Fainger Leser R2 2007 FL549 · FAINGER LESER April 2006 1 2 /0 ... Sizing calculations are according to DIN 3320 / TRD 421, AD -Merkblatt 2000 - A2, ISO 4126 or ASME Sec. VIII Div

Index

SECTION DESCRIPTION PAGE No.LISTNo.

GENERAL INFORMATION

Method of Model Numbering

General Arrangement & Assembly Drawing

Standard Materials

Overall Dimensions

Discharge Capacities

Accessories

Instructions for Installation


General Arrangement Drawing

Standard Materials

Overall Dimensions


Accessories


1

2

3

4

5

6

7

1

2

3

4

5

6

7

2/01

2/02, 2/03

2/04

2/05

2/06, 2/07, 2/08

2/09 to 2/12

2/13 to 2/16

3/01

3/02

3/03

3/04

3/05, 3/06

Refer to 2/09 to 2/12

Refer to 2/13, 2/14, 2/15

VALVE TYPE FL 441 (STANDARD PRESSURE SERIES)

VALVE TYPE FL 441 (HIGH PRESSURE SERIES)

3

2

1

FAINGER LESER April 2006

1

2

1/01, 1/02

1/03

General Information

Selection of Valve Types



Standard Materials


Overall Dimensions

Accessories


1

2

3

4

5

6

7

4/01

4/02, 4/03

4/04,

4/05

4/05

Refer to 6/09, 6/10

Refer to 2/13, 2/14, 2/15

VALVE TYPE FL 459 SERIES

4

I

Index

SECTION DESCRIPTION PAGE No.LISTNo.



Standard Materials

Overall Dimensions


Accessories


1

2

3

4

5

6

7

6/01

6/02, 6/03, 6/04

6/05

6/06

6/07

6/09, 6/10

Refer to 2/13, 2/14, 2/15


6


Sizing Calculations Acc. to AD-Merkblatt 2000-A2, ISO 4126

Sizing Calculations Acc. to ASME Sec. VIII, Div. 1/API RP 520

Sizing Calculations Acc. to IBR 1950

Standard Specification Sheet

1

2

3

4

7/01

7/02, to 7/06

7/07

7/08

SIZING OF SAFETY VALVES

7

II



Standard Materials

Overall Dimensions



1

2

3

4

5

6

5/01

5/02, 5/03

5/04,

5/01

5/05

Refer to 2/13, 2/14 & 2/16


5

8/01 to 8/06

APPROVALS

89/01 to 9/02

CAPACITY TESTING FACILITY

910/01 to 10/04

LESER AT A GLANCE

10

FL 549

6

CONSTRUCTION TYPE

C - CONVENTIONAL O - OTHER, TO SPECIFY

SPRING MATERIAL

0 - OTHER, TO SPECIFY 1 - CS CD. PLATED 4 - STAINLESS STEEL

STANDARD ACCESSORIES

0 - OTHER, TO SPECIFY 2 - CLOSED, SCREWED CAP 4 - PACKED LEVER CAP

19 C S4 2 2 4 X34

0 - OTHER, TO SPECIFY1 - OPEN BONNET2 - JACKETED TYPE3 - TEST GAG4 - 'O' RING DISC6 - STELLITED INLET (SEAT) & DISC8 - DRAIN PLUG

SPECIAL FEATURES/EXTRA ACCESSORIES 'X' FOLLOWED BY THE FOLLOWING NOS.

