JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief Valve · Crosby Styles JOS-E and JLT-JOS-E are the standard conventional relief valve designs for applications when the discharge

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief Valve

Tyco reserves the right to change the content without notice AGCDR-0053-EN-0403

Technical DataSizes : 1” D 2” to 8” T2 10”Orifices : 0.110 to 27.872 in2 [71 to 17981 mm2]Inlet Ratings : ANSI Cl 150, 300, 600, 900, 1500, 2500Temperature Range : -450°F to +1000°F [-268°C to +538°C]Pressure Range : JOS-E and JLT-JOS-E: 15 to 6000 psig [1.03 to 413.79 barg]

JBS-E and JLT-JBS-E: 25 to 6000 psig [1.72 to 413.79 barg]

IntroductionCrosby® Styles JOS-E and JBS-E spring-loaded pressure relief valves have beenengineered to provide high quality over-pressure protection for air, gas, steam,vapor, liquid and two-phase applications inan exceptionally rugged, standardizeddesign to the process and powerindustries.Standard sizes are 1 D 2 to 8 T2 10 withinlet flange ratings of ANSI Cl 150, 300,600, 900, 1500 and 2500. Standard outletflanges are ANSI Cl 150 or Cl 300depending on valve size or rating. Inlet andoutlet center-to-face dimensions conformto API Standard 526, Flanged SteelPressure Relief Valves.Styles JOS-E and JBS-E pressure reliefvalves are manufactured in accordancewith ASME Pressure Vessel Code, SectionVIII and capacities are certified by theNational Board of Boiler and PressureVessel Inspectors.All Crosby pressure relief valve castingsand forgings are procured to ASME/ASTMmaterial specifications and are available ina number of material combinations such asMonel®, Hastelloy® and stainless steel. Inaddition, Styles JOS-E and JBS-E reliefvalves offer a number of special materialcombinations such as Titanium, DuplexStainless Steel and Inconel®, and areavailable on application.Dimensions of flanges conform to currentANSI Standards. All steel raised faceflanges are spiral concentric serrated finishwith 45 to 55 grooves per inch and a finishbetween 125 Ra and 200 Ra. Other flangefacings, such as Ring Type Joint, areavailable on request.For information pertaining to sizing andselection, refer to the AGC SafetySizecomputer sizing program and PressureRelief Valve Engineering Handbook(Technical Document No. TP-V300).

Notes1. Monel® and Inconel® are registered

trademarks of the International NickelCompany, Inc.

2. Hastelloy® is a registered trademark ofHaynes International, Inc.

Crosby style JOS-E and JBS-E spring loaded API-526standard pressure relief valves

www.tycovalves-eu.com


Tyco reserves the right to change the contents without notice page 2

Extended service life, reduced cost of ownership superior application versatility

• Improved, rugged nozzle ring design.• Improved disc insert retention for ease of maintenance.• Standard Inconel 625 bellows and flange material for superior corrosion resistance, longer

service life and a wider range of applications.• Universal disc holder allows for simple and cost-effective conversions from conventional to

balanced bellows design.• Standard threaded bellows design for ease of maintenance and conversion from conventional

to balanced bellows design.• Improved corrosion resistance with standard 316 stainless steel adjusting bolt locknut and

nozzle ring set screw materials.• Style JLT capacities certified on liquids and gas.• Improved parts interchangeability - regardless of top construction.• Field proven style JLT trim* for stable, non-chattering operation on liquid and gas service.• Standard chrome steel spring for -20°F to +650°F [-28°C to +343°C].• Easily converted to any type cap or lifting lever construction, liquid trim, soft-seat or balanced

bellows configurations.• Full compliance with ASME boiler and Pressure Vessel Code Section VIII and API Standards

526 and 527.

* Patented

Valve Styles

JOS-E JLT-JOS-EJBS-E JLT-JBS-EJBS-BP-E JLT-JBS-BP-EJOS-H-E

These design improvements and material upgrades, combined with state-of-the-art manufacturingfacilities, result in lower cost of ownership to end users and enhanced product availability fromCrosby factories as well as Crosby’s extensive network of pressure management centersSM .

