteam, gas and liquid service): UV-stamp

● ASME Section II - materials● ASME B 16.34 and ASME B16.5● API 527, NACE MR 0175● CRN● EN ISO 4126-1● PED 97/23/EC (CE-marking),

VdTUEV-SV 100, AD 2000-Merkblatt A2

● Others

The diagram gives a quick overviewabout the main features of LESER’scompact performance valves: capacityand tightness.

LWN 471.04

Threaded Safety Relief Valves Spring Loaded General · Overview

6

Overview

Tightness

Capacity /Orifice

Type 439 Vulcanized soft seal

Type 438 O-ring disc Type 437 Sealing plate

Type 437 Metal to metal

Type 462 O-ring disc Type 459 Sealing plate

Type 459 Metal to metal

Series 437 Series 459

● Type 437: Metal to metal seat● Type 438: Soft seal, o-ring● Type 439: Soft seal, vulcanized

Common Features● Very compact design● Medium capacity● Two standard body materials:

chrome steel, stainless steel● All parts machined from bar stock –

various material options available● Various connections

● Type 459: Metal to metal seat● Type 462: Soft seal, o-ring

Common Features● Compact design● High capacity compared to nominal

sizes: for most common valve size3/4” x 1” up to 1.5*D-orifice capacity

● Four different orifice sizes available● Wide range of set pressures● Optional balanced bellows● Three body materials: cast iron, car-

bon steel, stainless steel ● Various connections

Series 437 Series 459

Selection of Threaded Safety Relief Valves

Criteria

Set Pressure > 2700psig> 6000psig

– – – ✓ ✓ ✓

437 438 439 459 462 e.g. 526

FlangedSRV

– – – ✓ – –High Flow Capacity ≥ D Orificeis required ≥ F Orifice

– – – ✓ ✓ ✓

Thermal Expansion application – – –✓ ✓ ✓

Soft Seats –1 ✓ ✓–1 ✓ ✓

Metal Seats ✓ – ✓✓ – –Temperature > 536 °F ✓ – ✓– – –Temperature < -50 °F ✓ – ✓✓ – –Variable Back Pressure occurs ✓ ✓ ✓– – –Threaded Connections are required ✓ ✓ –✓ ✓ ✓

Flanged Connections are required ✓ ✓ ✓✓ ✓ ✓

– – – – – ✓

Type

437 459Series

Note: 1 Disc with sealing plate (e.g. PTFE) is available.

LWN 471.05


7

Schnitt 459 H2 male4c

Type 437Capacity Orifice 0.5*D Set pressure up to 2610 psigSealing metal to metalDesign very compact

Type 459Capacity Orifice 0.3*D through FSet pressure up to 11600 psigSealing metal to metalDesign compact,

optional bellows,heavy duty design 459M

Capacity/ Orifice

SetPressure[psig]

4590.373 inch2

4590.206 inch2

437Long

Version0.122 inch2

437StandardVersion

0.122 inch2

4590.099 inch2

4590.044inch2

Metal to metal seat

Type 437 and 459 provide for the pro-tection of installations where the metalto metal seat with its wide temperaturerange and good chemical resistance issuitable.

Type 437 and 459 can be equippedwith an optional sealing plate disc forlow temperature soft seat applications.

Metal to metal seat

Type 438, 439 and 462 provide for theprotection of installations where a softseat for superior tightness is requiredlike for hard to hold gases.

Type 439 allows maintained tightnessclose to the set pressure especially atlower set pressures due to the advan-ced design of the vulcanized soft seat.

LWN 471.06


8


Schnitt 439 H2 3 4x1 male4c

Type 438Capacity Orifice 0.5*D Set pressure up to 2610 psigSealing soft seal, O-ringDesign very compact

Type 439Capacity Orifice 0.5*D Set pressure up to 232 psigSealing vulcanized soft seal Design very compact

Type 462Capacity Orifice 0.75*D

through FSet pressure up to 5075 psigSealing soft seal, O-ringDesign compact,

optional bellows

Capacity/Orifice

SetPressure[psig]

438StandardVersion

0.122 inch2

439 0.122 inch2

438Long Version0.122 inch2

4620.099 inch2

4620.206 inch2

4620.373 inch2

Soft seal

Soft seal

LWN 471.07

Threaded Safety Relief Valves Spring Loaded Series 437

9

Series 437

Type 437 / 438 / 439

Type 437 / 438 / 439Flanged Version

LWN 471.08

Threaded Safety Relief Valves Spring Loaded Materials Type 437

Series 437

10

Materials Type 437

Item Part Name Type 4373 Chrome Steel

1 Inlet body SA 479 316L2 Outlet body SA 479 430

7 Disc Hardened stainless steel

12 Spindle AISI 42016 /17 Spring plate AISI 430F

18 Adjusting screwwith bushing

AISI 430FPTFE

40 Cap H2 Steel54 Spring Stainless steel

Flanged Version


Type 4374 Stainless Steel

SA 479 316LSA 479 316L

316L

316L316L

316LPTFE

316L19 Lock nut Steel 316L

Stainless steel57 Pin Stainless steel Stainless steel

61 Ball Hardened stainless steel 316

SA 479 316LSA 479 316L

2.1 Outlet adaptor 316L 316L

48 Inlet flange 316L

2.2 Outlet flange 316L316L316L

40

18

19

16

12

54

61

17

57

2

7

1

2

2.2 2.1

40

18

19

16

12

17

57

61

54

7

48

1

Type 437

Type 437Flanged version

LWN 471.09

Threaded Safety Relief Valves Spring Loaded Materials Type 438 · Type 439

11

Materials Type 438 · Type 439

Item Part NameType 4383Type 4393

Chrome Steel


7 Disc withsoft seal1 316L

12 Spindle AISI 42016 / 172 Spring plate AISI 430F

18Adjusting screw

with bushingAISI 430F

PTFE

40 Cap H2 Steel54 Spring Stainless steel

Flanged Version


Type 4384 Type 4394

Stainless Steel

SA 479 316LSA 479 316L

316L

316L316L

316LPTFE

316L19 Lock nut Steel 316L

Stainless steel57 Pin Stainless steel Stainless steel

61 Ball Hardened stainless steel 316

SA 479 316LSA 479 316L

2.1 Outlet adaptor 316L 316L2.2 Outlet flange 316L48 Inlet flange 316L

316L316L


40

18

19

16

12

54

2

7

1

Schnitt 438 H2 Flansch4c

40

18

16

12

54

2

48

2.2 2.1

7

1


61

17

57

2

7

1

Notes: 1 CR – NeopreneNBR – NitrileEPDM – Ethylene / PropyleneFPM – FluorocarbonFFKM – Kalrez® (Type 438)

– ISOLAST® (Type 439)

2 Item 17 only Type 439

Type 438O-ring seal


Type 439Vulcanized soft seal

LWN 471.10

Threaded Safety Relief Valves Spring Loaded How to Order – Numbering System

Series 437

12

4374.3142 100 psig

Article No. Set Pressure Connections

3Please state unit (in gauge)!

Please do not exceed pressure rangementioned in the spring charts.

Article Number Set Pressure Connections

437 4 314 2

1 2

1

2

3

4

3 4

.

How to OrderNumbering System

Type 437 / 438 / 439

Material Code3 – Body Material Chrome Steel4 – Body Material Stainless Steel

Valve CodeIdentifies valve size, body material and orifice, refer to page 14.

Code for lifting device2 – Screwed cap H24 – Packed lever H4

3Please refer to table “AvailableConnections” on page 15.

Please state one option code for each,inlet and outlet.

2211

V62 V71

Types of sealing

Metal seatMetal-to-metalMetal-to-metal stellited

Soft seatEPDMNBRCRFFKM (Kalrez®)FKM (Viton®)

Plastic seatSP Vespel-SP1PCTFE Kel-FPTDE-FDA Teflon

Type

437

✓✓

✓✓✓

✓✓✓✓✓

✓✓✓✓✓

438 439

LWN 471.11


13

1.1

Options Documentation Code and Medium

L20 H01 L30

44 5 66Please select requested documentation:

Material test certificateDIN EN 10204-3.1

Parts Option Code

Inlet body H01

Outlet body L34

Bonnet L30

Cap/ lever cover L31

Disc L23


1 1

1 2

.

1

2

Code 1. ASME Section VIII2. CE / VdTUEV3. ASME Section VIII

+ CE / VdTUEV

Medium .1 Gases.2 Liquids.3 Steam.0 Steam/Gases/Liquids

(valid only for CE / VdTUEV)

5Type 437 / 438 / 439 Option

Code

• Inlet body stellited L20(Type 437 only)

• Soft seal material(Type 438 / 439 only)

NBR “N” J30EPDM “F” J22CR “K” J21FKM “L” J23FFKM “C” J20

• Heating jacket H29

LWN 471.12

Threaded Safety Relief Valves Spring Loaded How to order · Article Numbers

Series 437

14

How to order

Article Numbers Type 437

Type

Type 437standard version

Packed LeverH4

Cap H2

Set PressureRange [psig]

Packed LeverH4

Cap H2


Orifice[Inch2]

Body MaterialChrome Steel SA 479 430

Body MaterialStainless Steel SA 479 316L

0.122

1.5 - 1348 4373.2602 4373.2604 1.5 - 986 4374.3142 4374.3144

Type 437long version1 1349 - 2610 4373.2612 4373.2614 987 - 2610 4374.3152 4374.3154


TypePacked Lever

H4Cap H2


Packed LeverH4

Cap H2


Orifice[Inch2]

Body MaterialChrome Steel SA479 430


Type 439standard version 0.122 1.5 - 232 4393.2882 4393.2884 1.5 - 232 4394.2892 4394.2894


TypePacked Lever

H4Cap H2


Packed LeverH4

Cap H2


Orifice[Inch2]

Body MaterialChrome Steel SA479 430


Type 438standard version

0.122

7 - 1348 4383.2862 4383.2864 7 - 986 4384.2982 4384.2984

Type 438long version1 1349 - 2610 4383.2872 4383.2874 987 - 2610 4384.2992 4384.2994

Note: 1 The “long version” is a high pressure version with extended outlet body.

LWN 471.13

Threaded Safety Relief Valves Spring Loaded How to Order · Available Connections

15

Notes: 1 Maximum inlet flange class: #15002 Extended center to face dimension outlet: 4 3/4” (120 mm)

Available Connections – Threaded ASME ANSI B1.20.1

1/2” V61 1/2” V58 1/2” V70

3/4” V62 3/4” V59 3/4” V77

1” V63 1” V60 1” V71

OutletInlet

Female NPTMale NPT Female NPTSize Option Code Size Option Code Size Option Code

Available Connections – Flanged ASME ANSI B16.5

OptionCode

ANSI-ClassSize

Outlet

1/2”

150 V24

OptionCode

ANSI-ClassSize

Inlet

1/2”

150 V01

300600 V13300

600 V02

900 V149001500 V03

– –2500 V04

3/4”

150 V15

3/4”

150 V05

300600 V16300

600 V06

900 V179001500 V07

– –2500 V08

1”

150 V18

1”

150 V09

3006001 V19300

600 V10

9002 V209001500 V11

– –2500 V12

Different sizes and flange classes inletand outlet can be combined.Standard flange facing is raised face(RF) according to ASME ANSI B16.5. RJ flange facing as well as other facingsare available.

