Pressure & Flame Protection

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‘ W B ’ S E R I E S S P R I N G L O A D E D S A F E T Y R E L I E F VA LV E S

The WB is designed to safely relieve excess pressure in pumps, pipework, tanks, calorifiers, gas and oil

separators and other process vessels. It is suitable for gas, steam, vapour and liquid applications. The WB conforms to API 526 pressure/temperature ranges, orifice areas and dimensions.

‘ S A F E F L O ’ S A F E T Y A N D T H E R M A L R E L I E F VA LV E S

Safeflo valves are designed for similar duties to the WB but for small capacity applications.They safely relieve thermal expansion of process fluids in vessels and long lengths of pipework, and are suitable for gas and liquid applications.

‘ S A F E S E T ’ P I L O T O P E R AT E D S A F E T Y R E L I E F VA LV E S

Safeset valves are self contained pilot operated safety relief valves which use the system pressure to control the valve opening and closing. No other source of

S a f e t y R e l i e f V a l v e s

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P a g e B i r k e t t R a n g e 3 Introduction

4 International approvals and authorisations

5 WB Series

6 Features and benefits 7 - 10 Valve types and action 11 - 14 Drawings

15 - 16 Accessories

17 Figure numbering system 18 Material temperature ranges 19 - 46 Valve selection charts, D to T 47 - 48 Valve adjustment

49 - 50 Seat tightness/seat leakage testing

51 Safeflo

52 Features and benefits 53 - 54 Drawings

55 Accessories

56 Figure numbering system 57 - 58 Dimensions

59 Safeset

60 Features and benefits

61 Dual Outlet/Full Bore Pilot Valve 62 Pilot types and basic operation 63 - 64 Type 2 - Pop Action Pilot

65 - 68 Type 4 and 8 - Modulating Action Pilot 69 Technical specification

69 - 70 Drawings and materials of construction 71 - 75 Accessories

76 Figure numbering system 77 - 78 Dimensions

79 - 80 Operating pressure/temperature limits

P a g e Sizing 81 - 82 Sizing formula 83 Nomenclature

84 Back pressure/blowdown limits and orifice areas 85 - 90 Sizing factors 91 - 96 Capacity charts 97 Reaction forces 98 Definitions 98 Definitions of terms 99 Operational characteristics 100 Pressure term relationships

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The effects of exceeding safe pressure levels in an unprotected pressure vessel or system can have catastrophic effects on both plant and personnel. Safety relief valves should be used to protect any pressurised system from the effects of exceeding its design pressure limit.

A safety relief valve is designed to automatically discharge gas, steam, vapour or liquid from any pressure containing system, preventing a

predetermined safe pressure being exceeded, and protecting plant and personnel.

The Birkett range of safety relief valves contains three distinct valve types:

WB Series – spring loaded safety relief valves. Safeflo – safety and thermal relief valves. Safeset – pilot operated safety relief valves.

All types are certified in accordance with ASME Code Section VIII.

All Birkett valves are available through our global agent distribution network supported by our own regional sales offices around the world.

I N T R O D U C T I O N

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APPLICABLE STANDARDS ISO 9001:2008

Quality Standard

ASME Code Section VIII

All valves are UV certified

API 520 : Part 1

Sizing and selection

API 526 Dimensions API 527 Leakage Rates ANSI B16.5 Flange Ratings

Our approvals and accreditations include ISO 9001:2008, ASME, Chinese Safety Quality Licence, TUV, Bureau Veritas,

Stoomwezen, PED, ATEX and GOST-R.

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W B S e r i e s

-S p r i n g l o a d e d s a f e t y r e l i e f v a l v e

1 Insitu testing

2 Accessories

3 High performance springs

4 Bellows back up piston (not shown)

6 Bellows (not shown)

7 Trim

8 Seat integrity

9 Adjustable blow down

10 Nozzle design

11 API 526 face to face dimensions

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Design verification – all design options and the

various effects of system conditions, back pressure etc. have been verified on Birkett’s

in-house, extensive mass flow test facility.

Lighter and more compact construction –

continuous design improvements have created smaller and lighter valves to support current industry design trends, especially space and weight savings.

Interchangeable parts – valves can be modified

from type to type, gas, liquid, conventional and bellows simply by changing only a few parts.

Simplified maintenance and service

-re-engineering has reduced the number of parts, making maintenance easier and more cost effective.

Material selection – a wide range of materials

are offered including non-ferrous for low

temperature and oxygen service, as well as exotic alloys specifically for the chemical and process industries.

Cryogenic and oxygen service – Birkett’s

state-of-the-art clean room and vapour degreasing facilities ensure compliance with the stringent demands of cryogenic and oxygen applications.

1 In-situ testing – valves can be supplied

suitable for application of “in-situ” set pressure verification devices.

2 Wide range of accessories – available to

comply with international codes and to suit system requirements.

3 High performance springs – safety relief

valve springs are specifically designed to guarantee set point repeatability.