A - ANSI 150 #B - ANSI 300 #C - ANSI 600 #D - ANSI 900 #E - ANSI 1500 #F - ANSI 2500 #0 - OTHER, TO SPECIFYS - SCREWED1 - PN 102 - PN 163 - PN 254 - PN 405 - PN 646 - PN 1007 - PN 160

MODEL No.19/CS44224X3

MATERIAL TYPEORIFICE

DESIGNATION

040607081119203031

C4 - CS, ASTM A 216 WCB(SS 304 TRIM)

C6 - CS, ASTM A 216 WCB(SS 316 TRIM)

S4 - SS, ASTM A 351 CF 8(SS 304 TRIM)

S5 - SS, ASTM A 351 CF 8(SS 316 TRIM)

S6 - SS, ASTM A 351 CF 8M (SS 316 TRIM)

4L - SS, ASTM A 351 CF 3(SS 304L TRIM)

6L - SS, ASTM A 351CF 3M(SS 316 L TRIM)

00 - OTHER, TO SPECIFY HS - ASTM A 217 GR. WC6

(SS 316 TRIM)LS - ASTM A 352 GR. LCB

(SS 316 TRIM)AY - ALLOY - 20

(ALLOY - 20 TRIM)HY - HASTELLOY - 'C'

(HASTELLOY- 'C' TRIM)SP - SPECIAL

FLF - 549 is for Flanged type and FLS - 549 is for Screwed type construction.

Valves manufactured by FAINGER LESER are based on DIN design. Relieving capacity of the selected valve would meet the customer required capacity. Sizing calculations are according to DIN 3320 / TRD 421, AD-Merkblatt 2000 - A2, ISO 4126 or ASME Sec. VIII Div. 1 / API RP 520, where applicable. These valves are approved by the CCoE (Chief Controller of Explosives), Nagpur.

FAINGER LESER Valves are tested for seat leakage according to API 527.

PROCEDURE FOR VALVE SIZING & SELECTION

6/01FAINGER LESER April 2006

/

CONNECTION RATINGFOR INLET & OUTLET

NOTE

Method of Model NumberingFor Valve Type FL 549 Series

Note:For Flow dia 12.5mm,the model No. wouldread as 12/.....

FLOW DIA08

12.516

FL 549

6Safety Valve with Packed Lever Cap, H4(Screwed Type FLS-549)

6/02 FAINGER LESER April 2006

~ H

b

ca

a +

c

46

74

43

12

75

16

9

54

14

60

8

2

7

60

1

61

57

45

44

41

86

85

19

18

59

Safety Valve with Packed Lever Cap, H4(Flanged Type FLF-549)

FL 549

6


H~

e

d

60

1

48

61

57

7

2

8

14

9

54

16

75

12

43

74

60

59

18

19

86

85

41

44

45

46

FL 549

6

6/04 FAINGER LESER April 2006

Assembly of a Spring Loaded Safety Valve

18

85

86

9

60

8

60

2

61

1

7

57

14

16

42

75

2*

4*

41

44

9043

8380

4579

75

19

Inlet BodyOutlet ChamberDisc Compl.Spindle GuideBonnetSpindleSplit RingSpring PlateAdjusting ScrewLock NutName PlateSpringPinSecuring RingGasketBall

12789

1214161819505457596061

1*= Basic valve assemblyfitted with 2*and 4*

Cap H2SpacerLead SealSeal Wire

Lever Cover H4Lever H4Lifting ForkShaftSpindle CapPinSpacer‘O’ ring

CirclipLead SealSeal Wire

42758586

414344454674757980838586

2 * = Cap H2, gastightno lifting gear

4*= Lifting Gear H4,gastight construction

Part NameItem

1*

2*

4*

46

16

74

12

54

59

50

Supporting Ring/Gland

Note: The above material is for standard construction. Suitable material to be used for corrosion resistant/special application.

-60

-76

-10

14

200

392

300

572

540

1000

DIN 1.4310 (SS)

DIN 1.8159 (ALLOY STEEL)

DIN 1.1200 (CS)

-268

-268

-450

-450

-102

-151

-29

-21

427

800

540

10000F

0F

0C

0C

ASTM A 351 CF 8/8M

ASTM A 352 LCB ASTM A 216 WCB

ASTM A 217 WC6

TEMPERATURE Vs. MATERIAL OF CONSTRUCTION

SPRING

BODY

FL 549

6Standard Materials

6/05

STANDARD MATERIAL (Also Refer to Method of Model Numbering for Details)

C41 / C61 S44 / S54 / S64 SPECIAL-1PART NAMETYPE

PARTNo.