Male thread

Female thread

Flanged version

LWN 471.14

Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Threaded / Flanged Connections US Units

Series 437

16

Dimensions and Weights Threaded Connections US Units

ConnectionSize

[Inch]

1/2” x 1/2”1/2” x 3/4”

1” x 1”

Orifice[Inch2] Inlet Outlet

Malea c

Femalea b

Center to Face[Inch]

Height[Inch]

Standard

Hmax. Hmax.1 m

Long Version

Weight[lbs]

0.122

1 19/64 1 3/16 8 35/64

8 35/64

8 35/64

8 21/32

8 13/16

9 3/8

9 3/8

9 3/8

9 31/64

9 41/64

3.5

1 19/64 1 7/16

1 23/64

1 3/4

1 3/43/4” x 3/4”3/4” x 1”

1 19/64 1 7/16

1 25/64

55/6455/64

1 1/8

55/6455/64 1 7/16

1 3/4

1 53/64

1 53/64 1 7/16

Note: 1 only Type 437 / 438

Notes: 1 only Type 437 / 4382 for 1/2” ANSI 150: 3 15/16

b

a

s

s

Female thread

Male thread Flanged version

Dimensions and Weights Flanged Connections US Units

ConnectionSize

[Inch]

1/2”3/4”

Orifice[Inch2]

inleta

outletb

Class150

s

Class900/1500

s


Flange Thickness[Inch]

Height[Inch]

Standard

Hmax.

Long Version

Hmax.1

Weight[lbs]

m

0.122 4 31/642 3 15/16

1 5/16

10 7/16 11 17/64 15.51 1/4

11/1611/16

1” 1 9/16

Class2500

s

1 7/16

1 9/16

1 5/83/4

Class300 /600

s

11

1 1/8

LWN 471.15

Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Threaded / Flanged Connections Metric Units

17

Note: 1 only Type 437 / 438

Notes: 1 only Type 437 / 4382 for 1/2” ANSI 150: 100 mm

Dimensions and Weights Threaded Connections Metric Units

ConnectionSize

[Inch]

1/2” x 1/2”1/2” x 3/4”

1” x 1”

Orifice[mm2] Inlet Outlet

Malea c

Femalea b

Center to Face[mm]

Height[mm]

Standard

Hmax. Hmax.1 m

Long Version

Weight[kg]

78.5

33 30 195 216195 216195 216198 219197 218

1.633 37

35

44.544.5

3/4” x 3/4”3/4” x 1”

33 3736

2222

27

2222 37

44.546.546.5 37

Dimensions and Weights Flanged Connections Metric Units

ConnectionSize

[Inch]

1/2”3/4”

Orifice[mm2]

inleta

outletb

Class150

s

Class900 /1500

s

Center to Face[mm]

Flange Thickness[mm]

Height[mm]

Standard

Hmax.

Long Version

Hmax.1

Weight[kg]

m

78.5 1032 100

33

265 286 7321717

1” 39

Class2500

s

37394219

Class300 /600

s

252528

LWN 471.16

Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings Type 437 / 438 / 439 US Units

Series 437

18

Pressure Temperature Ratings Type 437 – US Units1

ValveSize

1/2” – 1”

1/2” – 1”

Orifice[Inch2] Standard Version Long VersionBody Material

min. max. min. max.

Set Pressure Range [psig] Temperature Range

according to ASME [°F]

min. max.

0.122

0.122

Chrome Steel 1.5 1348 1349 2610 - 20 + 428

- 450 + 536Stainless Steel 1.5 986 987 2610

Notes: 1 For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits2 The temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.


ValveSize

1/2” – 1”

1/2” – 1”

Orifice[Inch2] Standard Version Long VersionBody Material

min. max. min. max.


according to ASME [°F ]2

min. max.

0.122

0.122

Chrome Steel 15 1348 1349 2610 - 20 + 356

- 49 + 356Stainless Steel 15 986 987 2610


ValveSize

1/2” – 1”

1/2” – 1”

Orifice[Inch2] Standard VersionBody Material

min. max.


according to ASME [°F ]2

min. max.

0.122

0.122

Chrome Steel 1.5 232 - 20 + 356

- 49 + 356Stainless Steel 1.5 232

LWN 471.17

Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings Type 437 / 438 / 439 Metric Units

19

Pressure Temperature Ratings Type 437 – Metric Units1

ValveSize

1/2” – 1”

1/2” – 1”

Orifice[mm2] Standard Version Long VersionBody Material

min. max. min. max.

Set Pressure Range [bar] Temperature Range

according to ASME [°C]

min. max.

78.5

78.5

Chrome Steel 0.1 93 93 180 - 29 + 220

- 268 + 280Stainless Steel 0.1 68 68 180

Notes: 1 For flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits.2 The temperature is limited by the soft seal material, please refer to soft seal selection table on page 23.


ValveSize

1/2” – 1”

1/2” – 1”

Orifice[mm2] Standard Version Long VersionBody Material

min. max. min. max.


according to ASME [°C]2

min. max.

78.5

78.5

Chrome Steel 1 93 93 180 - 29 + 180

- 45 + 180Stainless Steel 1 68 68 180


ValveSize

1/2” – 1”

1/2” – 1”

Orifice[mm2] Standard VersionBody Material

min. max.


according to ASME [°C]2

min. max.

78.5

78.5

Chrome Steel 0.1 16 - 29 + 180

- 45 + 180Stainless Steel 0.1 16

Series 437 is available with the follow-ing lever designs

● Cap H2● Packed lever H4, threaded design

The packed lever H4 provides somespecial features:● operation by turning the knob anti-

clock wise● remains in open position until the

knob is screwed down again● open and closed position is indicated

LWN 471.18

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Caps and Levers

Series 437

20

Accessories and OptionsCaps and Levers

Item

Body MaterialChrome Steel

Body MaterialStainless Steel

12

Component Cap H2 Packed lever H4 Cap H2 Packed lever H4Lever cover

Cap–

SteelAISI 430F

–AISI 430FAISI 420316SS316SS

Stainless SteelViton

AISI 430FPlastic316SS

316L–

316L316L

316SS316SS

Stainless SteelViton316L

Plastic316SS

–––––––

Plastic316SS

–316L

–––––––

Plastic316SS

2 Knob12 Spindle cap13 Bolt14 Support ring16 Pin19 O-ring22 Stopper23 Seal24 Seal wire

316L 316L316L 316L25 Sealing nose

Materials – subassembly Item 40

16

14

19

13

24

25

23

22

12

2

1

24

25

23

2

Cap H2 Packed lever H4

Closed

Open

LWN 471.19

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Metal Seat

21

The LESER metal seats (disc and nozzle)are lapped to optical flatness to ensurea tight shut off. LESER safety reliefvalves are supplied with a standardleak tightness according to API 527.

Type 4373Standard material for the disc is a hard-ened stainless steel. The combinationof a hard disc material and a softer seatmaterial (316L) provides for improvedwear resistance and longer product life.

Type 4374Disc and seat are provided in 316Lmaterial for highest corrosion resistance.Any other material which is availablefrom bar stock can be supplied as well(e.g. Hastelloy®, Monel®, Alloy20,…).

Metal seat Stellited sealing surfaces

Stellited sealing surfaces For high temperature applications, orapplications with abrasive fluids wearresistant sealing surfaces are recom-mended.The sealing surfaces of the disc, seator nozzle can be stellited by build-up-welding. The minimum thickness of thestellite is 0.06 inch.In addition to the corrosion resistance,the stellited surface also offers a highresistance to impact and suddenchanges in temperature.

Metal Seat (Type 437)

1

57

7.3

7.1

7.2

1

57

7.3

7.1

7.2

Disc Materials subassembly Item 7

7.1

Item

7.27.357

Disc

Part Name

Lifting aidNut Steel 316LPin 316 316

Hardened stainless steel

Hardness 40 – 50 HRC

Type 4373Body MaterialChrome Steel

AISI 430F

316L

Type 4374Body MaterialStainless Steel

316L

7.1

Item

1

Disc

Part Name

Inlet Body

316L stellitedHardness 40 – 45 HRC

Optional stellited sealing surfaces


LWN 471.20

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Soft Seal

Series 437

22

Materials – subassembly Item 7

ItemPart Name Material Part Name Material Material

Type 438 O-ring disc

7.1 Disc 316L

7.2 Lifting aid 316L

7.3 O-ring Refer to soft sealselection table

57 Pin –

Disc

316L with vulcanized soft seal,

refer to soft sealselection table

Lifting aid 316L

Nut 316L

Pin 316

Disc

Lifting aid

Sealing plate

Pin

316L

316L

Refer to soft sealselection table

316

Part Name

Type 439 Vulcanized soft seal disc Type 437 Disc with sealing plate

7.2

7.1

7.3

7.1

7.2

7.3

57

7.1

7.2

7.3

57

Soft SealO-ring disc (Type 438)Vulcanized soft seal (Type 439)Disc with sealing plate (Type 437, optional)

Disc with sealing plate Type 437O-ring disc Type 438 Vulcanized soft seal disc Type 439

Codeletter1

Codeletter1

Codeletter1

ApplicationType 437, 438 and 439 are providedwith a soft seal disc for ● superior tightness● maintained tightness close to the

set pressure

Features and Benefits● three different designs for extended

application range● minimized leakage and product loss ● large selection of soft seal materials● simple replacement of soft seal● standard ARP o-ring sizes● one standard durometer per o-ring

material● reduced maintenance costs

For temperature limits and mediumresistance refer to the soft seal selec-tion table.

Disc with vulcanized soft sealType 439 with a vulcanized soft seatallows maintained tightness close tothe set pressure especially at lower setpressures.

Disc with sealing plateFor applications, where the increasedtightness of a soft seal is required butthe temperature is too low or too highfor an o-ring-disc, e.g. liquefied gases.

Note: 1Code letter: Please refer to soft sealselection table

LWN 471.21


23

Abbre-vationASTM1418

DesignationTrade name

Code-letter1

OptionCode

[°F] [°F]Application2

J49

J48

J44

T

G

A

VESPEL SP-1®

(Polyimide)

Kel-F®

(Polychlorotri-fluoroethylene)

Teflon®

(Polytetra-fluoroethylene)

SP

PCTFE

PTFE

-454

-454

-300

572

400

302

High temperature and high pressure applications (no steam), for chemical resistance refer to manufacturers guide

Cryogenic and refrigeration application, flammable media, gaseous oxygene application up to 725 psig at 140 ºF

Nearly all chemicals

CR Neoprene®

(Chloroprene) K J21 -40 212 Paraffin oil, silicone oil and grease, water and waterbased solvents, refrigerants, ozone

NBR Buna - N®

(Nitrile-Butadiene) N J30 -13 230 Hydraulic oil, vegetable and animal grease and oil

EPDMBuna - EP®

(Ethylene-Propylene -Diene)

D J22 -49 302Hot water and superheated steam up to 302°F, several organic and inorganic acids, silicone oil and grease, FDA compliant

FPM(FKM)

Viton®

(Fluorocarbon) L J23 -4 356

For high temperature service (no superheated steam),mineral oil and grease, silicone oil and grease, vege-table and animal grease and oil, ozone, FDA compliantcompound available on request

FFKM3 Kalrez®

(Perfluoro)

Other Please contact LESER LLC

C J20 32

[°C]

-270

-270

-184

-40

-25

-45

-20

0 482

[°C]

300

204

150

100

110

150

180

250Nearly all chemicals, standard compound is Kalrez® 6375 with steam resistance, FDA compliantcompound available on request

Soft Seal Selection

Notes: 1 The code letters will be stamped on the disc. For soft seal materials other than listed the code letter X will be used.2 Pressure and temperature service must be considered in any case.3 For type 439: material is ISOLAST®.