4 Bellows back-up piston – an optional

auxiliary back-up piston for balanced bellows valves ensures fail-safe operation in the event of bellows failure (see page 16).

5 Guiding surfaces – the material selection of

guiding components, together with a self-aligning disc and spindle pivot point, ensures correct alignment and no galling of guiding surfaces.

6 Bellows – ensures correct valve

performance under difficult back pressure conditions (see page 12).

7 Trim – specific gas and liquid trim designs

give stable operation and eliminate the damaging effect of chatter.

8 Seat leakage integrity – choice of nozzle

and disc materials (coupled with superior lapping techniques) provides seat tightness to API 527/ASME VIII.

9 Adjustable blow down – the valve

reseating pressure (blow down) can be simply adjusted to suit special or specific

performance requirements.

10 Nozzle design – the method and location of

attachment to the body avoids transmission of pipe stresses to the nozzle/disc mating surfaces.

11 API 526 dimensions – standardised

dimensions allows pipework layouts to be detailed confidently.

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Liquid service

Valves operating on liquid service require a modified valve design to cope with the differing dynamics of liquid flow.

A contoured plug disc is used to minimise initial flow rate, eliminating any potential inlet pressure drops due to excessive valve lift. The valve will simmer until sufficient pressure is available to generate lift. Once this has occurred, the lift will stabilise to suit the flow and pressure conditions required, thus avoiding the problem of chatter. ‘Chatter’ is the rapid opening and closing of the valve which can have a damaging effect on the disc and nozzle, causing it to leak.

Typical liquid relief valve disc There are four basic types of WB Series safety

relief valve:

WB400 – conventional gas type. WB300 – bellows gas type. WB200 – conventional liquid type. WB100 – bellows liquid type.

Conventional safety relief valves:

Can be used on systems where the discharge is relatively simple. The pressure in the discharge system can be atmospheric, at a constant level or where the pressure may build up to a maximum of 10% of the set pressure. When a constant back pressure exists, the valve should be set at the differential pressure (refer to page 8).

Bellows safety relief valves:

The WB Bellows Valves are statically balanced and can be used on more complex discharge systems such as common discharge manifolds and flares where several valves may discharge. This type of system creates a variable superimposed back pressure. The balanced bellows unit cancels out the effects of variable back pressure, on the set pressure of the safety relief valve.

Gas and vapour service:

The gas/vapour disc can be distinguished by the flat underside, unlike the cone profile of the liquid disc.

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The configuration of a closed discharge pipework system, typically for toxic or hazardous duty, can generate back pressure. Back pressure applied to the outlet of the valve will adversely affect its performance, unless it is addressed.

Back pressure may take three forms:

1. Superimposed constant back pressure

This exists permanently and a conventional or bellows valve can be used. A conventional valve can be set at the differential pressure so that the spring load is adjusted to take account of the back pressure.

2. Built up back pressure

Built up back pressure is created by the

configuration of discharge pipework systems and varies from zero when the valve is closed, to a maximum, when fully open. Conventional spring loaded valves can tolerate up to 10% of set pressure as built up back pressure. For back pressures in excess of 10%, a balanced bellows design is required to maintain valve lift.

Constant back pressure - conventional valve Variable back pressure - balanced bellows valve 3. Superimposed variable back pressure

This is caused by other valves discharging into a common disposal system, or other circumstances that cause the back pressure to be variable. Balanced bellows valves should be used for this condition, adjusted to the predetermined set pressure.

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SPRING FORCE

SYSTEM PRESSURE FORCE

Principles of operation – spring loaded safety and thermal relief valves

Safety relief valves use a spring force to hold a disc against a nozzle. Under normal system operating pressure, the valve will remain closed as the spring force is greater than the inlet system pressure force. The valve opens when the system pressure force becomes greater than the closing force of the spring.

Spring loaded safety and thermal relief valve

The WB and B/C series are designed to have a short simmer, open rapidly to full lift position and then re-seat at a controlled shut off pressure. This is demonstrated in the graph below, which shows the valve action and corresponding pressure at the valve inlet.

POPPING PRESSURE

RE-SEAT PRESSURE SET PRESSURE

Popping and blowdown

The opening and closing characteristics of the valve can be controlled by the adjustment of a

when the blowdown ring is in its lowest position there is a maximum exit area from the huddling chamber and the valve will have a longer simmer

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Stage 1 – Closed

Inlet pressure < set pressure

Inlet pressure is below the set pressure. The valve is closed and there is no flow through the valve.

Stage 2 – Simmering

Inlet pressure is = > set pressure and < popping pressure

Inlet pressure increases to set pressure. At this point, the spring force and system pressure force are equal; a further rise in inlet pressure will then begin to lift the disc slightly. A small amount of fluid is released into the huddling chamber (the valve simmers). The system fluid is now acting on a larger area inside the huddling chamber.