Style JOS-E



Figure 1

Figure 2

Figure 3

Figure 4

Styles JOS-E and JBS-E product features

Bellows and top flangeCrosby Styles JBS-E and JLT-JBS-E balanced bellows pressure relief valves provide optimumvalve performance when the developed back pressure in exhaust systems or discharge manifoldsbecomes excessive.All standard JBS-E and JLT-JBS-E relief valves feature a standard bellows and top flange (Figure 1) manufactured from Inconel alloy 625 which is a fatigue-resistant material and providesimproved corrosion resistance compared to 316L stainless steel bellows. Inconel® alloy 625 ishighly resistant to pitting, crevice corrosion and intergranular attack. The standardization ofInconel® Alloy 625 bellows and top flange provides a higher degree of corrosion resistance withoutthe premium extra charge usually associated with Inconel® bellows.

Ease of maintenance and component interchangeabilityThe disc insert retention, disc holder and nozzle ring of the JOS-E and JBS-E have been re-engineered to improve maintenance, minimize spare parts and provide more component partinterchangeability. (Figure 2)The disc insert is inserted into the disc holder with a retention clip which is compressed as itpasses through the smallest diameter in the disc holder recess and then returns to its normalshape once it has passed through. With the retention clip in its original shape, the disc insert isheld securely in place.A “universal” disc holder allows for simple and cost effective conversions from conventional tobalanced bellows design as well as cost-effective bellows replacement. The bellows threads on tothe disc holder with a tailpiece and gasket.The new nozzle ring encloses the adjustment slot at the bottom of the ring giving a more rugged,durable design.

Chrome steel springStandard chrome steel spring material for applications with inlet temperatures up to 650°F[343°C].

Dual CertificationCrosby patented Style JLT (Figure 3) pressure relief valves offer a significant increase in capacity at10% overpressure resulting in the economic use of a smaller valve as well as a reduction in inletand discharge piping costs. The JLT trim is a field-proven patented design providing stable, non-chattering operation for liquid service.The JLT design is also capacity certified on gas and vapor service and can be applied in two-phase flow applications. The JLT design is a logical choice for applications where the process fluidmay be a liquid or a gas depending on the overpressure condition.

Bellows ConvertibilityThe Crosby flanged, spring operated pressure relief valve is designed and manufactured as aconventional valve and a balanced bellows valve. The conversion from conventional Styles JOS-Eor JLT-JOS-E in 1 D 2 through 8 T2 10 requires only the addition of a bellows assembly andbellows tail-piece gasket. No other parts are necessary since all other parts are completelyinterchangeable.

Seat DesignStyles JOS-E and JBS-E relief valves are available with flat metal-to-metal seats or soft seats. TheJOS-E and JBS-E two-piece disc holder/disc insert construction provides thermal balancingassuring maximum seat tightness, and meets the requirements of API Standard 527, SeatTightness of Pressure Relief Valves.Where system operating conditions permit, soft seat or elastomer seat construction is available asan option. The Crosby O-ring soft seat (Figure 4) is a two-seat design, with a metal-to-metal seatlocated downstream of the soft seat. The O-ring is the primary seal. The secondary flat metal-to-metal seat controls the compression of the O-ring and also serves as a secondary seal should theO-ring be damaged.Standard O-ring materials include Viton®1, BUNA-N, EPR2, TFE3, Silicone Rubber and Kalrez4.Pressure and temperature limits of each material are shown on page 11. Other soft seat materialssuch as Chemraz5 and Aflas6 are available on application.

Cap, Lifting Lever and Spindle InterchangeabilityAll Crosby JOS-E and JBS-E relief valves use a threaded spindle and drilled and tapped bonnetwhich permits easy cap or lifting lever conversions, with maximum standardization andinterchangeability of parts. In addition, standard cap and lifting lever designs can be used with in-line test devices.

Notes

1. Reg. U.S. Patent Office for DuPont’sfluoroelastomer.

2. EPR = Ethylene Propylene Rubber. 3. TFE = Tetrafluoroethylene.4. Reg. U.S. Patent Office for DuPont’s

perfluoroelastomer parts.5. Registered Trademark of Greene, Tweed &

Co.6. Registered Trademark of Asahi Glass

Company, Ltd.

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveStyles JOS-E and JLT-JOS-E conventional pressure relief valves


Crosby Styles JOS-E and JLT-JOS-E are the standard conventional relief valve designs forapplications when the discharge is to the atmosphere or when the discharge is to a low pressureexhaust system designed to contain the process fluid. Valves subject to flashing fluids may requirea balanced bellows type valve (see page 6).

This exceptionally rugged design features a high guiding surface ratio, corrosion resistant trim,upgraded materials of construction and several other design improvements to ensure ease ofmaintenance as well as a greater degree of parts interchangeability.