C L

O S

E D

C

A P,

H

2PA

CKED

LE

VER

, H

4

1

2

7

8

9

12

14

16

18

19

42

48

54

57

59

60

61

75

85

86

43

44

45

46

74

80

82

INLET BODY

OUTLET CHAMBER

DISC

SPINDLE GUIDE

BONNET

SPINDLE

SPLIT RING

SPRING PLATE

ADJUSTING SCREW

LOCK NUT

CAP (41)

INLET FLANGE

SPRING

ROLL PIN

SECURING RING

GASKET

BALL

SPACER

LEAD SEAL

SEAL WIRE

LEVER

LIFTING FORK

LEVER SHAFT

SPINDLE CAP

PIN

GLAND

HEX. NUT

AISI 304/316

A 216 Gr. WCB

AISI 304/316

AISI 304/316

A 216 Gr. WCB

AISI 304/316

AISI 304/316

CS CD. PLATED

AISI 304/316

AISI 304/316

A 216 Gr. WCB

CS

CS CD. PLATED

SS

SS

C.A.F. / NON ASB.

SS

C.A.F. / NON ASB.

LEAD

MS

CS

SS

AISI 304/316

AISI 304/316

SS

CS

CS

AISI 304/316

A 351 Gr. CF 8/8M

AISI 304/316

AISI 304/316

A 351 Gr. CF 8/8M

AISI 304/316

AISI 304/316

AISI 304/316

AISI 304/316

AISI 304/316

A 351 Gr. CF 8/8M

AISI 304/316

SS

SS

SS

C.A.F. / NON ASB.

SS

C.A.F. / NON ASB.

LEAD

MS

CS

SS

AISI 304/316

AISI 304/316

SS

AISI 304/316

SS

HASTELLOY-C/MONEL

A 351 Gr. CF 8M

HASTELLOY-C/MONEL

AISI 316

A 351 Gr. CF 8M

AISI 316

AISI 316

AISI 316

AISI 316

AISI 316

A 351 Gr. CF 8M

AISI 316

SS

SS

SS

C.A.F. / NON ASB. / PTFE

SS

C.A.F. / NON ASB. / PTFE

LEAD

MS

CS

SS

AISI 316

AISI 316

SS

AISI 316

SS

Material of construction will vary according to the service conditions and customer requirement. Other special materials, for example, Monel,Alloy-20, CF 3, CF 3M and accessories such as Test Gag, Heating Jacket, Drain Plug, Soft Seat (O-Ring) Disc etc.. can be provided on request.


NOTE

@ The flow Dia 'do' shall be 8.0mm for set pressure above 113.0 bar g while using C.S. Spring and 95.0 bar g while using S.S. Spring. * Outlet size of 25 mm is standard, however, 20 mm can also be provided on request for flow Dia, 8.0mm

Special sizes & connections or different center to face dimensions etc. can also be provided on request.

6/06

Overall dimensionsFL 549

6FLANGED TYPE (FLF-549 Series)

SCREWED TYPE (FLS-549 Series)


Sl.No.

Inlet

mm

Inletd

mm

Outlet

mm

Outlete

mm

Height(approx)

Hmm

WeightApprox.

kgs.

Flow dia“do”mm

Dia.“d”mmsq. in. sq. mm

1

2

3

4

5

6

7

8

9

15

20

25

25

25

25

25

40

40

25*

25

25

25

40

40

50

40

50

300

300

300

300

300

310

310

310

310

90

90

90

90

90

95

95

95

95

80

80

80

80

80

114

114

114

124

3.0

3.0

3.5

3.5

4.0

5.0

5.5

5.5

6.0

04

06

07

08

11

19

20

30

31

0.04

0.06

0.06

0.11

0.11

0.196

0.196

0.307

0.307

5.73

7.02

7.02

9.51

9.51

12.69

12.69

15.88

15.88

Size Center to face

25.80

38.70

38.7

71.00

71.00

126.45

126.45

198.06

198.06

Orifice Details

AreaDesig-nation

Sl.No.