Stage 3 – Popping and opening

Inlet pressure = > popping pressure, valve fully open

The inlet pressure acting on a larger area produces a significant force to accelerate the opening. A combination of this pressure force, the kinetic energy from the fluid within the nozzle and the deflection force of the fluid flow turning through the reaction hood, is transformed into disc lifting force. The valve pops open at < 5% overpressure and the valve reaches the full open position at 110% of set pressure, in accordance with international codes.

Stage 4 – Reseating

Inlet pressure falls to re-seating pressure

As system pressure starts to fall, the force from the spring begins to close the valve. Typically, the system pressure falls between 5-10% below the valve set pressure at which point the spring force accelerates the valve disc to re-seat the valve. The difference between the set pressure and the re-seating pressure is known as blowdown.

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(up to and including class 600)

ITEM PART CARBON STEEL STAINLESS STEEL

1 Body SA 216-WCB CARB ST SA 351-CF8M ST ST

2 Casing SA 216-WCB CARB ST SA 351-CF8M ST ST

3 Cap SA 216-WCB CARB ST SA 351-CF8M ST ST

4* Nozzle 316 ST ST 316 ST ST

5* Disc 316 ST ST 316 ST ST

6* Disc holder ASTM A479-316L ASTM A479-316L

8 Blowdown ring SA 351-CF8M ST ST SA 351-CF8M ST ST

9 Guide Assy CARBON ST/17-4 ST ST 316L/17-4 ST ST

10* Spindle ASTM A479-431 ASTM A479-431

11 Lower spring plate ASTM A108-1021/Ni PLT ASTM A479-431

12 Adjusting screw ASTM A479-410 ASTM A479-410

13 Locking nut ASTM A108-1021 ASTM A479-316L

14 Setting screw ASTM A479-431 ASTM A479-431

15 Setting screw rod ASTM A479-316L ASTM A479-316L

18 Stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

19 Nut SA 194-2H CARB ST SA 194-8T ST ST

22* Spring CARBON STEEL ASTM A313-316

27* Body gasket ST-706 ST-706

28* Cap gasket ST-706 ST-706

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(up to and including class 600)

6* Disc holder INCLUDED IN ITEM 23 INCLUDED IN ITEM 23

9 Guide Assy CARBON ST/17-4 ST ST 316 L/17-4 ST ST

11 Lower spring plate ASTM A108-1021/Ni PLT ASTM A479-431

15 Set screw rod ASTM A479-316L ASTM A479-316L

18 Stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

19 Nut SA 194-2H CARB ST SA 194-8T ST ST

23* Bellows assembly ASTM A479-316L/SA240-316L ASTM A479-316L/SA240-316L

28* Cap gasket ST-706 ST-706

29* Set screw gasket ST-706 ST-706

31* Ball AISI 440C ST ST AISI 440C ST ST

32 Upper spring plate ASTM A108-1021/Ni PLT ASTM A479 431

33 Data plate 321 ST ST 321 ST ST

34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L

35 Grooved pin ASTM A479-431 ASTM A479-431

42 Drain plug HTS HOLO-KROME ASTM A479-316L

80* Circlip ASTM A313-316 ASTM A313-316

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(class 900 and above)

6* Disc holder ASTM A479-316L ASTM A479-316L

7 Reaction hood ASTM A479-431 ASTM A479-431

9 Guide plate 17-4 ST ST 17-4 ST ST

11 Lower spring cap ASTM A108-1021/Ni PLT ASTM A479-431

16* Tabwasher BS 1449-304S15 ST ST BS 1449-304S15 ST ST

17* Pinning screw ASTM A479-431 ASTM A479-431

18 Body stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

19 Body nut SA 194-2H CARB ST SA 194-8T ST ST

20 Casing stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

21 Casing nut SA 194-2H CARB ST SA 194-8T ST ST

24* Spindle head ASTM A479-431 ASTM A479-431

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(class 900 and above)

6* Disc holder base ASTM A479-321 ASTM A479-321

7 Reaction hood ASTM A479-431 ASTM A479-431

9 Guide plate 17-4 ST ST 17-4 ST ST

11 Lower spring cap ASTM A108-1021/Ni PLT ASTM A479-431

16* Tabwasher BS 1449-304S15 ST ST BS 1449-304S15 ST ST

17* Pinning screw ASTM A479-431 ASTM A479-431

18 Body stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

19 Body nut SA 194-2H CARB ST SA 194-8T ST ST

20 Casing stud SA 193-B7 CR/MOL ST SA 193-B8T ST ST

21 Casing nut SA 194-2H CARB ST SA 194-8T ST ST

23* Bellows SA240-316L SA240-316L

24* Spindle head ASTM A479-431 ASTM A479-431

25 Piston ASTM A479-431 ASTM A479-431

26 Guide spindle ASTM A479-321 ASTM A479-3431

28 Cap gasket ST-706 ST-706

29 Setting screw gasket ST-706 ST-706

31 Ball AISI 440C ST ST AISI 440C ST ST

32 Upper spring cap ASTM A108-1021/Ni PLT ASTM A479 431

33 Data plate 321 ST ST 321 ST ST

34 Hammer drive screw ELECTRO BRASSED ST ASTM A479-316L

35 Grooved pin ASTM A479-431 ASTM A479-431

42 Drain plug HTS HOLO-KROME ASTM A479-316L

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Bolted cap

Option available on the WB Series when required by the customer or for critical service where fragile gaskets materials may be fitted.