Type

438

O-r

ing,

Type

439

Vul

cani

zed

soft

seal

Typ

e 43

7 S

ealin

g p

late

TmaxTmin

[psig]max.min.

[bar][psig] [bar]Material

Pressure Range

VESPEL SP-1® 150

Kel-F® 1.5

Teflon® 1.5

10

0.1

0.1

2610

2610

145

180

180

10

Set Pressure LimitsSealing plate disc

Buna-N®, Teflon®, Viton®, VESPEL SP-1®, Neoprene®, Kalrez®

DuPont

Bayer

3M

Buna EP®

Kel-F®

Busak +ShambanISOLAST®

Registered Trademarks Company

LWN 471.22

Threaded Safety Relief Valves Spring LoadedAccessories and Options · Heating Jacket

Series 437

ApplicationPressure relief valves in systems to beprotected from media which are vis-cous, sticky or have a tendency tocrystallize out of solution can be fittedwith a heating jacket. For type 437 the outlet body is fittedwith a fabricated heating jacket. Theposition of the heating connections isshown in figure 1.

Specifications of the heating jacketThe operating data for the heating jacketare shown on a separate name plate.

Available heating connections

24

Operating Pressure

Operating Temperatures

pmax Tmax

260 psig 410 °F

Connection Option Code

Couplings FNPT S02 + H29

Type 437 with heating jacket

Heating Jacket (Type 437)

LWN 471.23

Threaded Safety Relief Valves Spring Loaded Spare Parts · Discs · O-ring

25

Spare Parts

Discs – Type 437 metal to metal seat (Item 7)

Valve Size

Orifice[Inch2]

all 0.122 200.8739.9000 200.8749.9000

Type 4374Stainless Steel

316L

Type 4373Hardened

stainless steel

Discs – Type 438 soft seal with o-ring, disc material: 316L (Item 7)

Valve Size

Orifice[Inch2]

all(standardversion)

0.122 200.8349.9751 200.8349.9741 200.8349.9771 200.8349.9781 200.8349.9791

all(long

version)0.122 200.8549.9053 200.8549.9042 200.8549.9073 200.8549.9083 200.8549.9091

CRNeoprene

K

7/16 x 3/32

ARP 111

7/16 x 3/32

ARP 111

O-ring sizeARP-no.

EPDMEthylene

F

FPM (FKM)Viton

L

NBRNitrile

N

FFKMKalrez®

C

Discs – Type 439 with vulcanized soft seal (Item 7)

Valve Size

Orifice[Inch2]

all 0.122 200.9049.9051 200.9049.9041 200.9049.9071 200.9049.9081 200.9049.9091

CRNeoprene

K

EPDMEthylene

F

FPM (FKM)Viton

L

NBRNitrile

N

FFKMISOLAST®

C

O-ring – Type 438 soft seal (Item 7.3)

Valve Size

Orifice[Inch2]

all 0.122 502.0107.2651 502.0107.2641 502.0107.2671 502.0107.2681 502.0107.2691

CRNeoprene

K

7/16 x 3/32

ARP 111

O-ring sizeARP-no.

EPDMEthylene

F

FPM (FKM)Viton

L

NBRNitrile

N

FFKMKalrez®

C

LWN 471.24

Threaded Safety Relief Valves Spring Loaded Spare Parts · Inlet Bodies

Series 437

Inlet Bodies Types 437 Threaded connections – Material 316L (Item 1)

Size Orifice[Inch2]

1/2” 0.122

Size Orifice[Inch2]

1/2” 0.122136.4449.9204 136.4449.9211

3/4” 3/4” 0.122136.4549.9204 136.4549.9211

1”

0.122

0.122 1” 0.122136.5849.9204 136.5849.9211

Part NumberPart Number

Male NPT Female NPT

Inlet Bodies Types 438 / 439 Threaded connections – Material 316L (Item 1)

Size Orifice[Inch2]

1/2” 0.122

Size Orifice[Inch2]

1/2” 0.122136.4949.9204 136.4949.9211

3/4” 3/4” 0.122136.5449.9204 136.5449.9211

1”

0.122

0.122 1” 0.122136.6849.9204 136.6849.9211

Part NumberPart Number

Male NPT Female NPT

26

LWN 471.25

Threaded Safety Relief Valves Spring Loaded Approvals Series 437 · Rated slope

27

Approvals Series 437

Country

Country

Code

Code

UnitedStates

Canada

ASME Sec. VIII

CRN

Fluid

S / G

S / G / L

L

S / GL

Approval No. Orifice

37213

0.122

0.122

0.122

OG0772.9C

371893719037202

437

Refer to ASME Sec. VIII

438 / 439

437 / 438 / 439

0.4580.3330.4060.322

0.509

Europe PED 97 / 23 / EC(CE-marking)

GermanyAD 2000-

Merkblatt A2

0.3700.4510.358

Type

Coefficient of Discharge1

ASMECertified

K

ASMEMeasured

KD

Fluid

S / GL

S / GL

S / GL

S / GL


072020111Z0008/0/21-1 0.122

TUEV-SV 980

437

αw

438 / 439

437

438 / 439

0.500.350.400.33

0.500.350.400.33

Type Certified Coefficient of DischargeKdr

Others

China: CSBQTSRussia: DIN GOST

Ship classifica-tion authorities: BV, DNV, GL, LROS, RINA

Rated slopeWithin the capacity certification accord-ing to ASME Sec. VIII the coefficientsof discharge for series 437 are issued as“rated slope values” instead of K values.

Rated slope values can be convertedinto K values. The table above showsthe converted K values. The originalrated slope values are listed below.

Notes: 1 Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * KD

For sizing acc. to ASME Sec. VIII K must be used in the sizing equations.

Fluid Rated slope Type 437 Rated slope Type 438/439

S 2.86 lb / hr / PSIA 2.55 lb / hr / PSIA

G 1.02 SCFM / PSIA 0.904 SCFM / PSIA

L 1.54 GPM √PSID 1.49 GPM / √PSID

LWN 471.26

Threaded Safety Relief Valves Spring Loaded Capacities US Units · STEAM · AIR · WATER

Series 437

STEAMASME Section VIII[lb/ hr]

AIRASME Section VIII[S.C.F.M.]

WATERASME Section VIII[US - G.P.M.]

28

Capacities for saturated steam accord-ing to ASME Section VIII (UV), based onset pressure plus 10 % overpressure.Capacities at 30 psig and bellow arebased on 3 psig overpressure.

Capacities for air according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 60 °F.Capacities at 30 psig and below arebased on 3 psig overpressure.

Capacities for water according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 68 °F.Capacities at 30 psig and below arebased on 3 psig overpressure.

Type 437

Set pressure [psig]

Capacities US UnitsOrifice

0.122 Inch2Set pressure

[psig]



[psig]


0.122 Inch2

15 9420 10830 13740 16850 20060 23270 26380 29590 326100 358120 421140 484160 547180 611200 674220 737240 800260 863280 926300 990320 1053340 1116360 1179380 1242400 1306500 1621600 1937700 2253800 2569900100011001200130014001500200025003000

15 33.520 38.630 48.940 60.150 71.460 82.770 93.980 10590 117100 128120 150140 173160 195180 218200 241220 263240 286260 308280 331300 353320 376340 398360 421380 443400 466500 579600 692700 804800 917900 10301000 11431100 12551200 13681300 14811400 15941500 17062000 22702500 28343000

15 6.5420 7.3930 8.8640 10.250 11.460 12.570 13.580 14.590 15.3100 16.2120 17.7140 19.1160 20.5180 21.7200 22.9220 24.0240 25.0260 26.1280 27.1300 28.0320 28.9340 29.8360 30.7380 31.5400 32.3500 36.2600 39.6700 42.8800 45.7900 48.51000 51.11100 53.61200 56.01300 58.31400 60.51500 62.62000 72.32500 80.83000

LWN 471.27

Threaded Safety Relief Valves Spring Loaded Capacities Metric Units · STEAM · AIR · WATER

29

STEAMASME Section VIII[kg / hr]

AIRASME Section VIII[Sm3/ hr]

WATERASME Section VIII[103 kg/ hr]

Capacities for saturated steam accord-ing to ASME Section VIII (UV), based onset pressure plus 10 % overpressure.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Capacities for air according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 16 °C.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Capacities for water according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 20 °C.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Type 437

Set pressure [bar]

Capacities Metric UnitsOrifice

78.5 mm2Set pressure

[bar]



[bar]


78.5 mm2

1 422 613 814 1025 1236 1447 1658 1859 20610 22712 26914 31016 35218 39320 43522 47624 51826 56028 60130 64332 68434 72636 76838 80940 85150 105960 1267708090100110120130140150160170180190200

1 562 813 1094 1375 1656 1927 2208 2489 27610 30412 35914 41516 47018 52620 58222 63724 69326 74828 80430 86032 91534 97136 102638 108240 113850 141660 169470 197280 225090 2528100 2806110 3084120 3362130 3640140 3918150 4196160 4474170 4752180 5030190200

1 1.462 1.983 2.424 2.805 3.136 3.427 3.708 3.959 4.1910 4.4212 4.8414 5.2316 5.5918 5.9320 6.2522 6.5624 6.8526 7.1328 7.4030 7.6632 7.9134 8.1536 8.3938 8.6240 8.8450 9.8960 10.870 11.780 12.590 13.3100 14.0110 14.7120 15.3130 15.9140 16.5150 17.1160 17.7170 18.2180 18.8190200

LWN 471.28

Threaded Safety Relief Valves Spring Loaded Capacities US Units · STEAM · AIR · WATER

Series 437

30




Capacities for saturated steam accord-ing to ASME Section VIII (UV), based onset pressure plus 10 % overpressure.Capacities at 30 psig and bellow arebased on 3 psig overpressure.

Capacities for air according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 60 °F.Capacities at 30 psig and below arebased on 3 psig overpressure.

Capacities for water according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 68 °F.Capacities at 30 psig and below arebased on 3 psig overpressure.