Inlet

mm

Inleta + cmm

Outlet

mm

Outletb

mm

Height(approx)

Hmm

WeightApprox.

kgs.

Flow dia“do”

mm

Dia.“d”mmsq. in. sq. mm

1

2

3

4

5

6

7

8

15

20

25

25

25

25

40

40

25*

25

25

25

40

50

40

50

290

290

290

290

300

300

300

300

81

81

81

81

83

83

85

85

50

50

50

50

60

80

60

80

2.0

2.0

2.0

2.0

3.0

3.0

3.5

4.0

04

06

07

08

19

20

30

31

0.04

0.06

0.06

0.11

0.196

0.196

0.307

0.307

5.73

7.02

7.02

9.51

12.69

12.69

15.88

15.88

12.5

12.5

12.5

12.5

16

16

16

16

Size Center to face

25.80

38.70

38.7

71.0

126.45

126.45

198.06

198.06

Orifice Details

AreaDesig-nation

NOTE

12.5

12.5

12.5

12.5

12.5

16

16

16

16

@

@

@

@

@

@

Discharge Capacities 6FL 549

Calculation of mass flow according to AD-Merkblatt 2000 - A2, ISO 4126 I- Saturated Steam kg/h • II - Air at 0° C (32° F) and 1013,25 mbar absolute (scm/h) • III - Water at 20° C (68° F) m³/h(10³ kg/h)


do 8 12,5 16 do 8 12,5 16 do 8

p(barg) I II I II III I II III p(barg) I II I II III I II III p(barg) II

0,5 25 30 61 72 2,6 99 118 4,3 42 867 1185 2118 2893 24,2 3471 4741 39,7 125 3473

0,75 32 39 77 96 3,2 127 157 5,3 44 907 1240 2218 3028 24,8 3638 4961 40,7 130 3610

1 38 48 93 117 3,7 153 192 6,1 46 948 1295 2318 3162 25,4 3790 5182 41,6 135 3748

1,5 50 63 123 155 4,5 201 253 7,5 48 989 1350 2415 3297 25,9 3957 5402 42,5 140 3886

2 62 79 152 193 5,2 249 316 8,6 50 1028 1405 2510 3432 26,4 4113 5623 43,3 145 4024

3 85 108 206 264 6,4 338 433 10,6 52 1068 1460 2609 3566 27,0 4275 5843 44,2 150 4162

4 105 137 257 336 7,4 422 551 12,2 54 1120 1516 2735 3701 27,5 4481 6064 45,0 160 4437

5 126 165 307 403 8,3 504 661 13,7 56 1141 1571 2785 3835 28,0 4564 6284 45,9 170 4713

6 146 192 357 471 9,1 585 771 15,0 58 1194 1626 2916 3970 28,5 4777 6505 46,7 180 4989

7 166 220 406 538 9,9 666 882 16,2 60 1234 1681 3013 4105 29,0 4936 6725 47,5 190 5264

8 186 248 456 605 10,5 747 992 17,3 62 1276 1736 3116 4239 29,4 5105 6946 48,3 200 5540

9 207 275 505 672 11,2 828 1102 18,4 64 1318 1791 3219 4374 29,9 5275 7166 49,0 210 5816

10 227 303 554 740 11,8 909 1212 19,4 66 1367 1846 3337 4508 30,4 5468 7387 49,8 220 6091

12 267 358 653 874 12,9 1070 1433 21,2 68 1406 1901 3433 4643 30,8 5625 7607 50,5 230 6367