For liquid service applications, Style JLT-JOS-E relief valves provide stable operating performanceusing the widely industry recognized liquid trim design patented by Crosby. The disc holder in theliquid trim design has been engineered to allow the valve to achieve full lift at 10% overpressurewithout valve chatter.

Notes

1. Recommended Spare Part.2. Furnished with Disc Insert.3. Corrosion resistant coating.4. Crosby may upgrade to Inconel® X750.5. Class 900#, 1500# and 2500# inlet ratings

use 416 Stainless Steel.

Styles JOS-E and JLT-JOS-E standard materials of construction

Ref. No. Part Name Standard Material

1 Body (JOS-E and JLT-JOS-E ( )5 and ( )6) ASME SA216 GR. WCB1 Body (JOS-E and JLT-JOS-E ( )7) ASME SA217 GR. WC62 Nozzle 316 Stainless Steel3 Nozzle Ring 316 Stainless Steel4 Set Screw 316 Stainless Steel5 Disc Holder 316L Stainless Steel8 Disc Insert1 316 Stainless Steel9 Retention Clip2 Inconel® X75012 Retainer Screws 316 Stainless Steel11 O-ring Retainer 316 Stainless Steel10 O-ring1 Specify15 Guide ASTM A297 GR. HE SST16 Spindle 416 Stainless Steel17 Spindle Cotter Pin Stainless Steel18 Spring (JOS-E and JLT-JOS-E ( )5) Chrome Steel3

18 Spring (JOS-E and JLT-JOS-E ( )6 and ( ) 7) Alloy Steel 3,4

19 Spring Washers Carbon Steel20 Bonnet (JOS-E and JLT-JOS-E ( )5 and ( )6) ASME SA216 GR. WCB20 Bonnet (JOS-E and JLT-JOS-E ( )7) ASME SA217 GR. WC621 Bonnet Stud ASME SA193 GR. B722 Bonnet Stud Nut ASME SA194 CL 2H24 Adjusting Bolt 316 Stainless Steel5

25 Adjusting Bolt Nut 316 Stainless Steel26 Pipe Plug (Bonnet) Carbon Steel27 Set Screw Gasket1 Organic Fiber Non-Asbestos28 Guide Gasket1 Organic Fiber Non-Asbestos34 Seal and Wire Lead and Stainless Steel35 Seal Clip (Not Shown) Stainless Steel36 Nameplate (Not Shown) Stainless Steel40 Threaded Cap Carbon Steel41 Cap Gasket1 Organic Fiber Non-Asbestos

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveStyles JOS-E and JLT-JOS-E conventional pressure relief valves


40

24

25

34

19

20

18

19

21

22

15

5

34

3

4

8

27

1

2

41

26

16

17

28

29

12

11

10

Style JOS-E(with metal-to-metal seat)

Style JLT-JOS-E(with O-ring seat)

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveStyles JBS-E and JLT-JBS-E balanced bellows construction


Crosby Styles JBS-E and JLT-JBS-E are pressure relief valves incorporating a bellows which isbalanced to minimize the effect of back pressure on the performance characteristics. Thebalanced bellows design offsets the effects of variable back pressure on valve set pressure. Thebalanced bellows valve can also handle applications involving high built-up back pressure.

Additionally, the bellows serves to isolate the guide, spindle, spring and other parts contained inthe bonnet chamber from corrosive fluids or media such as a highly viscous fluid or slurry whichcould render the relief valve inoperative.

For liquid service applications, Crosby offers Style JLT-JBS-E relief valves.The standard bellows assembly of the Crosby Style JBS-E and JLT-JBS-E threads onto the discholder with a bellows tailpiece and gasket. A welded bellows attachment is available as an option.

The JBS-E and JLT-JBS-E bellows and bellows flange are supplied in Inconel 625 as standardmaterial for improved durability, corrosion resistance and service life.

Styles JBS-E and JLT-JBS-E standard materials of construction

Ref. No. Part Name Standard Material

1 Body (JBS-E and JLT-JBS-E ( )5 and ( )6) ASME SA216 GR. WCB1 Body (JBS-E and JLT-JBS-E ( )7) ASME SA217 GR. WC62 Nozzle 316 Stainless Steel3 Nozzle Ring 316 Stainless Steel4 Set Screw 316 Stainless Steel5 Disc Holder 316L Stainless Steel6C Bellows Flange1 Inconel® 6256B Bellows1 Inconel® 6256A Bellows Tailpiece1 316L Stainless Steel29 Tailpiece Gasket2 Organic Fiber Non-Asbestos8 Disc Insert2 316 Stainless Steel9 Retention Clip3 Inconel® X75012 Retainer Screws (see page 5) 316 Stainless Steel11 O-ring Retainer (see page 5) 316 Stainless Steel10 O-ring2 (see page 5) Specify15 Guide ASTM A297 GR. HE SST16 Spindle 416 Stainless Steel17 Spindle Cotter Pin Stainless Steel18 Spring (JBS-E and JLT-JBS-E ( )5) Chrome Steel4