Type 438 / 439

Set pressure [psig]



[psig]



[psig]


0.122 Inch2

15 8320 9630 12140 14950 17760 20570 23380 26190 289100 317120 373140 429160 485180 541200 597220 653240 709260 765280 821300 877320 933340 989360 1045380 1101400 1157500 143760070080090010001100120013001400150020002500

15 3020 3430 4340 5350 6360 7370 8380 9390 103100 113120 133140 153160 173180 193200 213220 233240 253260 273280 293300 313320 333340 353360 373380 393400 413500 513600 613700 713800 813900 9131000 10131100 11131200 12131300 13131400 14131500 15132000 20122500 2512

15 6.3220 7.1530 8.5640 9.8950 11.160 12.170 13.180 14.090 14.8100 15.6120 17.1140 18.5160 19.8180 21.0200 22.1220 23.2240 24.2260 25.2280 26.2300 27.1320 28.0340 28.8360 29.7380 30.5400 31.3500 35.0600 38.3700 41.4800 44.2900 46.91000 49.41100 51.91200 54.21300 56.41400 58.51500 60.52000 69.92500 78.2

LWN 471.29

Threaded Safety Relief Valves Spring Loaded Capacities Metric Units · STEAM · AIR · WATER

31

Capacities for saturated steam accord-ing to ASME Section VIII (UV), based onset pressure plus 10 % overpressure.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Capacities for air according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 16 °C.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Capacities for water according to ASMESection VIII (UV), based on set pressureplus 10 % overpressure at 20 °C.Capacities at 2.07 bar (30 psig) andbelow are based on 0.207 bar (3 psig)overpressure.

Type 438 / 439

Set pressure [bar]



[bar]



[bar]


78.5 mm2

1 372 543 724 915 1096 1287 1468 1649 18310 20112 23814 27516 31218 34920 38622 42224 45926 49628 53330 57032 60734 64436 68038 71740 7545060708090100110120130140150160170180190200

1 502 723 974 1215 1466 1717 1958 2209 24410 26912 31814 36816 41718 46620 51622 56524 61426 66328 71330 76232 81134 86136 91038 95940 100850 125560 150170 174880 199490 2241100 2487110 2734120 2980130 3227140 3473150 3720160 3966170 4213180 4459190200

1 1.422 1.913 2.344 2.705 3.026 3.317 3.588 3.829 4.0610 4.2812 4.6814 5.0616 5.4118 5.7420 6.0522 6.3424 6.6226 6.8928 7.1530 7.4032 7.6534 7.8836 8.1138 8.3340 8.5550 9.5660 10.570 11.380 12.190 12.8100 13.5110 14.2120 14.8130 15.4140 16.0150 16.6160 17.1170 17.6180 18.1190200




LWN 471.30

Threaded Safety Relief Valves Spring LoadedSpecification Sheet

Series 437

32

Specification SheetPlease fax to: 636 326 9185

or your local representative

Company: Phone: Page: of

Location: Fax:

Name: e-mail:

Reference: Date:

GENERAL1 ■ Item No.: 9 ■ Basis of Selection: Code:2 ■ Tag No.: ■■ ASME VIII3 ■ Customer: ■■ PED 97/ 23/ EC (CE-marking) ■■ Fire4 ● Equipment: ■■ other:5 ● Enquiry/Order No.: 10 ■ Documentation: Material test report6 ● Delivery time: ■■ inlet body ■■ outlet body7 ● Number of valves: ■■ other:8 ● Number of spare valves:

SIZING AND SELECTION42 ▲ Required orifice area / units:43 ▲ Selected orifice area / units:44 ▲ Coeff. of discharge:45 ▲ Calculated capacity / units:

ACCESSORIES AND OPTIONS40 ■ Lifting lever: ■■ packed H4 ■■ cap H241 ● Others (specify):

MATERIALS32 ● LESER Material Code ■■ 3: Chrome steel ■■ 4: Stainless steel33 ● LESER Type: ■■ 437 ■■ 438 ■■ 439 37 ● Soft seat ■■ CR ■■ NBR ■■ EPDM34 ■ Inlet body: seal: ■■ FPM ■■ FFKM ■■ other:35 ● Outlet body: 38 ● Spring: ■■ high temp. alloy steel ■■ carbon steel36 ● Disc (Type 437): ■■ SS hardened ■■ 316L ■■ stainless steel ■■ other:

● ■■ other: 39 ● Comply with NACE MR 0175 ■■ Yes ■■ No

VALVE CONSTRUCTION27 ● Orifice Designation:28 ● Connection inlet Connection outlet29 ● Size: Size:30 ● Thread type or Flange class: Thread type or Flange class:31 ● Facing type: ■■ RF ■■ RJ ■■ other: Facing type: ■■ RF ■■ RJ ■■ other:

SERVICE CONDITIONS11 ■ Fluid and state: ■■ Steam (S) ■■ Gas (G) ■■ Liquid (L) ■■ Two phase12 ■ Molecular weight: 20 ■ Set pressure / units:13 ● Coefficient C: 21 ● Operating pressure / units: 14 ● Ratio of specific heats k: 22 ● Cold diff. set pressure / units:15 ● Compressibility factor Z: 23 ■ Const. back pressure / units:16 ■ Spec. gravity / units: 24 ■ Var. back pressure / units:17 ● Viscosity / units: 25 ● Overpressure: ■■ 10 % ■■ ...... %18 ■ Relieving temperature / units: 26 ● Blowdown: ■■ 10 % ■■ 20 %19 ■ Required capacity / units: ■■ ...... %

■ Please fill in these fields in any case.● Please fill in these fields if possible.▲ These fields will be completed by the supplier.

4 3 .Order Code

Article No. Set Pressure Connections Options Documentation Code and Medium

LWN 471.31

Threaded Safety Relief Valves Spring Loaded Series 459

33

Series 459

Type 459 / 462

Type 459 / 462carbon steel

LWN 471.32


Series 459

34

Materials Type 459

Item Part NameType 4593

SGIron

1 Inlet body SA 479 316L2 Outlet body Gr. 60-40-18

7 Disc Hardenedstainless steel

8 Guide AISI 430Ftenifer

9 Bonnet Gr. 60-40-18

12 Spindle AISI 420

16/17 Spring plate Steel

18Adjusting

screw withbushing

AISI 430FPTFE

54

Spring standard

Spring optional

Carbon Steel

High temp.alloy steel or

stainless steel

40

Flanged Version

Threaded Connections

Cap H2 Steel

Type 4592Carbon Steel

SA 479 316LSA 479 316L

Hardenedstainless steel

AISI 430Ftenifer

Carbon SteelSA 105AISI 420

Steel

AISI 430FPTFE

Carbon Steel


stainless steel

Steel

Type 4594 Stainless

Steel

SA 479 316LSA 479 316L


SA 479 316LSA 479 316L

SA 479 316LSA 479 316L

2.1 Outlet adaptor 316L 316L 316L

48 Inlet flange 316L

2.2 Outlet flange 316L316L316L

316L316L

316L

316L

SA 479 316L

316L

316L14 Split ring AISI 430F AISI 430F 316L

316LPTFE

Stainless Steel

316L

19 Lock nut Steel Steel 316L

60 Gasket Graphite / 316L

Graphite / 316L

Graphite / 316L

61 Ball 316 316 316

57 Pin 316 316 316

2.2 2.1

40

18

19

16

12

17

14

60

57

61

54

8

9

48

7

2

1


18

40

19

16

12

17

14

60

61

57

54

8

9

7

2

1Type 459


Schnitt 459 H2 male SB4c

18

40

19

16

12

17

14

60

61

57

60

15

11

54

9

7

2

1

LWN 471.33

Threaded Safety Relief Valves Spring Loaded Materials Type 459 – Balanced Bellows Design

35

Materials Type 459 – Balanced Bellows Design


SGIron


7 Disc Hardenedstainless steel


9 Bonnet Gr. 60-40-18

12 Spindle AISI 420

16 / 17 Spring plate Steel

18Adjusting

screw withbushing

AISI 430FPTFE

54

Spring standard

Spring optional

Carbon Steel


stainless steel

40

Flanged Version


Cap H2 Steel


SA 479 316LSA 479 316L

Hardenedstainless steel

AISI 430Ftenifer

Carbon SteelSA 105

AISI 420

Steel

AISI 430FPTFE

Carbon Steel


stainless steel

Steel

Type 4594 Stainless

Steel

SA 479 316LSA 479 316L


SA 479 316LSA 479 316L

SA 479 316LSA 479 316L


48 Inlet flange 316L2.2 Outlet flange 316L

316L316L

316L316L

316L

316L

SA 479 316L


11 Bonnet spacer SA 479 316L SA 479 316L SA 479 316L

316L15 Bellows 316L 316L 316L

316LPTFE

Stainless Steel

316L


Graphite / 316L

Graphite / 316L

61 Ball 316 316 316

57 Pin 316 316 316


Type 459Balanced bellows design

40

18

16

12

17

60

54

8

9

48

7

2

1

2.2 2.1

LWN 471.34


Series 459

36

Materials Type 462


SGIron


7 Disc with soft seal1 316L


9 Bonnet Gr. 60-40-18

12 Spindle AISI 420

16 Spring plate Steel

18Adjusting

screw withbushing

AISI 430FPTFE

54

Spring standard

Spring optional

Carbon Steel


stainless steel

40

Flanged Version


Cap H2 Steel


SA 479 316LSA 479 316L

316L

AISI 430Ftenifer

Carbon SteelSA 105

AISI 420

Steel

AISI 430FPTFE

Carbon Steel


stainless steel

Steel

Type 4624 Stainless

Steel

SA 479 316LSA 479 316L


SA 479 316LSA 479 316L

SA 479 316LSA 479 316L



316L316L

316L


Graphite / 316L

Graphite / 316L

61 Ball 316 316 316

57 Pin 316 316 316

316L

316L

316L

SA 479 316L

316L



316LPTFE

Stainless Steel

316L


18

40

19

16

12

17

14

60

61

57

54

8

9

7

2

1Type 462


Note: 1CR – NeopreneNBR – NitrileEPDM – Ethylene / PropyleneFPM – FluorocarbonFFKM – Kalrez®

LWN 471.35

Threaded Safety Relief Valves Spring Loaded Materials Type 462 – Balanced Bellows Design

37

Materials Type 462 – Balanced Bellows Design


SGIron


7 Disc with soft seal1 316L


9 Bonnet Gr. 60-40-18

12 Spindle AISI 420

16/17 Spring plate Steel

18Adjusting

screw withbushing

AISI 430FPTFE

54

Spring standard

Spring optional

Carbon Steel


stainless steel

40

Flanged Version


Cap H2 Steel


SA 479 316LSA 479 316L

316L

AISI 430Ftenifer

CarbonSteelSA 105

AISI 420

Steel

AISI 430FPTFE

Carbon Steel


stainless steel

Steel

Type 4624 Stainless

Steel

SA 479 316LSA 479 316L


SA 479 316LSA 479 316L

SA 479 316LSA 479 316L



316L316L

316L


Graphite / 316L

Graphite / 316L

61 Ball 316 316 316

57 Pin 316 316 316

316L

316L

316L

SA 479 316L


11 Bonnet spacer SA 479 316L SA 479 316L SA 479 316L

15 Bellows 316L 316L 316L


316L

316LPTFE

Stainless Steel

316L

Schnitt 462 H2 male SB4c

18

40

19

16

12

17

14

60

61

57

60

15

11

54

9

7

2

1

Type 462Balanced bellows design

Note: 1CR – NeopreneNBR – NitrileEPDM – Ethylene / PropyleneFPM – FluorocarbonFFKM – Kalrez®