14 307 413 750 1009 14,0 1229 1653 22,9 70 1445 1957 3528 4778 31,3 240 6643

16 347 468 848 1144 14,9 1389 1874 24,5 72 1487 2012 3632 4912 31,7 250 6918

18 387 523 945 1278 15,8 1549 2094 26,0 74 1529 2067 3733 5047 32,2

20 427 578 1043 1413 16,7 1708 2315 27,4 76 1574 2122 3844 5181 32,6

22 466 633 1139 1547 17,5 1866 2535 28,7 78 1625 2177 3968 5316 33,0

24 506 689 1237 1682 18,3 2027 2756 30,0 80 1654 2232 4039 5450 33,4

26 547 744 1336 1816 19,0 2189 2976 31,2 85 2370 5787 34,5

28 586 799 1432 1951 19,8 2347 3197 32,4 90 2508 6123 35,5

30 626 854 1529 2086 20,5 2506 3417 33,6 95 2646 6460 36,5

32 667 909 1628 2220 21,1 2668 3638 34,7 100 2784 6796 37,4

34 705 964 1723 2355 21,8 2823 3859 35,7 105 2921 7133 38,3

36 746 1019 1821 2489 22,4 2984 4079 36,8 110 3059 7469 39,2

38 785 1075 1918 2624 23,0 3142 4300 37,8 115 3197

40 826 1130 2018 2759 23,6 3306 4520 38,8 120 3335

1. Safety Valves with Heating JacketSafety Valve can be fitted with a heating jacket for special applications. Areas of application are systems to be protected

from media, which are viscous, sticky or have tendency to crystallize out of solution.

Outlet Chamber, item 2, is fitted with heating jacket.The heating connections of these Safety Valves shall be 3/8” NPT female

6/09

FL 549

6Accessories

Type 5490Heating connections turned at 90 as shown above

G

GA

R

R

C

C

Arrangement of heatingconnections for Type 549


FL 549

6

6/10

2. Safety Valves with Test Gag

3. Safety Valves with Lift Stopper

In order to allow the adjustment of each Safety Valve in a plant provided with several Safety Valves or to carry out a pressure test above the allowable operating pressure a test gag is required. The test gag is fitted in the lever cover and exerts force ontop of the spindle. After testing the test gag shall be removed.

That Safety Valves are only available in standardized nominal diameters, the valve could in a given application be oversized.It is therefore recommended to reduce the lift by means of a lift stopper, thus reducing the coefficient of discharge in addition.

Accessories

Lift limitation by gag


Instructions for the Treatment and Installation ofPressure Relief Valves.

1. General NotesPressure Relief Valves are highly quality instruments which should be handled with great care. To ensure the correct performance of a pressure relief valve all parts are made with exact precision. Only this precision ensures the correct functioning of the pressure relief valves. Careless handling of the finished valve in workshops, stores, during transportation or installation could cause leakage or possibly permanent damage (also refer to API Report Guide for inspection of refinery equipment, Chapt. XVI Pressure Relieving Devices" Para 1603082 and 1603083).

The sealing surfaces have been ground and lapped with high precision to ensure the required tightness. Even though the surfaces are extremely hard, the seal can still be damaged. By all means, one must take care to prevent impurities from entering the valve during transportation, installation and operation.

When installing pressure relief valves with threaded connections, use only metal seal washers. Seal materials such as hemp or PTFE tape should not be used as this type of material can break off and enter the valve causing it to leak.

If valves with open bonnets and/or levers are to be painted after despatch from the factory, care must be taken to protect the sliding parts. Otherwise the correct operation of the pressure relief valve may be affected.

2. Transport ProtectionThe inlet and outlet of the pressure relief safety valves are protected during transportation with plastic caps. These caps should only be removed just before installing the valve.

The lifting lever of spring loaded pressure relief valves is secured with a wire to the bonnet. This wire should be removed only after installation. For testing the set pressure or tightness of the pressure relief valve remove also this wire and take care that the lever is not engaged with the spindle cap.