Screwed cap

This is the standard option on all valves.

Open lever*

The open lever assembly is not pressure tight and is therefore only suitable where vapour can safely

be allowed to escape to atmosphere. Packed lever*

The design of the packed lever assembly ensures that leakage does not occur when the valve is open or when back pressure is present.

Test gag GAG SCREW

SEALING PLUG

*A lift lever can be used to test for correct valve operation where corrosion or deposits could prevent the valve from opening. They can be used to release foreign particles trapped on the seat and must be fitted when codes dictate.

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Ferrule (government ring)

A ferrule, sometimes known as a government ring, is a collar fitted beneath the head of the pressure adjusting screw. Some authorities will require a ferrule to be fitted to prevent unauthorised inter-ference with the set pressure.

Steam jacket

Some process media can solidify or form crystals if they cool within the system. The medium within the valve nozzle is not in the flow path and thus cooling can occur. Should the medium solidify, crystallise, or if sublimation of vapour was to occur within the nozzle, the valve may not lift.

The steam jacket is

designed to keep the process medium hot, helping to

maximise plant safety. The steam jacket has both an inlet and outlet so that low pressure steam can be passed through the jacket, keeping the valves hot. This allows the valves to stay operational, enabling the valve to successfully relieve pressure, should an overpressure situation occur.

The steam jacket is manufactured out of material that is compatible with the body of the valve and the connections to the jacket can either be flanged or screwed.

Soft seat

An O-ring seal offers maximum seat tightness, over and above that of the standard metal-to-metal seats. A wide range of seal materials are available including Viton, Nitrile, Kalrez and PTFE. For high integrity seat leakage, specify soft seat.

Auxiliary back-up piston

In the event of bellows failure, a potentially dangerous situation can arise. The back pressure causes an “out-of-balance” situation which may cause:

1 Increase in set pressure. 2 Decrease in flow capacity. 3 Increase in re-seat pressure.

Specifying bellows valves with an auxiliary back-up piston ensures that the above does not occur. The piston itself has the same effective diameter as the failed bellows, so any effect of the back pressure increasing the set pressure is counteracted by an upward thrust of the piston. This is an added safety feature. The WB 300 valve has

incorporated the auxiliary back-up piston since its inception. It is available as standard in all pressure classes 900 and above and as an optional feature for class 600 and below.

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Body material

1 Carbon steel WCB 2 Carbon steel WCB NACE 3 Stainless steel CF8M NACE 4 Stainless steel CF8M

5 Carbon steel low temperature LCB

Flange face

1 ANSI RF x RF 2 ANSI RTJ inlet x RF O Special

ANSI flange rating inlet x outlet

1 150 x 150 2 300 x 150 3 600 x 150 4 900 x 150 5 900 x 300 6 1500 x 150 7 1500 x 300 8 2500 x 300 O Special Valve type 1 Liquid bellows 2 Liquid conventional 3 Vapour bellows 4 Vapour conventional Design H ANSI 150, 300 and 600 / ANSI 900, 1500 and 2500 Outlet diameter 2” - 10”

API orifice letter

D - T Inlet diameter 1” - 8” Accessories_B _Auxiliary back-up piston C Bolted cap D Screwed cap F Ferrule (Government ring) G Test gag H* High Pressure M Open lever P Packed lever R Soft seat S Special feature 3 WB300 Bellows

Trim material nozzle and disc

1 Stainless steel PH 17/4 2 Stainless steel 316

3 Aluminium bronze / Monel 4 Hastelloy B

5 Stainless steel 316 stellited 6 Monel 7 Stainless steel 304 O Special Spring material 1 Carbon steel 2 Stainless steel 316 6 Tungsten alloy 9 Hastelloy B A Aluminium Coated CS N Stainless steel PH 17/4 Q Stainless steel PH 17/4 NACE T Aluminium Coated Tungsten Z Inconel X750

O Special

/

*In some instances when both high pressures and alloy springs are required, the ‘H’ needs adding to accessories. See individual orifice pages.