LWN 471.36

Threaded Safety Relief Valves Spring Loaded Materials Type 459 · Heavy Duty Design

Series 459

38

Materials Type 459 Heavy Duty Design

Item Part Name

1 Inlet body2 Outlet body7 Disc8 Guide9 Bonnet12 Spindle

16/17 Spring plate

18 Adjusting screw with bushing

54 Spring40


Cap H2

Type 4594 Stainless Steel

SA 479 316LSA 479 316L

316L316L

SA 479 316L316L

316L14 Split ring 316L

316LPTFE

Stainless Steel316L

19 Lock nut 316L

60 Gasket Graphite / 316L61 Ball 316

57 Pin 316

18

40

19

16

12

17

14

60

61

57

54

8

9

7

2

1Type 459Heavy duty design

Type 459Heavy duty design with

balanced bellows

18

40

19

16

12

17

14

60

61

57

60

15

11

54

9

7

2

1

LWN 471.37

Threaded Safety Relief Valves Spring Loaded Material Options Type 4594

39

The Heavy Duty Design of Type 459offers the possibility to easily obtainspecial material versions. The fact thatall product wetted parts are machinedfrom bar stock materials makes it easi-er and faster to fulfill almost all materi-al requirements according to the mate-rial availability.

Two special material levels are avail-able:● Level 1

special materials for the trim =wetted parts in closed position

● Level 2special material for trim and outlet =wetted parts in open position

Material Options Type 4594 Heavy Duty Design

1

Level 1Trim

7

Inlet body

Part NameItem

Level 2Trim and Outlet

Part NameItem

Disc

1

2

Inlet body

Outlet body

7

11

Disc

Bonnet spacer

15

57

Bellows1

Pin

61 Ball

Option Code

Grade HA

Grade MA

Grade DA

Hastelloy®

Monel®

Duplex®

Grade HB

Grade MB

Grade DB

Hastelloy®

Monel®

Duplex®

Material Option Code Material

Note: 1 Available in 316L, Duplex®, Hastelloy®, Inconel®, Monel®. Other materials on request.

LWN 471.38


Series 459

40

How to OrderNumbering System

4594.2552 100 psig

Article No. Set Pressure Connections

3Please state unit (in gauge)!

Please do not exceed pressure rangementioned in the spring charts.

Article Number Set Pressure Connections

459 4 255 2

1 2

1

2

3

4

3 4

.

Type 459 / 462

Material Code2 – Body Material Carbon Steel3 – Body Material SG iron4 – Body Material Stainless Steel

Valve CodeIdentifies valve size, body material and orifice, refer to page 14.

Code for lifting device2 – Screwed cap H23 – Plain lever H34 – Packed lever H4

3Please refer to table “AvailableConnections” on page 43.

Please state one option code for each,inlet and outlet.

2211

V62 V71

Types of sealing

Metal seatMetal-to-metalMetal-to-metal stellited

Soft seatEPDMNBRCRFFKM (Kalrez®)FKM (Viton®)

Plastic seatSP Vespel-SP1PCTFE Kel-FPTDE-FDA Teflon

Type

459

✓✓

✓✓✓

✓✓✓✓✓

462

LWN 471.39


41

1.1


J78 H01 L30

44 5 66Please select requested documentation:

Material test certificateDIN EN 10204-3.1

Parts Option Code

Inlet body H01

Outlet body L34

Bonnet L30

Cap/ lever cover L31

Disc L23


1 1

1 2

.

1

2

Code 1. ASME Section VIII2. CE / VdTUEV3. ASME Section VIII

+ CE / VdTUEV

Medium .1 Gases.2 Liquids.3 Steam.0 Steam/Gases/Liquids

(valid only for CE / VdTUEV)

5Type 459 / 462 Option

Code

• Outlet body L19

heavy duty design

(Type 459)

• Inlet body stellited L20

(Type 459)

• Soft seal material

NBR “N” J30

(Type 462)

EPDM “F” J22

CR “K” J21

FKM “L” J23

FFKM “C” J20

• Stainless steel bellows

p < 580 psig J78

p > 580 psig J78 + J55

Hastelloy® J81

• Elastomer bellows J79



bonnet spacer

• High temperature X01

alloy spring

• Stainless steel spring X04

LWN 471.40

Threaded Safety Relief Valves Spring Loaded How to Order · Article Numbers

Series 459

42

How to order


CapH2

Plain LeverH3

Packed LeverH4

CapH2

CapH2

Plain LeverH3

Packed LeverH4

Orifice[Inch2]

Type 4593Body Material

SG Iron

Type 4592Body MaterialCarbon Steel


Packed LeverH4

0.099 4593.2504 4593.2503 4592.2472 4592.2474 4592.2473 4594.25524593.2502 4594.2554

0.206 4593.2514 4593.2513 4592.2482 4592.2484 4592.2483 4594.25624593.2512 4594.2564

0.373 4593.2524 4593.2523 4592.2492 4592.2494 4592.2493 4594.25724593.2522 4594.2574


CapH2

Plain LeverH3

Packed LeverH4

CapH2

CapH2

Plain LeverH3

Packed LeverH4

Orifice[Inch2]


SG Iron



Packed LeverH4

0.099 4623.2904 4623.2903 4622.3772 4622.3774 4622.3773 4624.29524623.2902 4624.2954

0.206 4623.2914 4623.2913 4622.3782 4622.3784 4622.3783 4624.29624623.2912 4624.2964

0.373 4623.2924 4623.2923 4622.3792 4622.3794 4622.3793 4624.29724623.2922 4624.2974

Article Numbers Type 459Heavy duty design

Packed LeverH4

CapH2

Orifice[Inch2]


0.044 (L) 4594.253414594.25321

0.044 (S/G) 4594.254424594.25422

0.099 4594.25844594.25820.206 4594.25944594.2592

Notes: 1 Liquid service2 Steam and gas service

Article Numbers Type 462Heavy duty design

Packed LeverH4

CapH2

Orifice[Inch2]


0.099 4624.22544624.2252

0.206 4624.22744624.2272

LWN 471.41

Threaded Safety Relief Valves Spring Loaded How to Order · Available Connections

43

Available Connections – Threaded Option codes

0.044Size

Inlet Male NPT

Orifice [Inch2]

Inlet Female NPT Outlet Female NPT

1/2” V61

3/4” V62

1” V63

11/2” –

V61

V62

V63

–

0.206

V61

V62

V63

–

0.373

–

–

V63

V64

Notes: 1 maximum inlet flange class: #15002 extended center to face dimension outlet: 4 3/4” (120 mm)

0.099 0.044SizeOrifice [Inch2]

1/2” V58

3/4” V59

1” V60

11/2” –

V58

V59

V60

–

0.206

V58

V59

V60

–

0.373

–

V59

V60

V75

0.099 0.044SizeOrifice [Inch2]

1/2” –

3/4” –

1” V71

11/2” –

–

–

V71

V72

0.206

–

–

V71

V72

0.373

–

–

–

V72

0.099

Available Connections – Flanged ANSI B16.5 Option codes

ANSI-ClassSize

InletOrifice [Inch2]

OutletOrifice [Inch2]

1/2”

150300 / 600900 / 1500

2500

0.044V01V02V03V04

0.099V01V02V03V04

0.206––––

0.373––––

ANSI-ClassSize

–

0.044 0.099 0.206––––

––––

––––

––––

0.373––––

3/4”

150300 / 600900 / 1500

2500

V05V06V07V08

V05V06V07V08

V05V06V07V08

V05V06V07V08

1”

150300 / 600900 / 1500

2500

V09V10V11V12

V09V10V11V12

V09V10V11V12

V09V10V11V12

11/2”–––

–––

–––

–––

–––

–

––––

––––

––––

––––

––––

1”

V18V19V20

–

V18V19V20

–

V18V19V20

–

150300 / 6001

9002

–

––––

11/2”V21V22V23

V21V22V23

–––

150300 / 600

900

V21V22V23


Male thread

Schnitt 459 H2 female4c

Female thread Flanged version

LWN 471.42

Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Type 459 / 462

Series 459

44

Male thread Female thread Flanged version

Dimensions and Weights Threaded Connections US Units

ConnectionSize

[Inch]

1/2” x 1”3/4” x 1”

1” x 11/2”

Inlet Outlet

Inlet Outlet

Malea c

Femalea b


Height[Inch]

Standard

Hmax. Hmax.1 m

Bellows

Weight[lbs]

1 3/4

2 61/64

11 11/16

11 11/16

11 27/32

11 27/32

12 1/64

12 1/8

12 61/64

12 61/64

13 7/64

13 7/64

13 17/64

13 25/64

5.7 5.75.76.66.66.6

1 3/4

1 57/64

2 11/64

2 11/64

1” x 1”3/4” x 11/2”

1 47/64

1 29/32

2 11/64

2 1/4

2 1/4

11/2” x 11/2” 2 1/8

55/6455/64

1 1/8

1 1/855/64

1 1/8 2 63/64

Note: 1 not for orifice 0.044 inch2

Dimensions and Weights Flanged Connections US Units

Orifice[Inch2]

0.0440.099

150 RF –2500 RF

a


Height[Inch]

Standard

H

Bellows

H

Weight[lbs]

m

12 63/64

12 63/64

12 63/64

13 7/64

–14 1/4

14 1/4

14 3/8

17.6

3 15/16

3 15/16

0.206 3 15/16

0.373 4 9/64

300 RJ –1500 RJ

a

4 7/32

4 7/32

4 7/32

4 9/16

2500 RJ

a

4 31/64

4 31/64

4 31/64

4 27/32

150 RF –600 RF

b

3 15/16

LWN 471.43

Threaded Safety Relief Valves Spring Loaded Dimensions and Weights Type 459 / 462 · Flange Thickness

45

Dimensions and Weights Threaded Connections Metric Units

ConnectionSize

[Inch]

1/2” x 1”3/4” x 1”

1” x 11/2”

Inlet Outlet

Malea c

Femalea b

Center to Face[mm]

Height[mm]

Standard

Hmax. Hmax.1 m

Bellows

Weight[kg]

45

75

275275274279278281

307307306311310313

2.6 2.62.6333

45

48

5555

1” x 1”3/4” x 11/2”

4449

555757

11/2” x 11/2” 54

2222

27

2722

27 76

Note: 1 not for orifice 0.044 inch2

Flange Thickness US Units Flange Thickness Metric Units

ConnectionSize

[Inch]

1/2”3/4”

Class 150

s

Flange Thickness[Inch]

5/811/16

1” 3/4

11/2” 15/16

Class300/600

s

15/1615/16

1 1/8

1 3/16

Class900/1500

s

1 1/4

1 1/4

1 9/16

1 9/16

Class2500

s

1 7/16

1 1/2

1 5/8

2

ConnectionSize

[Inch]

1/2”3/4”

Class 150

s

Flange Thickness[mm]

1717

1” 1911/2” 24

Class300/600

s

25252831

Class900/1500

s

33323940

Class2500

s

37394253

Inlet Outlet

Dimensions and Weights Flanged Connections Metric Units

Orifice[mm2]

28.263.6

150 RF –2500 RF

a

Center to Face[mm]

Height[mm]

Standard

Hmax.