3. Installation/Assembly

3.1 General NotesSpring loaded pressure relief valves should be

installed with the bonnet VERTICALLY UPWARDS.

Furthermore, pressure relief valves should be mounted in such a way that no inadmissible static, dynamic or thermal loads can be transmitted to the valve due to up and downstream pipe work. If necessary, expansion possibilities should be provided. Stresses by incorrect mounting should be avoided.

3.2 Draining of CondensateTo prevent dirt and all kinds of impurities from the pressure relief valve the drainage of discharge pipe

According to rules a drain hole of sufficient size must be incorporated at the lowest point of pipe work. In all

cases the discharge pipe must first slope in a downwards direction and fitted with a suitable size drain hole before any bends are connected (refer to sketch).

Exception:In special cases, for instance on board of ships an optional drain hole may be recommended in the valve body as it may be that pipe work drainage cannot be guaranteed at a lower point than the valve. The standard drain hole which will then be supplied by the factory is 1/4" BSP. But, by all means, the discharge pipe must be drained too. In extreme cases this hole can be drilled outside of our factory provided that special care is taken to ensure that no damage is done to the sealing surfaces.

All drainage pipes that have been connected must be free of restriction and the ends easily seen. Care must be taken when discharging any drainage to prevent injury to personnel. For example on steam connect a suitable steam trap.

Note!When valves are supplied with a drain hole that is not going to be used the plastic plug fitted in the hole must be removed and replaced by a metal plug.

3.3 Mounting BracketsFor pressure relief valves with mounting brackets a fastening possibility for the brackets should be

provided to withstand the forces of reaction when valve blows off. The bracket holes can be drilled on request.

3.4 InsulationIn case any insulation of the pressure relief valve is provided, the bonnet must be kept free to avoid

unacceptable heating up of the spring.

3.5 Inlet Pipe The inlet pipe for pressure relief valves should be as short as possible and should be so arranged, that

when the valve is in its fully open position the pressure drop must not exceed 3% of set pressure, the edging at the inlet pipe should be rounded off or at least be

chamfered.

If the calculation results in a higher than 3% pressure drop of set pressure then the inlet pipe size must be enlarged.

3.6 Discharge Pipes/Back PressureThe discharge piping on vapours and gases should

be installed in an ascending direction, on liquids in an

2/13

FL 441

2


The discharge pipework of all pressure relief valves

should be so arranged that the back pressure, which

is built up during blow off, does not exceed a max.

15% of set pressure.

In case of higher back pressure, pressure relief valves

with pressure compensating metal bellows

(balanced type) shall be used. In case the back

pressure is >0.15 times set pressure the capacity of

the pressure relief valves must be recalculated.

3.7 Pressure Relief Valves with bellowsPressure relief valves with elastomer bellows (TRD 721)

as well as metal bellows have a vent hole in the

bonnet.

When fitting pressure relief valve with a vent hole care

must be taken to prevent moisture from entering the

bonnet. However, fluid escaping from the vent hole

indicates that the bellows have failed. Repair is

required.

When pressure relief valves with bellows are used with

toxic or inflammable fluids, care must be taken to fit a

suitable vent pipe to provide safe venting. For this

purpose, the vent can be threaded 1/4" BSP female

on request.

4. Mode of Operation/MaintenanceThe working pressure of the plant should be at least 5% below

the blow down pressure of the valve to enable a correct

reseat. When a slight leakage occurs, due to deposits

between the sealing surfaces, surfaces can be cleaned by

operating the lifting lever causing the valve to blow off.

The valve should be closed by sudden release of the lever. If

this procedure does not stop the leakage, the valve seals are

probably damaged. Repairs should be carried out at our

It is recommended and in Germany required by Rules to lift manually the valve lifting lever from time to time in order to prevent accumulation of deposits that will affect valve operation. For steam generators, the following requirements are established in the German Technical Rules for Steam Boilers TRD 601, edition 6.83, Section 6.