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BODY

1 Carbon steel SA 216-WCB –20 –29 800 427

2 Carbon steel (NACE) SA 216-WCB –20 –29 800 427

3 Stainless steel (NACE) SA 351-CF8M –450 –267 1000 538

4 Stainless steel SA 351-CF8M –450 –267 1000 538

5 Low Temp. CS SA 352-LCB –50 –46 800 427

6 Bronze (Oxygen spec.) BS 1400 LG2 –450 –267 450 232

8 0.5% MOLY CS SA 217-WC6 –20 –29 1000 538 9 Hastelloy B SA 494-N12MV –20 –29 1000 538 SPRING 1 Carbon steel –75 –59 450 232 A Aluminium coated CS –75 –59 450 232 2 Stainless steel (316) –450 –267 500 260 6 Tungsten alloy (BH12) –4 –20 1000 427

T Aluminium coated tungsten –4 –20 1000 427

9 Hastelloy B –20 –29 800 427

N Stainless steel (PH17/4) –130 –90 752 400

Q Stainless steel (PH17/4 NACE) –130 –90 752 400

Z Inconel X750 –450 –267 1000 538

TRIM (Nozzle and disc)

1 Stainless steel (PH 17/4 NACE 29-33 HRC) –130 –90 752 400

2 Stainless steel (316) –450 –267 1000 538

3 Al. Bronze/Monel –76 –60 572 300

4 Hastelloy B –20 –29 1000 538

5 Stainless steel (316 Stellited 39-43 HRC) –321 –196 1000 538

6 Monel –321 –196 800 427 7 Stainless steel 304 –238 –150 1000 538 GASKETS NAF (ST-706) –40 –40 800 427 Graphite (Supergraf) –328 –200 932 500 Gylon 3504 –321 –196 500 260 SOFT SEAT Nitrile –40 –40 212 100 Viton –22 –30 392 200 Silicon –85 –65 446 230 Ethylene Propylene –58 –50 275 135 PTFE –454 –270 428 220 Kalrez –20 –29 500 260 BOLTING B7 Alloy steel –20 –29 800 427 B8T Stainless Steel –454 –270 1000 538 Monel K500 –274 –170 482 250

Description Minimum Maximum

deg F deg C deg F deg C

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– 0.110 in

– 71 mm

2

D

0 0 10 20 30 34.5 50 69 100 200 300 413.8 100 200 300 400 500 1000 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 2000 3000 4000 5000 6000 ST AINLESS STEEL SS - CF8M CARBON STEEL - WCB CARBON STEEL TUNGSTEN CS - WC6 538 1000 427 800 232 450 -29 -20 -59 -75 -268 -450

7

1

17

16

15

14

13

12

2

3

4

5

6

8 9 10

11

TEMPERATURE LIMITS API 526 SPRING BODY

SET PRESSURE - PSIG

SET PRESSURE - BAR G.

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 1 x 2 150 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 300 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 600 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 42 (19) 11_/ 2x 2 900 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 90 (41) 1500 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 97 (44) 11_/ 2x 3 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 115 (52)

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– 0.110 in

– 71 mm

2

D

1 1 x 2 150#RF 150#RF - - 285 185 80 - 285 230 2 1 x 2 300#RF 150#RF - - 740 615 410 - 285 230 3 1 x 2 600#RF 150#RF - - 1480 1235 825 - 285 230 4 11/2x 2 900#RF 300#RF - - 2220 1845 1235 - 600 500 5 11/2x 2 1500#RF 300#RF - - 3705 3080 2060 - 600 500 6 11/2x 3 2500#RF 300#RF - - 6000 5135 3430 - 740 500 7 1 x 2 300#RF 150#RF - - - - 510 225 285 230 8 1 x 2 600#RF 150#RF - - - - 1015 445 285 230 9 11/2x 2 900#RF 300#RF - - - - 1525 670 600 500 10 11/2x 2 1500#RF 300#RF - - - - 2540 1115 600 500 11 11/2x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 1 x 2 150#RF 150#RF 275 275 - - - - 275 230 13 1 x 2 300#RF 150#RF 720 720 - - - - 275 230 14 1 x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 11/2x 2 900#RF 300#RF 2160 2160 - - - - 600 500 16 11/2x 2 1500#RF 300#RF 3600 3600 - - - - 600 500 17 11/2x 3 2500#RF 300#RF 4000 6000 - - - - 720 500 Key

No. Inlet Outlet Body

Mat’l -76°F to -450°F -21°F to -75°F 100°F to -20°F 450°F 800°F 1000°F -60°C to -268°C -30°C to -59°C 38°C to -29°C 232°C 427°C 538°C _Conventional Valve Balanced Bellows Valve Valve size inlet x outlet (ins)

Flanges ANSI Max. Set Pressure (psig) and Temperature Limits

Max. Back Pressure

(psig)

RF=Raised Face

Note: Soft seated valves require a minimum set pressure of 15 psig.