Bellows

Hmax.

Weight[kg]

m

330330330333

–

362362365

8

100100

133 100

241 105

300 RJ –1500 RJ

a

107107107116

2500 RJ

a

114114114

123

150 RF –600 RF

b

100

LWN 471.44

Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings US Units – Type 459 / 462

Series 459

46

Notes: 1 for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits2 the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53

Pressure Temperature Ratings US Units1 – Type 459

Orifice[Inch2]

0.0440.0990.206

min.

Set Pressure Range[psig]

Temperature Range acc. to ASME[°F]

max. min. with bellows

min.

Carbon Steel Stainless Steel

max. min. max.

15021.82.9

0.373 2.9

8550 (11600)3

580029001450

–43.543.543.5

- 20 +800 2

min.

SG Iron

max.

- 20 + 572

min.SG Iron

max.

- 20 + 356

- 300 +800 2

Stainless SteelHeavy Duty Design

min. max.

- 450 +1000 2

Pressure Temperature Ratings US Units1 – Type 462

Orifice[Inch2]

0.0990.206

min.

Set Pressure Range[psig]

Temperature Range acc. to ASME[°F]2

max. min. with bellows min.

Carbon Steel Stainless Steelmax. min. max.

7.32.9

0.373 2.9

507529001450

43.543.543.5

- 20 + 356 - 49 +356

Notes: 1 for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits2 above 572 °F / 300 °C stainless steel bellows is required for spring heat protection3 value in brackets: special spring required, expect longer lead time

LWN 471.45

Threaded Safety Relief Valves Spring Loaded Pressure Temperature Ratings Metric Units – Type 459 / 462

47

Pressure Temperature Ratings Metric Units1 – Type 459

Orifice[mm2]

28.263.6133

min.

Temperature Range acc. to ASME[°C]

Set Pressure Range[bar]

max. min. with bellows

min.

Carbon Steel Stainless Steel

max. min. max.

101.50.2

241 0.2

590 (800) 3

400200100

–333

- 29 + 427 2

min.

SG Iron

max.

- 29 + 300 - 184 + 427 2

Stainless SteelHeavy Duty Design

min. max.

- 268 +538 2

Pressure Temperature Ratings Metric Units1 – Type 462

Orifice[mm2]

63.6133

min.

Temperature Range acc. to ASME[°C]2

Set Pressure Range[bar]

max. min. with bellows min.

Carbon Steel Stainless Steelmax. min. max.

0.50.2

241 0.2

350200100

333

- 29 + 180

min.SG Iron

max.

- 29 + 180 - 45 +180

Notes: 1 for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits2 above 572 °F / 300 °C stainless steel bellows is required for spring heat protection3 value in brackets: special spring required, expect longer lead time

Notes: 1 for flanged versions the pressure temperature rating acc. to ANSI B 16.34 may supersede these limits2 the temperature is limited by the soft seal material, please refer to soft seal selection table on page 53

LWN 471.46


Series 459

48

Series 459 is available with the follow-ing lever designs

● Cap H2● Plain lever H3● Packed lever H4● Test gag, available for cap H2 and

packed lever H4

Body MaterialCarbon Steel or SG Iron

Lever cover

Body MaterialStainless Steel

1.1

Component

–

Cap H2

Gr. 60-40-18

Plain Lever H3

Gr. 60-40-18

Packed Lever H4

–

Cap H2

CF8MCap2 Steel – – 316L –

Spacer3 a – – 316L – 316LHex screw3 b – B7 – – –Shaft / Bolt4 / 1.4 – Steel Steel – 316LLifting fork1.5 – Carbon Steel Carbon Steel – 316L

Lever6 / 1.6 – Carbon Steel Carbon Steel – 316SSWasher1.7 – Carbon Steel Carbon Steel – 316SS

Nut1.8 – – 2H – 8MO-ring1.9 – – Viton – –

Bushing1.9 – – – – GraphiteRetaining clip1.10 – Carbon Steel Carbon Steel – –

Nut1.10 – – – – 316LSupport ring1.11 – – Carbon Steel – 316SSSpindle cap12 – Carbon Steel Carbon Steel – 316L

Pin13 – 316SS 316SS – 316SSRetaining clip14 – 316SS 316SS – 316SS

Plug22 – Plastic – – –Seal23 Plastic Plastic Plastic Plastic Plastic

Seal wire24 316SS 316SS 316SS 316SS 316SSSealing nose25 316L – – 316L –

Packed Lever H4Item

Materials subassembly Item 40

Accessories and OptionsCaps and Levers

1

12

14

13

23

24

4

10

22

3b

6

24

25

23

2

Cap H2 Plain lever H3

Test gag93 316SS – 316SS 316SS 316SSWasher93.5 Fiber – Fiber Fiber Fiber

LWN 471.47


49

12

13

1.5

1.6

1.8

1.7

1.10

1.11

1.9

1.4

23

14

24

1

3a

93 93.5

Packed lever H4 Test gag

BLOCKED.Remove after

testing!

ApplicationBellows protect the guides, movingparts and the spring from dirt, corros-ion, impurities or temperature to guar-antee the proper function of the safetyrelief valve. Additionally they providefor back pressure compensation1.

DesignSeries 459 with balanced bellows isprovided with a bonnet spacer tohouse the bellows. The spacer servesfor cooling and shields the bellowsagainst turbulences during dischargeto avoid vibration and to guaranteelonger lifetime.

LWN 471.48

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Balanced Bellows

Series 459

50

Materials and Limits of Application

Bellows materialBellows joint materials

Temperature limits (Type 459)

Built up back pressure limit 3

Superimposed back pressure limit 3

Minimum set pressure limit

Maximum set pressure limit

316L

Standard

316L316L

Heavy Duty

316L

up to 752 °F

max. 35 % of set pressure, not to exceed the maximum bellows back pressure limit

232 psig 580 psig

43.5 psig 580 psig

580 psigacc. to set

pressure limit of the valve

Hastelloy® C

Hastelloy®

Hastelloy® CInconel®

Inconel®

Inconel®

Option codes J78 J78 + J55 J81(Hastelloy®)

J78 + S15(Inconel®)

Notes: 1 The bellows for type 459/462 is back pressure compensating for orifice size 0.206 Inch2

(133 mm2). It is over compensating for orifice size 0.099 Inch2 (63,6 mm2) and under compensatingfor orifice size 0.373 Inch2 (241 mm2). Please ask factory for details.2 Type 4594 with heavy duty body: up to 1022 °F, the temperature limits for type 462 depend onother parts e.g. soft seal materials.3 The so called built up back pressure limit defines limit for which the proper function of thepressure relief valve is ensured. The superimposed back pressure limit of a bellows refers onlyto the static stability of the bellows design and does not consider the influence of the backpressureon the opening and closing of a pressure relief valve.

Conversion kits are available for aneasy change from a conventionaldesign to a balanced bellows design.Conversion kits contain all necessaryparts which must be replaced (bellows,spacer, spindle and gaskets). Please refer to page 56 Spare Parts.

Balanced Bellows

LWN 471.49

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Metal Seat

51

Discs with stellited sealing surfacesFor high temperature applications above842 °F, or applications with abrasivefluids wear resistant sealing surfacesare recommended.The sealing surfaces of the disc, seator nozzle can be stellited by build-up-welding. The minimum thickness of thestellite is 0.06 inch.In addition to the corrosion resistance,the stellited surface also offers a highresistance to impact and suddenchanges in temperature.


7.1

Item

7.27.357

Disc

Part Name

Lifting aidRetaining clip 316L 316L

Pin 316 316

Hardened stainless steelHardness 40 – 50 HRC


316L316L316

Hardened stainless steelHardness 40 – 50 HRC


SG Iron

316L

316L


316L

The LESER metal seats (disc and nozzle)are lapped to optical flatness to ensurea tight shut off. LESER safety reliefvalves are supplied with a standardleak tightness according to API 527.

Type 4592 / Type 4593Standard material for the disc is a hard-ened stainless steel. The combinationof a hard disc material and a softer seatmaterial (316L) provides for improvedwear resistance and longer product life.

Type 4594Disc and seat are provided in 316Lmaterial for highest corrosion resist-ance. Any other material which is avail-able from bar stock can be supplied aswell (e.g. Hastelloy®, Monel®,Alloy20,…).

Metal Seat (Type 459)

Metal seat Stellited sealing surfaces

7.1

57

7.37.2

1

7.1

57

7.37.2

1

7.1

Item

1

Disc

Part Name

Inlet Body


Optional stellited sealing surfaces


LWN 471.50


Series 459

52


1

Item

23

57

DiscPart Name Material

Lifting aidRetaining clip 316L

4 Sealing plate Refer to soft seal selection table

Pin

1

Item

23

57

DiscPart Name Material

Lifting aidPin

4O-ring

Pin 316

316L

Type 459 Disc with sealing plate

316L316

Refer to soft seal selection table

316

316L316L

Type 462 O-ring disc

Soft SealO-ring disc (Type 462)Disc with sealing plate (Type 459, optional)

ApplicationType 459 and 462 are provided with asoft seal disc for● superior tightness● maintained tightness close to the

set pressure

Features and Benefits● two designs with o-ring or sealing

plate for extended application range● minimized leakage and product loss● large selection of soft seal materials● simple replacement of soft seal● standard ARP o-ring sizes● reduced maintenance costs● one standard durometer per o-ring

material

For temperature limits and mediumresistance refer to the soft seal selec-tion table.

57

3

1

4

2

57

3

1

4

2

Disc with sealing plate Type 459O-ring disc Type 462

Disc with sealing plateFor applications, where the increasedtightness of a soft seat seal is requiredbut the temperature is too low or toohigh for an o-ring-disc, e.g. liquefiedgases.