18 Spring (JBS-E and JLT-JBS-E ( )6 and ( )7) Alloy Steel4,5

19 Spring Washers Carbon Steel20 Bonnet (JBS-E and JLT-JBS-E ( )5 and ( )6) ASME SA216 GR. WCB20 Bonnet (JBS-E and JLT-JBS-E ( )7) ASME SA217 GR. WC621 Bonnet Stud ASME SA193 GR. B722 Bonnet Stud Nut ASME SA194 CL 2H24 Adjusting Bolt 316 Stainless Steel6

25 Adjusting Bolt Nut 316 Stainless Steel27 Set Screw Gasket1 Organic Fiber Non-Asbestos28 Guide Gasket2 Organic Fiber Non-Asbestos34 Seal and Wire Lead and Stainless Steel35 Seal Clip (not shown) Stainless Steel26 Nameplate (not shown) Stainless Steel40 Threaded Cap Carbon Steel41 Cap Gasket2 Organic Fiber Non-Asbestos

Notes

1. Subassembly.2. Recommended Spare Part.3. Furnished with Disc Insert.4. Corrosion resistant coating.5. Crosby may upgrade to Inconel® X750.6. Class 900#, 1500# and 2500# inlet ratings

use 416 Stainless Steel.

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveStyles JBS-E and JLT-JBS-E balanced bellows construction


40

24

25

34

19

20

18

19

21

22

15

5

34

3

4

8

27

1

2

41

16

17

28

29

9

6C

6B

6A

Style JBS-E(with metal-to-metal seat)

NoteThis vent mustremain open onJBS-E and JLT-JBS-Econstruction



Styles JOS-E and JLT-JOS-E Conventional pressure relief valves for sour gas service per NACE MR0175

Level 1For applications where compliance with NACE MR0175 is required for wetted parts in the primary(upstream) pressure zone of the pressure relief valve. Materials of construction for Level 1 can befound on page 4 and 5.

Level 2For applications where compliance with NACE MR0175 is required for wetted parts in the primary(upstream) and secondary (downstream) pressure zones of the pressure relief valve.While the materials recommended for the Crosby Style JOS-E and JLT-JOS-E sour gas valves aresuitable for average service conditions, optional materials are available to provide additionalresistance to corrosion beyond the minimum requirements of the standard.

Material specification

Ref No. Part Name Standard NACE Material Level 2

1 Body ASME SA216 GR WCB2 Nozzle 316 Stainless Steel3 Nozzle Ring 316 Stainless Steel4 Set Screw 316 Stainless Steel5 Disc Holder 316L Stainless Steel8 Disc Insert 316 Stainless Steel9 Retention Clip Inconel® X75015 Guide ASTM A297 GR. HE SST16 Spindle 316 Stainless Steel17 Spindle Cotter Pin Stainless Steel18 Spring Inconel® X75019 Spring Washer 316 Stainless Steel20 Bonnet ASME SA216 GR WCB21 Bonnet Stud Alloy Steel122 Bonnet Stud Nut Alloy Steel124 Adjusting Bolt 316 Stainless Steel25 Adjusting Bolt Nut 316 Stainless Steel26 Pipe Plug (Bonnet) Carbon Steel27 Set Screw Gasket Organic Fiber Non-Asbestos28 Guide Gasket Organic Fiber Non-Asbestos34 Seal and Wire Lead and Stainless Steel35 Seal Clip (not shown) Stainless Steel40 Threaded Cap Carbon Steel41 Cap Gasket Organic Fiber Non-Asbestos

Bold materials indicate variation from standard product.

Notes

1. If Class I or II bolting is required, bonnetstuds will be ASME A193 Gr B7M HRC-22maximum and bonnet stud nuts will beASME A194 Class 2HM HRC-22 maximum.

Style JOS-E

40

24

25

34

19

20

18

19

21

22

15

5

34

3

4

8

27

1

2

41

26

16

17

28

29



Styles JBS-E and JLT-JBS-EBalanced bellows pressure relief valves for sour gas service per NACE MR0175

Level 1For applications where compliance with NACE MR0175 is required for wetted parts in the primary(upstream) pressure zone of the pressure relief valve. Materials of construction for Level 1 can befound on page 6 and 7.