High Pressure Version

There is no requirement to have an high pressure version for this orifice. Minimum set pressure limits for metal seat trim

Conventional – 7 psig

Bellows - Gas – 22 psig

Bellows - Liquid – 59 psig*

(Inverted)

*For liquid bellows valves below this pressure refer to factory WCB

WC6

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– 0.196 in

– 127 mm

2

E

0 0 10 20 30 34.5 50 69 100 200 300 413.8 100 200 300 400 500 1000 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 2000 3000 4000 5000 6000 ST AINLESS STEEL SS - CF8M CARBON STEEL - WCB CARBON STEEL TUNGSTEN CS - WC6 538 1000 427 800 232 450 -29 -20 -59 -75 -268 -450

7

1

17

16

15

14

13

12

2

3

4

5

6

8 9 10

11

TEMPERATURE LIMITS API 526 SPRING BODY

SET PRESSURE - PSIG

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 1 x 2 150 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 300 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 40 (18) 600 x 150 4.125 1.437 13.875 4.500 0.582 2 3/8 3/4 42 (19) 11_/ 2x 2 900 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 90 (41) 1500 x 300 4.125 1.750 25.000 5.500 0.625 5 3/8 3/4 97 (44) 11_/ 2x 3 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 115 (52)

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– 0.196 in

– 127 mm

2

E

1 1 x 2 150#RF 150#RF - - 285 185 80 - 285 230 2 1 x 2 300#RF 150#RF - - 740 615 410 - 285 230 3 1 x 2 600#RF 150#RF - - 1480 1235 825 - 285 230 4 11/2x 2 900#RF 300#RF - - 2220 1845 1235 - 600 500 5 11/2x 2 1500#RF 300#RF - - 3705 3080 2060 - 600 500 6 11/2x 3 2500#RF 300#RF - - 6000 5135 3430 - 740 500 7 1 x 2 300#RF 150#RF - - - - 510 225 285 230 8 1 x 2 600#RF 150#RF - - - - 1015 445 285 230 9 11/2x 2 900#RF 300#RF - - - - 1525 670 600 500 10 11/2x 2 1500#RF 300#RF - - - - 2540 1115 600 500 11 11/2x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 1 x 2 150#RF 150#RF 275 275 - - - - 275 230 13 1 x 2 300#RF 150#RF 720 720 - - - - 275 230 14 1 x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 11/2x 2 900#RF 300#RF 2160 2160 - - - - 600 500 16 11/2x 2 1500#RF 300#RF 3600 3600 - - - - 600 500 17 11/2x 3 2500#RF 300#RF 4000 6000 - - - - 720 500 Key

(psig)

RF=Raised Face

(Inverted)

WC6

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– 0.307 in

– 198 mm

2

F

0 0 10 20 30 40 48.3 69 200 344.8 100 200 300 400 500 600 700 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 3000 5000

7

1

17

15

14

13

12

16

2

3

4

5

6

8 9 10

11

ST AINLESS STEEL SS - CF8M CARBON STEEL - WCB CARBON STEEL TUNGSTEN CS - WC6 538 1000 427 800 232 450 -29 -20 -59 -75 -268 -450 TEMPERATURE LIMITS API 526 SPRING BODY

SET PRESSURE - PSIG

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 11_/₂ _{x 2} _{150 x 150} _4.875 _1.625 _14.625 _4.750 _0.750 ₂ _3/8 _3/4 _{46 (21)} 300 x 150 4.875 1.625 14.625 6.000 0.750 2 3/8 3/4 46 (21) 600 x 150 4.875 1.625 14.625 6.000 0.750 2 3/8 3/4 46 (21) 11_/₂ _{x 3} _{900 x 300} _4.875 _1.750 _26.750 _6.500 _0.500 ₅ _3/8 _3/4 _{101 (46)} 1500 x 300 4.875 1.750 26.750 6.500 0.500 5 3/8 3/4 101 (46) 2500 x 300 5.500 2.375 26.875 6.500 0.625 5 3/8 3/4 117 (53)

(25)

– 0.307 in

– 198 mm

2

F

1 11/2x 2 150#RF 150#RF - - 285 185 80 - 285 230 2 11/2x 2 300#RF 150#RF - - 740 615 410 - 285 230 3 11/2x 2 600#RF 150#RF - - 1480 1235 825 - 285 230 4 11/2x 3 900#RF 300#RF - - 2220 1845 1235 - 740 500 5 11/2x 3 1500#RF 300#RF - - 3705 3080 2060 - 740 500 6 11/2x 3 2500#RF 300#RF - - 5000 5000 3430 - 740 500 7 11/2x 2 300#RF 150#RF - - - - 510 225 285 230 8 11/2x 2 600#RF 150#RF - - - - 1015 445 285 230 9 11/2x 3 900#RF 300#RF - - - - 1525 670 740 500 10 11/2x 3 1500#RF 300#RF - - - - 2540 1115 740 500 11 11/2x 3 2500#RF 300#RF - - - - 4230 1860 740 500 12 11/2x 2 150#RF 150#RF 275 275 - - - - 275 230 13 11/2x 2 300#RF 150#RF 720 720 - - - - 275 230 14 11/2x 2 600#RF 150#RF 1440 1440 - - - - 275 230 15 11/2x 3 900#RF 300#RF 2160 2160 - - - - 720 500 16 11/2x 3 1500#RF 300#RF 2200 3600 - - - - 720 500 17 11/2x 3 2500#RF 300#RF 3400 5000 - - - - 720 500 Key