LWN 471.51


53

Code DesignationTrade name

Code-letter 1

OptionCode

Tmin

[°F] [°C] [°F] [°C]

Tmax

Application2

J49

J48

J44

T

G

A

VESPEL SP-1®1

(Polyimide)

Kel-F®

(Polychlorotri-fluoroethylene)

Teflon®

(Polytetra-fluoroethylene)

SP

PCTFE

PTFE

-454

-454

-300

-270

-270

-184

572

400

302

300

204

150

High temperature and high pressure applications (no steam), for chemical resistance refer to manufacturers guide

Cryogenic and refrigeration application, flammable media, gaseous oxygene application up to 725 psig at 140 ºF

Nearly all chemicals

CR Neoprene®

(Chloroprene) K J21 -40 212 Paraffin oil, silicone oil and grease, water and waterbased solvents, refrigerants, ozone

NBR Buna - N®

(Nitrile-Butadiene) N J30 -13 230 Hydraulic oil, vegetable and animal grease and oil

EPDMBuna - EP®

(Ethylene-Propylene -Diene)

D J22 -49 302Hot water and superheated steam up to 302°F, several organic and inorganic acids, silicone oil and grease, FDA compliant

FPM(FKM)

Viton®

(Fluorocarbon) L J23 -4 356

For high temperature service (no superheated steam),mineral oil and grease, silicone oil and grease, vege-table and animal grease and oil, ozone, FDA compliantcompound available on request

FFKM Kalrez®

(Perfluoro)

Other Please contact LESER LLC

C J20 32

-40

-25

-45

-20

0 482

100

110

150

180

250Nearly all chemicals, standard compound is Kalrez® 6375 with steam resistance, FDA compliantcompound available on request

Soft Seal Selection

Notes: 1 The code letters will be stamped on the retainer (Item 2). For soft seal materials other than listed the code letter X will be used.2 Pressure and temperature service must be considered in any case.

Typ

e 46

2 O

-rin

gTy

pe

459

Sea

ling

pla

te

[psig]max.min.

[bar][psig] [bar]Material

Pressure Range

VESPEL SP-1® 150

Kel-F® 2.9

Teflon® 2.9

10

0.2

0.2

5800

4350

145

400

300

10

Set Pressure LimitsSealing plate disc

Buna-N®, Teflon®, Viton®, VESPEL SP-1®, Neoprene®, Kalrez®

DuPont

Bayer

3M

Buna EP®

Kel-F®

Registered Trademarks Company

LWN 471.52

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Heating Jacket

Series 459

54

ApplicationPressure relief valves in systems to beprotected from media which are vis-cous, sticky or have a tendency tocrystallize out of solution can be fittedwith a heating jacket. For type 459 the outlet body is fittedwith a fabricated heating jacket. Theposition of the heating connections isshown in the drawing.

Balanced Bellows DesignFor safety relief valves with balancedbellows, the bonnet spacer required tohouse the bellows is fitted with anadditional heating jacket. Both heatingjackets are joined by a tubing.

Specifications of the heating jacketThe operating data for the heating jacketare shown on a separate name plate.

Available heating connections

Operating Pressure

pmax

260 psig

Operating Temperatures

Tmax

572 °F

Type 459 with heating jacket

Connection Option Code

Couplings FNPT H29

Heating Jacket

LWN 471.53

Threaded Safety Relief Valves Spring Loaded Accessories and Options · Lift Indicator

55

Lift indicators are an important compo-nent for automation. They are used tomonitor operating status.As an option, Series 459 can be providedwith an inductive proximity switch. The lift indicator will indicate an open-ing of the pressure relief valve when thevessel pressure has increased so thatthe valve opens with a “pop”.LESER provides DC proximity switchestype “N” using two-wire technology.These intrinsically safe proximity swit-ches can be used in explosion hazardarea zone 0. Other types of switchescan be used as well.

The lift indicator option is available forseries 459 in combination with thepacked lever H4 either with or withoutproximity switch.The connection size is M18 x 1.

A = closed positionB = open position

94B A

Lift Indicator (proximity switch)

Option Option Code

J39Lifting device H4 with adaptor for lift indicator M18 x 1

J93Lift indicator type PEPPERL + FUCHS NJ5-18GK-N (5 V to 25 V d.c.)

LWN 471.54

Threaded Safety Relief Valves Spring Loaded Spare Parts · Discs

Series 459

56

Spare Parts

Discs – Type 459 metal to metal seat (Item 7)

Orifice[Inch2]

0.044

0.099

0.206

Type 4592 / 4593Hardened stainless steel

–

200.2039.9000

200.2139.9000

200.2239.9000

Steam and gas service: 200.3269.9118Liquid service: 200.3969.9118

200.2049.9000

200.2149.9000

200.2249.9000

Type 4594316L

0.373

Discs – Type 462 soft seal, disc material: 316L (Item 7)

Orifice[Inch2]

0.099

0.206

0.373

0.099

0.207

0.373

FFKMKalrez®

NBRNitrile

FPM (FKM)Viton®

EPDMEthylene

CRNeopreneO-ring size

ARP-no.

CNLDK

200.9349.9091200.9349.9081200.9349.9071200.9349.9041200.9349.90511/2 x 3/32

ARP 112

On Request200.4549.9081200.4549.9071200.4549.9041200.4549.90519/16 x 3/32

ARP 113

On Request200.4649.9081200.4649.9071200.4649.9041200.4649.905113/16 x 3/32

ARP 117

502.0123.2691502.0123.2681502.0123.2671502.0123.2641502.0123.26511/2 x 3/32

ARP 112

On Request502.0139.2681502.0139.2671502.0139.2641502.0139.26519/16 x 3/32

ARP 113

On Request502.0202.2681502.0202.2671502.0202.2641502.0202.265113/16 x 3/32

ARP 117

Orifice[Inch2]

FFKMKalrez®

NBRNitrile

FPM (FKM)Viton®

EPDMEthylene

CRNeopreneO-ring size

ARP-no.

CNLDK

O-ring – Type 462 soft seal (Item 7)

LWN 471.55

Threaded Safety Relief Valves Spring Loaded Spare Parts · Inlet Bodies · Inlet Bodies and Flanges · Bellows · Gaskets

57

Inlet Bodies Type 459 / 462 Threaded connections – Material 316L (Item 1)

Female NPTMale NPT

1/2”

0.044136.6969.9204

3/4” 136.7069.92041” 136.7169.9204

3/4”

0.099

136.7549.92041” 136.7649.9204

11/2” 136.7849.92043/4”

0.206

136.8049.92041” 136.8149.9204

1”0.373

136.3649.920411/2” 136.8649.9204

11/2”

1/2”3/4”1”

3/4”1”

11/2”3/4”1”

1”11/2”

11/2”136.8349.9204

Size Orifice [Inch2]

0.044136.6969.9211136.7069.9211136.7169.9211

0.099136.7549.9211136.7649.9211136.7849.9211

0.206136.8049.9211136.8149.9211

0.373136.3649.9211136.8649.9211

136.8349.9211

Size Orifice [Inch2] Inlet BodyInlet Body

Bellows and Bellows Conversion Kits – Material 316L (Item 15)

all1 p ≤ 580 psig (40 bar)

p > 580 psig (40 bar)

400.7949.0000

all1 400.6349.0000

5021.1050

5021.1051

Valve Size Set pressure Conversion KitBellows

Note: 1 The bellows for type 459 / 462 is back pressure compensating for orifice size 0.206 In2 (133 mm2).

Gaskets Body – Bonnet (Item 60)

all 500.2407.0000

500.2405.0000

Graphite + 316 SS

all Gylon (filled PTFE)

Valve Size Gasket Material

LWN 471.56

Threaded Safety Relief Valves Spring Loaded Approvals Series 459

Series 459

58

Approvals Series 459

Country

Country

Code

Code

UnitedStates

Canada

ASME Sec. VIII

CRN

Fluid

S / G

S / G / L

L


37112 AllAll

AllOG0730.9C

37101459 / 462

459 / 462

0.8110.566

Refer to ASME-code

0.901

Europe PED 97/23/EC(CE-marking)

GermanyAD 2000-

Merkblatt A2

0.629

Type

Coefficient of Discharge1

ASMECertified

K

ASMEMeasured

KD

Fluid

S / GL

S / GL

S / GL

S / GL

S / GL

S / GL

S / GL

S / GL


072020111Z0008/0/13

0.044

0.099

0.206

0.373

0.044

0.099

0.206

0.373

TUEV-SV 909

459 / 462

αw

459 / 462

0.810.700.830.610.810.532

0.790.52

0.810.700.830.610.810.532

0.790.52

Type Certified Coefficient of DischargeKdr

Others

China: SELO / AQSIQ (SQLBPV)Russia: DIN GOST

Ship classifica-tion authorities: BV, DNV, GL, LROS, RINA

Note: 1 Acc. to ASME Sec. VIII the certified coefficient of discharge K is calculated by K = 0.9 * KD

For sizing acc. to ASME Sec. VIII K must be used in the sizing equations.2 Type 462: Kdr = 0.61 / αw = 0.61

LWN 471.57

Threaded Safety Relief Valves Spring Loaded Capacities US Units / Metric Units · STEAM

59



0.044 0.099 0.206 0.373Set pressure

[psig]

Capacities US UnitsOrifice[Inch2]

28.2 63.3 133 241Set pressure

[bar]

Capacities Metric UnitsOrifice[mm2]

Capacities for saturated steam according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure. Capacities at 30 psig (2.07 bar) and bellow are based on 3 psig (0.207 bar) overpressure.

15 281 50920 155 324 58630 196 410 74240 242 504 91350 287 599 108560 332 693 125670 377 788 142780 423 882 159990 468 977 1770100 513 1071 1941120 604 1260 2284140 695 1449 2626160 349 785 1638 2969180 389 876 1827 3311200 430 966 2016 3654220 470 1057 2205 3996240 510 1148 2394 4339260 550 1238 2584 4682280 591 1329 2773 5024300 631 1419 2962 5367320 671 1510 3151 5709340 711 1601 3340 6052360 752 1691 3529 6394380 792 1782 3718 6737400 832 1872 3907 7080500 1034 2326 4852 8792600 1235 2779 5797 10505700 1436 3232 6742 12218800 1638 3685 7688 13931900 1839 4138 8633 156441000 2040 4591 9578 173571100 2242 5044 10523 190701200 2443 5497 11469 207821300 2644 5950 12414 224951400 2842 6394 13340 241741500 3062 6889 143732000 4233 9525 198722500 5602 12604 26298

1 125 2272 87 182 3303 117 244 4424 147 306 5555 176 368 6676 206 430 7807 236 493 8938 266 555 10059 296 617 111810 145 326 679 123112 171 385 804 145614 198 445 928 168216 224 505 1053 190718 251 564 1177 213320 277 624 1301 235822 304 683 1426 258424 330 743 1550 280926 357 803 1675 303528 383 862 1799 326030 410 922 1924 348632 436 982 2048 371134 463 1041 2173 393736 489 1101 2297 416238 516 1161 2421 438840 542 1220 2546 461350 675 1518 3168 574160 807 1817 3790 686870 940 2115 4412 799680 1072 2413 5035 912390 1205 2711 5657 10251100 1340 3015 6290 11398110 1487 3345 6978120 1638 3685 7687130 1794 4036 8421140 1956 4401 9183150 2126 4783 9980160 2305 5186 10821170 2496 5615 11716180 2701 6077 12680190 2926 6583 13734200 3176 7146 14909

Type 459 / 462

LWN 471.58

Threaded Safety Relief Valves Spring Loaded Capacities US Units / Metric Units · AIR

Series 459

60



Capacities for air according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure at 60 °F (16 °C).Capacities at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure.