Level 2For applications where compliance with NACE MR0175 is required for wetted parts in the primary(upstream) and secondary (downstream) pressure zones of the pressure relief valve. The Inconel®

625 bellows isolates the valve spring and other critical components above it from the processfluid.While the materials recommended for the Crosby Style JBS-E and JLT-JBS-E sour gas valves aresuitable for average service conditions, optional materials are available to provide additionalresistance to corrosion beyond the minimum requirements of the standard.

Material specification

Ref No. Part Name Standard NACE Material Level 2

1 Body ASME SA216 GR. WCB2 Nozzle 316 Stainless Steel3 Nozzle Ring 316 Stainless Steel4 Set Screw 316 Stainless Steel6C Bellows Flange1 Inconel® 6256B Bellows1 Inconel® 6256A Bellows Tailpiece1 316L Stainless Steel29 Tailpiece Gasket Organic Fiber Non-Asbestos5 Disc Holder 316L Stainless Steel8 Disc Insert 316 Stainless Steel9 Retention Clip Inconel® X75015 Guide ASTM A297 GR. HE SST16 Spindle 416 Stainless Steel17 Spindle Cotter Pin Stainless Steel18 Spring Chrome Steel-Aluminum Metallized19 Spring Washer Steel20 Bonnet ASME SA216 GR. WCB21 Bonnet Stud Alloy Steel2

22 Bonnet Stud Nut Steel2

24 Adjusting Bolt 316 Stainless Steel3

25 Adjusting Bolt Nut 316 Stainless Steel27 Set Screw Gasket Organic Fiber Non-Asbestos28 Guide Gasket Organic Fiber Non-Asbestos34 Seal and Wire Lead and Stainless Steel35 Seal Clip (not shown) Stainless Steel40 Threaded Cap Carbon Steel41 Cap Gasket Organic Fiber Non-Asbestos

Bold materials indicate variation from standard product.

Notes

1. Subassembly.2. If Class I or II bolting is required, bonnet

studs will be ASME A193 Gr B7M HRC-22maximum and bonnet stud nuts will beASME A194 Class 2HM HRC-22maximum.

3. Class 900#, 1500# and 2500# inlet ratingsuse 416 Stainless Steel.

Style JBS-E(with bellows)

40

24

25

34

19

20

18

19

21

22

15

5

34

3

4

8

27

1

2

41

16

17

28

29

9

6C

6B

6A

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveCaps and lifting levers


Threaded Cap

Type A Type J(standard)

Cap test rod

Type B - Threaded capType E - Packed lifting leverType H - Bolted capType K - Threaded cap (standard)Type M - Bolted cap (standard)

Packed lifting lever

Type D(Top view of packing gland construction

used for special materials)


Type D(Top view)


Type D

Bolted Cap

Type G Type L(standard)

Regular lifting lever

Type C

Test rod

Cap

Spindle

SpindleAdjustingbolt

Adjustingbolt nut

Seal and wire

Cap stud nut

Seal andwire

Cap

Cotter pin

Cotter pin

Lever

Lever

PackingglandDog shaftgasket

Lever nutLever nutlockwasher

Cap topgasket

Dog

O-ring

Dogshaft

Dogshaft

Pin

Lever

Cap setscrew

Cap orcap top

Spindle

Spindle

Cap

Cap gasket

Cap

Cap

Sealand wire

Cap plug

Cap stud

Spindle nut

Cap top

Spindle nut

Lever nut

Dog shaft

Packing gland sleeve

PackingPacking gland nut

Dog shaft bearing

Gasket

Lockwasher

Cap

Cap

Dog

Valvespindle

Cap stud

Cap stud nut

Forked lever

Cotter pin

Pin

Cap pluggasket

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveO-Ring soft seat materials and pressure/temperature limits


500

400

300

200

100

50

0

-150

-50

-101

-45

-17

93

204

260

15 100 200 300 400 500 600 700 800 900 1000 1200 1400

Kalrez ® (90)TFE

TFE

Kalrez ® (80)Silicone (80)Viton ® (75)TFE

Kalrez ® (90)Viton ® (90)TFE

BUNA-N (70)EPR (80)Kalrez ® (80)Silicone (70)Viton ® (75)TFE

BUNA-N (60)

EPR (70)

Silicone (50)