"Testing of pressure relief valves is required for plants operating with demineralized water and for hot water generators at intervals of at least 6 months, with the exception of power plants. For other steam generators, the test interval should not exceed 4 weeks".

It is important to ensure that the lifting lever does not engage the spindle cap after the lift operation. The lever must be deflected towards the center line of the bonnet until the lifting fork is disengaged.

For pressure relief valves with open bonnet, a drain groove is provided in the guide flange. Whilst blowing, condensate escaping through the clearance between guide disc and spindle is drained through this groove.

According to DIN specification 4754, Oct. 74 Edition "Explanations", Para 4.4 pressure relief valves represent the last step in the line of protection for the vessel, and they should be able to prevent excess pressure when all other automatic or pilot operated checking instruments have failed. To guarantee this function pressure relief valves require, like all other technical equipment, regular service. How often a valve must be checked, depends on the actual operating conditions, so that no general indications can be given. Usually pressure relief valves operating in a corrosive atmosphere or on laden fluids require service more often than valves operating clean conditions. This also applies if the pressure relief valve operates frequently causing a higher wear out to the seat and disc.

Special consideration is required if conditions such as vibration (to be avoided, if possible) pressure pulsation and/or

2/14

Instructions for the Treatment and Installation ofPressure Relief Valves.

FL 441

2

Add, drain pipe in case ofprepared drain hole


1. Loosen the existing lead seal.

2. Press the lever (43) towards the middle until it reaches

the stop so that the lifting fork(44) no longer holds the

spindle cap (46).

3. Loosen and remove the lever cover (41).

4. Loosen the spindle cap (46) from the spindle (12),

remove the securing ring (91) and the pin (74).

5. Loosen the lock nut (19) of the adjusting screw (18).

6. Turn the adjusting screw (18) anticlockwise to remove

the all spring tension.

7. Remove the hex. nuts (56) from the flange of the

bonnet (9).

8. Lift off the bonnet (9).

9. Remove the upper spring plate (16).

10. Lift of the spring (54) and remove lower spring plate

(16) and split rings (14).

11. Remove spindle (12) with guide (8) and disc (7).

12. Carefully clean seat (5) and disc (7), and if required

body internals.

13. Refit spindle (12) with guide (8) and disc (7).

14. Fit the split rings (14) into spindle groove and retain

with the securing ring (59); slip on lower spring plate

(16) to locate on split rings (14).

15. Replace spring (54).

16. Slip on the upper spring plate (16) onto the spindle

(12).

17. Align adjusting screw (18), and bonnet (9), over the

spindle (12) and refit.

18. Fit and tighten the hex. nuts (56).

19. Load the spring (54) to obtain the required set

pressure. Clockwise rotation of adjusting screw (18)

increases pressure. Anticlockwise rotation of adjusting

screw (18) reduces pressure.

20. Tighten the lock nut (19) onto the adjusting screw (18).

21. Refit and secure spindle cap (46) by pin (74) and

securing (91).

22. Screw-on the lever cover (41).

23. Pull the lever (43) towards the middle so that the lifting

fork (44) is pushed under the spindle cap (46).

24. Test spindle will lift correctly by pulling lever.

These instructions are applicable for Relief Valves,

2/15

Dismantling and Assembly InstructionsFor Valve Type FL 441, FL 459 & FL 549 Series

FL 441

2

44

41

43

18

19


During all work the spindle has to be secured against twisting in order to prevent damage to the sealing surfaces.

CAUTION

Documents

Fainger Leser R2 2007 FL549 · FAINGER LESER April 2006 1 2 /0 ... Sizing calculations are according to DIN 3320 / TRD 421, AD -Merkblatt 2000 - A2, ISO 4126 or ASME Sec. VIII Div