0.044 0.099 0.206 0.373Set pressure

[psig]

Capacities US UnitsOrifice [Inch2]

28.2 63.3 133 241Set pressure

[bar]

Capacities Metric UnitsOrifice [mm2]

1 168 3032 117 243 4403 157 326 5904 196 409 7405 236 492 8916 276 575 10417 316 658 11928 356 741 13429 396 825 149310 194 436 908 164312 229 516 1074 194414 265 596 1240 224616 300 676 1406 254718 336 756 1573 284820 371 836 1739 314922 407 916 1905 345024 442 996 2071 375126 478 1075 2238 405228 513 1155 2404 435330 549 1235 2570 465432 585 1315 2737 495534 620 1395 2903 525636 656 1475 3069 555738 691 1555 3235 585840 727 1635 3402 615950 904 2034 4233 766460 1082 2434 5064 917070 1259 2833 5895 1067580 1437 3233 6727 1218090 1614 3632 7558 13685100 1792 4032 8389 15190110 1969 4431 9221120 2147 4831 10052130 2325 5230 10883140 2502 5630 11715150 2680 6029 12546160 2857 6429 13377170 3035 6828 14209180 3212 7228 15040190 3390 7627 15871200 3568 8027 16702250 4455 10024300 5343 12022350 6231 14020400 7119 16017500 8894600 10670700 12446800 14221

15 100 18120 55 115 20930 70 146 26440 86 180 32650 103 213 38760 119 247 44870 135 281 50980 151 315 57090 167 348 631100 184 382 692120 216 449 814140 248 517 936160 125 281 584 1058180 139 313 652 1180200 154 346 719 1302220 168 378 787 1424240 182 410 854 1546260 197 443 921 1669280 211 475 989 1791300 226 508 1056 1913320 240 540 1124 2035340 254 572 1191 2157360 269 605 1259 2279380 283 637 1326 2401400 298 670 1393 2523500 370 832 1731 3134600 442 994 2068 3744700 514 1156 2405 4354800 586 1318 2742 4965900 658 1480 3079 55751000 730 1642 3416 61861100 802 1804 3753 67961200 874 1966 4091 74071300 946 2128 4428 80171400 1018 2290 4765 86281500 1090 2452 51022000 1450 3262 67882500 1810 4072 84733000 2170 48823500 2530 56924000 2890 65024500 3250 73135000 3610 81236000 43307000 50508000 57709000 649010000 721111000 7931

Type 459 / 462

LWN 471.59

Threaded Safety Relief Valves Spring Loaded Capacities US Units / Metric Units · WATER

61



Capacities for water according to ASME Section VIII (UV), based on set pressure plus 10 % overpressure at 68 °F (20 °C).Capacities at 30 psig (2.07 bar) and below are based on 3 psig (0.207 bar) overpressure.

0.044 0.099 0.206 0.373Set pressure

[psig]

Capacities US UnitsOrifice[Inch2]

28.2 63.3 133 241Set pressure

[bar]

Capacities Metric UnitsOrifice[mm2]

15 18.8 34.020 10.2 21.2 38.430 12.2 25.4 46.040 14.1 29.3 53.150 15.8 32.8 59.460 17.3 35.9 65.170 18.7 38.8 70.380 19.9 41.5 75.190 21.2 44.0 79.7100 22.3 46.4 84.0120 24.4 50.8 92.0140 26.4 54.9 99.4160 12.5 28.2 58.7 106180 13.3 29.9 62.3 113200 14.0 31.5 65.6 119220 14.7 33.1 68.8 125240 15.4 34.5 71.9 130260 16.0 36.0 74.8 135280 16.6 37.3 77.6 141300 17.2 38.6 80.4 146320 17.7 39.9 83.0 150340 18.3 41.1 85.6 155360 18.8 42.3 88.0 159380 19.3 43.5 90.5 164400 19.8 44.6 92.8 168500 22.2 49.9 104 188600 24.3 54.6 114 206700 26.2 59.0 123 222800 28.0 63.1 131 238900 29.7 66.9 139 2521000 31.3 70.5 147 2661100 32.9 74.0 154 2791200 34.3 77.2 161 2911300 35.7 80.4 167 3031400 37.1 83.4 174 3141500 38.4 86.4 1802000 44.3 99.7 2082500 49.6 111 2323000 54.3 1223500 58.6 1324000 62.7 1414500 66.5 1505000 70.1 1586000 76.87000 82.98000 88.69000 94.010000 99.111000 104

1 4.20 7.612 2.73 5.68 10.33 3.34 6.95 12.64 3.86 8.02 14.55 4.31 8.97 16.26 4.72 9.83 17.87 5.1 10.6 19.28 5.45 11.3 20.59 5.78 12.0 21.810 2.71 6.1 12.7 23.012 2.97 6.68 13.9 25.214 3.21 7.22 15.0 27.216 3.43 7.71 16.0 29.118 3.64 8.18 17.0 30.820 3.83 8.62 17.9 32.522 4.02 9.04 18.8 34.124 4.20 9.45 19.7 35.626 4.37 9.83 20.5 37.028 4.53 10.2 21.2 38.430 4.69 10.6 22.0 39.832 4.85 10.9 22.7 41.134 5.00 11.2 23.4 42.436 5.14 11.6 24.1 43.638 5.28 11.9 24.7 44.840 5.42 12.2 25.4 45.950 6.06 13.6 28.4 51.460 6.64 14.9 31.1 56.370 7.17 16.1 33.6 60.880 7.67 17.2 35.9 65.090 8.13 18.3 38.1 68.9100 8.57 19.3 40.1 72.7110 8.99 20.2 42.1120 9.39 21.1 44.0130 9.77 22.0 45.7140 10.1 22.8 47.5150 10.5 23.6 49.1160 10.8 24.4 50.8170 11.2 25.1 52.3180 11.5 25.9 53.8190 11.8 26.6 55.3200 12.1 27.3 56.7250 13.6 30.5300 14.8 33.4350 16.0 36.1400 17.1 38.6500 19.2600 21.0700 22.7800 24.2

Type 459 / 462

LWN 471.60

Threaded Safety Relief Valves Spring Loaded Specification Sheet

Series 459

62

Specification SheetPlease fax to: 636 326 9185

or your local representative

Company: Phone: Page: of

Location: Fax:

Name: e-mail:

Reference: Date:

GENERAL1 ■ Item No.: 9 ■ Basis of Selection: Code: ■■ ASME VIII2 ■ Tag No.: ■■ PED 97/ 23/ EC (CE-marking) ■■ Fire3 ■ Customer: ■■ Two phase flow4 ● Equipment: ■■ other:5 ● Enquiry/Order No.: 10 ■ Documentation: Material test report6 ● Delivery time: ■■ inlet body ■■ outlet body7 ● Number of valves: ■■ bonnet:8 ● Number of spare valves: ■■ other:

SIZING AND SELECTION46 ▲ Required orifice area / units:47 ▲ Selected orifice area / units:48 ▲ Coeff. of discharge:49 ▲ Calculated capacity / units:

ACCESSORIES AND OPTIONS42 ■ Lifting lever: ■■ plain H3 ■■ packed H4 ■■ cap H2 44 ● Bellows: ■■ yes ■■ no43 ● Test gag: ■■ yes ■■ no 45 ● Others (specify):

MATERIALS32 ● LESER Material Code ■■ 2: Carbon Steel ■■ 3: SG Iron ■■ 4: Stainless steel33 ● LESER Type ■■ 459 ■■ 462 38 ● Soft seat ■■ CR ■■ NBR ■■ EPDM34 ■ Inlet Body: seal: ■■ FPM ■■ FFKM ■■ other:35 ● Outlet Body: 39 ● Bellows: ■■ 316L ■■ Hastelloy®

36 ● Bonnet: ■■ Inconel® ■■ other:37 ● Disc (metal): ■■ SS hardened ■■ 316L 40 ● Spring: ■■ high temp. alloy steel ■■ carbon steel

■■ other: ■■ stainless steel ■■ other:41 ● Comply with NACE MR 0175 ■■ Yes ■■ No

VALVE CONSTRUCTION27 ● Orifice Designation:28 ● Connection inlet Connection outlet29 ● Size: Size:30 ● Thread type or Flange class: Thread type or Flange class:31 ● Facing type: ■■ RF ■■ RJ ■■ other: Facing type: ■■ RF ■■ RJ ■■ other:

SERVICE CONDITIONS11 ■ Fluid and state: ■■ Steam (S) ■■ Gas (G) ■■ Liquid (L) ■■ Two phase12 ■ Molecular weight: 20 ■ Set pressure / units:13 ● Coefficient C: 21 ● Operating pressure / units: 14 ● Ratio of specific heats k: 22 ● Cold diff. set pressure / units:15 ● Compressibility factor Z: 23 ■ Const. back pressure / units:16 ■ Spec. gravity / units: 24 ■ Var. back pressure / units:17 ● Viscosity / units: 25 ● Overpressure: ■■ 10 % ■■ ...... %18 ■ Relieving temperature / units: 26 ● Blowdown: ■■ 10 % ■■ 20 %19 ■ Required capacity / units: ■■ ...... %

■ Please fill in these fields in any case.● Please fill in these fields if possible.▲ These fields will be completed by the supplier.

4 .Order Code

Article No. Set Pressure Connections Options Documentation Code and Medium

First in safety…… a not so brief history of LESER

Type 526Type 488

Type 437

Type 441 Type 459

LESER’s factory today

LESER Headquarter1818 –1914

History

The company started in 1818 as abrass foundry and over the decadesdeveloped a product portfolio of com-ponents for mechanical equipment andmachines during the “industrial revolu-tion”. At first LESER specialized ontough applications and its level gaugesfor steam boilers were famous. Soon,the company delivered their first safetyvalve and as a consequence of quickgrowing industrialization and improvingdemand for safety, LESER rapidlybecame the specialist for safety valves.

Safe solutions from thespecialist

Today, LESER´s product range includes23 different designs with a variety ofmaterials and sizes from 1/2” to 16”,providing safe solutions for almostevery application with● Full lift safety valves● High-pressure safety valves● Safety valves according to API 526● Relief and safety relief valves● Clean service safety relief valves● Safety valves for critical service con-

ditions● Safety valves according to special

standards and regulation● Safety valves with supplementary

pneumatic load● Special versions

Where to find LESER

Headquartered in Germany, with astate-of-the-art factory and more than290 employees, LESER is presentthrough subsidiaries and qualified part-ners in over 40 countries, providingproducts and services worldwide.

For the nearest source please contactus at:

LESER LLC1664 Headland DriveFenton, MO 63026Phone: 636 - 343 - 8766Fax: 636 - 326 - 9185e-mail: [email protected]

www.leserusa.com

Compact Performance CatalogEdition July 2005

LWN 471.01-471.60 / 07.2005 / 3000

LESER LLC 1664 Headland DriveFenton, MO 63026

Phone: 636 - 343 - 8766Fax: 636 - 326 - 9185

e-mail: [email protected]

The Safety Valve

Documents

Leser Compact Performance Threaded Safety Relief · PDF fileCATALOG The Safety Valve Compact performance Threaded Safety Relief Valves Series 437 Type 437 · 438 · 439 Series 459