BUNA-N (90)EPR (90)Kalrez ® (90)Viton ® (90)TFE

BUNA-N (70)EPR (70)

Silicone (70)TFE

TFE TFE

BUNA-N (90)EPR (90)

Silicone (80)TFE

BUNA

-N (5

0)EP

R (7

0)Si

licon

e (5

0)Vi

ton

® (7

5)Ka

lrez®

(80)

Silic

one

(50)

Vito

n® (7

5)Ka

lrez®

(80)

Inle

t te

mp

erat

ure

°F

Inle

t te

mp

erat

ure

°C

Set pressure, psigFigures in ( ) are Durometer Hardness specifications

1480 or max. set pressurerating of the O-ring soft seat valve

Notes

• EPR = Ethylene Propylene RubberTFE = Tetrafluoroethylene

• Other soft seat materials are available on request. For O-ring seats below -150°F [-101°C] consult Crosby. For steam service, metal-to-metal seats are recommendedconsult Crosby if soft seats are required.

JBS-E O-RingSoft Seat

JLT-JOS-E O-RingSoft Seat

Maximum set pressure limits

Maximum Set Pressure

Orifice psig barg

D 1480 102E 1480 102F 1480 102G 1480 102H 1480 102J 1480 102K 1480 102L 1000 68.9M 1100 75.8N 1000 68.9P 1000 68.9Q 600 41.3R 300 20.6T 300 20.6T2 300 20.6



Crosby Styles JBS-E and JLT-JBS-E balanced bellows valves with supplementary back pressure balancing piston

Styles JBS-BP-E and JLT-JBS-BP-E are a modification to the Crosby bellows pressure relief valvedesigned and tested in collaboration with engineers of one of the world’s leading petroleumcompanies. This adaptation provides additional assurance of safe performance in the event ofbellows failure on installations having discharge manifold systems where back pressures (constantor variable) are present.The Crosby bellows pressure relief valve (Styles JBS-E and JLT-JBS-E) was especially developedfor service under back pressure conditions. The balanced area bellows counteracts back pressureeffects. However, in case of a broken or ruptured bellows, the valve would perform in the mannerof a standard valve without bellows. Introduction of the Supplementary Back Pressure BalancingPiston guarantees full performance characteristics of the valve until necessary replacement of thebellows can be made. This design, illustrated on the right, thus affords double protection.Unless compensated for, the effects of back pressure may cause (1) a change in the openingpressure, (2) a decrease in valve capacity, and (3) valve performance to become unstable at higherback pressure. Use of the bellows valve with supplementary balancing piston maintains thebalancing effect even after bellows failure and in such event would allow the valve to function inessentially the same manner as with the bellows intact. However, the bonnet of the valve must bevented in order to insure proper functioning of the valve. The vent also serves for a tell-tale in caseof a ruptured or broken bellows.

DesignThe auxiliary balancing piston is incorporated in the basic bellows valve,

modified to include the piston (5B) and the cylinder (17) which is part of the discholder. The guiding clearances are held to a minimum and, in addition, grooves

in the piston form a labyrinth seal to reduce flow between the piston andcylinder. Thus, in the event of a bellows failure, the leakage of fluid to

atmosphere is kept to a minimum.

Styles JBS-BP-Eand JLT-JBS-BP-E

Crosby BlockBody™ Pressure Relief Valves

Crosby’s BlockBody Pressure Relief Valves provide the solution to applications involving very highset and back pressures that exceed standard ranges.One single Crosby BlockBody Pressure Relief Valve installation can handle the capacity of multipleAPI-526 standard valves with:• Fewer potential leak• Fewer spare parts required paths• Cost savings on inlet and outlet piping

Design Details:• Full nozzle design for maximum tightness• Geometrically designed valve BlockBody and bonnet for weight savings• Interference fitted inlet studs provided• Available in orifice sizes from “D” through “T2”• Materials of construction available for special process applications• Available in Crosby Styles JOS-E, JBS-E and JLT-E valve designs

For more details please refer to datasheet AGCDR-0043.