(psig)

RF=Raised Face

(Inverted)

WC6

(26)

– 0.503 in

– 325 mm

2

G

SET PRESSURE - PSIG

0 0 10 20 50 69 100 150 200 275.9 100 200 300 500 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 2000 3000 4000

7

1 16 + 17

16

15

14

13

12

2

3

4

5

6

8

9

10

11

17

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 11_/₂ _{x 3} _{150 x 150} _4.875 _1.312 _18.750 _4.750 _0.500 ₂ _3/8 _3/4 _{60 (27)} 300 x 150 4.875 1.312 18.750 6.000 0.500 2 3/8 3/4 64 (29) 600 x 150 4.875 1.437 18.750 6.000 0.500 2 3/8 3/4 66 (30) 900 x 300 4.875 1.750 27.500 6.500 0.500 5 3/8 3/4 119 (54) 2 x 3 1500 x 300 6.125 2.125 32.000 6.750 0.500 5 1/2 3/4 126 (57) 2500 x 300 6.125 2.812 32.000 6.750 0.687 2 1/2 3/4 139 (63)

(27)

– 0.503 in

– 325 mm

2

G

1 11/2x 3 150#RF 150#RF - - 285 185 80 - 285 230 2 11/2x 3 300#RF 150#RF - - 740 615 410 - 285 230 3 11/2x 3 600#RF 150#RF - - 1480 1235 825 - 285 230 4 11/2x 3 900#RF 300#RF - - 2220 1845 1235 - 740 470 5 2 x 3 1500#RF 300#RF - - 3705 3080 2060 - 740 470 6 2 x 3 2500#RF 300#RF - - 3705 3705 3430 - 740 470 7 11/2x 3 300#RF 150#RF - - - - 510 225 285 230 8 11/2x 3 600#RF 150#RF - - - - 1015 445 285 230 9 11/2x 3 900#RF 300#RF - - - - 1525 670 740 470 10 2 x 3 1500#RF 300#RF - - - - 2540 1115 740 470 11 2 x 3 2500#RF 300#RF - - - - 3705 1860 740 470 12 11/2x 3 150#RF 150#RF 275 275 - - - - 275 230 13 11/2x 3 300#RF 150#RF 720 720 - - - - 275 230 14 11/2x 3 600#RF 150#RF 1440 1440 - - - - 275 230 15 11/2x 3 900#RF 300#RF 1600 2160 - - - - 720 470 16 2 x 3 1500#RF 300#RF 2450 3600 - - - - 720 470 17 2 x 3 2500#RF 300#RF 2600 3600 - - - - 720 470 Key

(psig)

RF=Raised Face

(Inverted)

WC6

(28)

– 0.785 in

– 506 mm

2

H

SET PRESSURE - PSIG

0 0 10 20 30 34.5 50 69 100 150 206.9 100 200 300 400 500 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 2000 3000

7

1 11 + 12

13

14

15

16

2

3

4

5

6

8

9

10

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 11_/₂_{x 3} _{150 x 150} _5.125 _1.375 _18.750 _4.875 _0.500 ₂ _3/8 _3/4 _{60 (27)} 300 x 150 5.125 1.375 18.750 4.875 0.500 2 3/8 3/4 60 (27) 2 x 3 300 x 150 5.125 1.375 19.000 4.875 0.500 2 3/8 3/4 64 (29) 600 x 150 6.062 1.687 20.000 6.375 0.687 2 3/8 3/4 86 (39) 900 x 150 6.062 2.312 31.750 6.375 0.687 5 1/2 3/4 176 (80) 1500 x 300 6.062 2.375 32.000 6.375 0.750 5 1/2 3/4 187 (85)

(29)

Inlet Max. Set Spring Material (pressures in Psig)

Orifice rating Pressure Psig Carbon st. 316 SS Tungsten 17/4PH 17/4PH NACE Inconel X750

1.5H 150# 285 n/a n/a n/a n/a n/a n/a

1.5H 300# 285 n/a n/a n/a n/a n/a n/a

2H 300# 740 n/a n/a n/a n/a n/a n/a

2H 600# 1480 n/a 1000 n/a n/a 1000 n/a

– 0.785 in

– 506 mm

2

H

High Pressure Version.

Certain spring materials cannot be used in the low pressure version of the valve, up to the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add “H” to the valve accessories to select an high pressure valve.