Dimensions and Weights (carbon steel types only) Metric Units

Connection Dimensions Approx.Size & Rating mm WeightInlet x Outlet Orifice E F H X kg

1"-150 x 2”-150” D,E 104,8 114,3 502 40 161”-300 x 2”-150” * 104,8 114,3 502 40 161”-300 x 2”-150” 104,8 114,3 502 40 161”-600 x 2”-150” 104,8 114,3 502 40 161 1/2”-900 x 2”-300” 104,8 139,7 521 51 281 1/2”-1500 x 2”-300” 104,8 139,7 521 51 281 1/2”-2500 x 3”-300” 139,7 177,8 552 64 341 1/2”-150 x 2”-150” F 123,8 120,6 591 44 231 1/2”-300 x 2”-150” * 123,8 120,6 591 44 231 1/2”-300 x 2”-150” 123,8 152,4 591 44 231 1/2”-600 x 2”-150” 123,8 152,4 591 44 231 1/2”- 900 x 3”-300” 123,8 165,1 584 51 291 1/2”-1500 x 3”-300” 123,8 165,1 584 51 291 1/2”- 2500 x 3”-300” 139,7 177,8 679 64 391 1/2”-150 x 3”-150” G 123,8 120,6 591 44 231 1/2”-300 x 3”-150” * 123,8 120,6 591 44 231 1/2”-300 x 3”-150” 123,8 152,4 591 44 231 1/2”-600 x 3”-150” 123,8 152,4 591 44 271 1/2”-900 x 3”-300” 123,8 165,1 660 51 402”-1500 x 3”-300 “ 155,6 171,5 686 70 902”-2500 x 3”-300” 155,6 171,5 686 70 901 1/2”-150 x 3”-150” H 130,2 123,8 597 43 251 1/2”-300 x 3”-150” * 130,2 123,8 597 43 252”-300 x 3”-150” 130,2 123,8 597 46 272”-600 x 3”-150” 154 161,9 679 46 342”-900 x 3”-150” 154 161,9 718 59 502”-1500 x 3”-300 “ 154 161,9 718 59 502”-150 x 3”-150” J 136,5 123,8 603 43 302”-300 x 3”-150” * 136,5 123,8 603 43 303”-300 x 4”-150” 184,1 181 726 68 403”-600 x 4”-150” 184,1 181 777 68 523”-900 x 4”x 150” 184,1 171,4 826 68 643”-1500 x 4”-300” 184,1 181 826 68 703”-150 x 4”-150” K 155,6 161,9 756 54 523”-300 x 4”-150” * 155,6 161,9 756 54 523”-300 x 4”-150” 155,6 161,9 756 54 523”-600 x 4”-150” 184,1 181 838 54 733”-900 x 6”x 150” 198,4 215,9 991 68 843”-1500 x 6”-300” 196,8 215,9 991 68 883”-150 x 4”-150” L 155,6 165,1 864 51 693”-300 x 4”-150” * 155,6 165,1 864 51 694”-300 x 6”-150” 179,4 181 864 54 874”-600 x 6”-150” 179,4 203,2 895 60 1034”-900 x 6”-150” 196,8 222,2 1010 75 1224”-1500 x 6”-300” 196,8 222,2 1010 75 1224”-150 x 6”-150” M 177,8 184,1 851 54 914”-300 x 6”-150” * 177,8 184,1 851 54 914”-300 x 6”-150” 177,8 184,1 914 54 1014”-600 x 6”-150” 177,8 203,2 1067 62 1204”-900 x 6”-150” 196,8 222,2 1086 65 1324”-150 x 6”-150” N 196,8 209,5 1099 54 1184”-300 x 6”-150” * 196,8 209,5 1099 54 1184”-300 x 6”-150” 196,8 209,5 1099 54 1274”-600 x 6”-150” 196,8 222,2 1099 60 1354”-150 x 6”-150” P 181 228,6 1080 54 1224”-300 x 6”-150” * 181 228,6 1124 54 1224”-300 x 6”-150” 225,4 254 1181 54 1304”-600 x 6”-150” 225,4 254 1213 65 1826”-150 x 8”-150” Q 239,7 241,3 1213 59 2186”-300 x 8”-150” * 239,7 241,3 1213 59 2186”-300 x 8”-150” 239,7 241,3 1213 59 2236”-600 x 8”-150” 239,7 241,3 1314 75 2566”-150 x 8”-150” R 240 241 1353 59 2566”-300 x 8”-150” * 240 241 1353 59 2566”-300 x 10”-150” 240 267 1353 59 2736”-600 x 10”-150” 240 267 1353 70 2868”-150 x 10”-150” T 276,2 279,4 1511 65 4008”-300 x 10”-150” * 276,2 279,4 1511 65 4008”-300 x 10”-150” 276,2 279,4 1511 65 4098”-300 x 10”-150” 276,2 279,4 1511 65 422

H

E

F

X

Notes

1. Pressure and temperature ratings are perAPI-526.

2. Height shown “H” is for Standard Type Jthreaded Cap.

3. Pre 1995 API-526 2 1/2” Connectionsavailable for D, E, F, G and J orifice in placeof current 3” size.

* Lightweight CI 300 rating per API -526 (Cl 150 rated body).

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief ValveStyle designations


Pressure/TemperatureInlet Flange Range Ratings3 Seat TypeStyle

SizeInlet x Orifice

x Outlet

Material Variations4

Caps and LiftingLevers (Type)

1” D 2”thru8” T2 10”5

JOS-EConventional

JBS-EWith bellows

JLT-JOS-EConventional withliquid trim1

JLT-JBS-EBellows with liquidtrim1

JBS-BP-EBellows with backpressure balancingpiston

JLT-JBS-BP-EBellows with liquidtrim and backpressure balancingpiston1

JOS-H-EConventional JOSwith open bonnet forASME Code SectionVIII steam service to+800°F [+427°C]2

1 - Cl 150 Flange

2 - Cl 300 Flange (A)

3 - Cl 300 Flange

4 - Cl 600 Flange (B)

5 - Cl 900 Flange

6 - Cl 1500 Flange

7 - Cl 2500 Flange

Note (A) - LightweightCl.300 flangeper API-526

Note (B) - Except “T”orifice is Cl.300flange

* Except for Style JOS-H-E with openbonnet, chrome steelspring may be used to+800°F [+427C°]

When orderingsoft seats, specifymaterial.

2 - -450°F to -76°F[-268°C to -60°C]

4 - -75°F to -21°F[-59°C to -30°C]

5*- -20°F to +650F[-29°C to +343°C]

6 - +651°F to +800°F[+344°C to +427°C]

7 - +801°F to +1000°F[+428°C to +538°C]

None - Metal

“OR” - O-Ring

None - StandardMaterials

S - All 316 St. St.

S4 - All 316 St. St.except body,bonnet, cap andspring

M - All Monel withMonel or Inconelspring

M1 - Monel nozzleand disc insert

M4 - All Monel exceptbody, bonnet,cap, spring andwashers

M5 - All Monel exceptspring andwashers

H - All Hastelloy C

H1 - Hastelloy Cnozzle and discinsert

H4 - All Hastelloy Cexcept body,bonnet, cap,spring andwashers

H5 - All Hastelloy Cexcept springand washers

N2 - NACE Level 2

JOS-E = Inconel X750spring, 316 St. St.washers, spindle andadjusting bolt

JBS-E = Aluminum MetallizedSpring

Type J - (Standard)threaded cap

Type K - Threaded capwith test rod

Type C - Regular liftinglever6

Type D - Packed liftinglever6

Type E - Packed liftinglever with testrod6

Type L - Bolted cap

Type M - Bolted capwith test rod

Optional Caps forHeight Restricted

Applications

Type A - Threaded cap

Type B - Threaded capwith test rod

Type G - Bolted cap

Type H - Bolted capwith test rod

Available options

• Welded bellows attachment• Flange facings such as ring type joint• Sour gas service materials and certifications• Special Cl 300 outlets (where not standard)• Special Teflon®* (FEP) bellows coating• Special spring coatings or plating• Block bodies• Bonnet and cap inside painting or plastic coating• Bug screens• Special materials not cataloged• Flanges to international standards• Special flanges• Stellited nozzle and disc insert• Special casting or machined surface tests• Special cleaning• Special painting or coatings• Special testing• Steam jacketed bodies• Supplementary loading

* Reg. U.S. Patent Office for DuPont’s fluorocarbon resins.

Notes

1. Style designations “JLT-JOS-E”, “JLT-JBS-E”, or “JLT-JBS-BP-E” signify Styles JOS-E,JBS-E or JBS-BP-E with liquid trim forliquid service.

2. Upper temperature limit is +800°F [+427°C]for Style JOS-H-E open bonnet valve forASME Code Section VIII steam service.

3. See pages 14 - 43 in Catalog 310 forappropriate maximum set pressures andtemperatures.

4. See pages 12 - 13 in Catalog 310 forcomplete listings of materials ofconstruction.

5. Larger sizes are available. Ask for CatalogNo. 307.

6. ASME Code Section VIII rules require thatpressure relief valves for water service over+140°F [+60°C], steam and air shall have alifting device.

Documents

JOS-E, JBS-E,JLT-JOS-E, JLT-JBS-E Pressure Relief Valve · Crosby Styles JOS-E and JLT-JOS-E are the standard conventional relief valve designs for applications when the discharge