1 11/2x 3 150#RF 150#RF - - 285 185 80 - 285 230 2 11/2x 3 300#RF 150#RF - - 285 285 285 - 285 230 3 2 x 3 300#RF 150#RF - - 740 615 410 - 285 230 4 2 x 3 600#RF 150#RF - - 1480 1235 825 - 285 230 5 2 x 3 900#RF 150#RF - - 2220 1845 1235 - 285 230 6 2 x 3 1500#RF 300#RF - - 2750 2750 2060 - 740 415 7 2 x 3 300#RF 150#RF - - - - 510 225 285 230 8 2 x 3 600#RF 150#RF - - - - 815 445 285 230 9 2 x 3 900#RF 150#RF - - - - 1225 670 285 230 10 2 x 3 1500#RF 300#RF - - - - 2040 1115 740 415 11 11/2x 3 150#RF 150#RF 275 275 - - - - 275 230 12 11/2x 3 300#RF 150#RF 275 275 - - - - 275 230 13 2 x 3 300#RF 150#RF 720 720 - - - - 275 230 14 2 x 3 600#RF 150#RF 1440 1440 - - - - 275 230 15 2 x 3 900#RF 150#RF 1485 2160 - - - - 275 230 16 2 x 3 1500#RF 300#RF 1600 2750 - - - - 720 415 Key

(psig)

RF=Raised Face

Note: Soft seated valves require a minimum set pressure of 15 psig. Minimum set pressure limits for metal seat trim

(Inverted)

WC6

(30)

VA LV E S E L E C T I O N G U I D E

_{– 1.287 in}

– 830 mm

2

J

16

0 0 10 20 30 34.5 50 69 100 150 206.9 100 200 300 400 500 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 2000 3000

7

1 11 + 12

13

14 15 +16

2

3

4

5

6

10

8

9

SET PRESSURE - PSIG

14

15

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 2 x 3 150 x 150 5.375 1.625 19.250 4.875 0.750 2 3/8 3/4 64 (29) 300 x 150 5.375 1.625 19.250 4.875 0.750 2 3/8 3/4 64 (29) 3 x 4 300 x 150 7.250 2.125 21.750 7.125 0.750 2 3/8 3/4 82 (37) 600 x 150 7.250 2.125 23.000 7.125 0.750 2 3/8 3/4 99 (45) 900 x 150 7.250 2.375 33.875 7.125 0.750 5 1/2 3/4 231 (105) 1500 x 300 7.250 2.750 33.875 7.125 0.750 5 1/2 3/4 253 (115)

(31)

VA LV E S E L E C T I O N TA B L E

_{– 1.287 in}

– 830 mm

2

J

2J 150# 285 n/a n/a n/a n/a n/a n/a

2J 300# 285 n/a n/a n/a n/a n/a n/a

3J 300# 740 n/a 500 n/a n/a 430 n/a

3J 600# 1480 n/a 900 n/a 900 870 900

1 2 x 3 150#RF 150#RF - - 285 185 80 - 285 230 2 2 x 3 300#RF 150#RF - - 285 285 285 - 285 230 3 3 x 4 300#RF 150#RF - - 740 615 410 - 285 230 4 3 x 4 600#RF 150#RF - - 1480 1235 825 - 285 230 5 3 x 4 900#RF 150#RF - - 2220 1845 1235 - 285 230 6 3 x 4 1500#RF 300#RF - - 2700 2700 2060 - 600 230 7 3 x 4 300#RF 150#RF - - - - 510 225 285 230 8 3 x 4 600#RF 150#RF - - - - 815 445 285 230 9 3 x 4 900#RF 150#RF - - - - 1225 670 285 230 10 3 x 4 1500#RF 300#RF - - - - 2040 1115 600 230 11 2 x 3 150#RF 150#RF 275 275 - - - - 275 230 12 2 x 3 300#RF 150#RF 275 275 - - - - 275 230 13 3 x 4 300#RF 150#RF 500 720 - - - - 275 230 14 3 x 4 600#RF 150#RF 625 1440 - - - - 275 230 15 3 x 4 900#RF 150#RF 800 2160 - - - - 275 230 16 3 x 4 1500#RF 300#RF 800 2700 - - - - 600 230 Key

(psig)

RF=Raised Face

Conventional – 1.5 psig

(Inverted)

WC6

(32)

– 1.838 in

– 1185 mm

2

K

0 0 10 20 30 40 48.3 69 100 150 206.9 100 200 300 400 500 600 700 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 2000 3000 INCONEL

6

1

12

13

12 +

13

14

10

11

2

3

4

5

9

7

8

SET PRESSURE - PSIG

14

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 3 x 4 150 x 150 6.125 2.000 21.750 6.375 0.875 3 3/8 3/4 108 (49) 300 x 150 6.125 2.000 21.750 6.375 0.875 3 3/8 3/4 108 (49) 600 x 150 7.250 2.125 23.500 7.125 0.875 3 3/8 3/4 141 (64) 3 x 6 900 x 150 7.812 2.562 40.000 8.500 0.937 5 3/4 3/4 339 (154) 1500 x 300 7.750 2.875 40.000 8.500 0.875 5 3/4 3/4 353 (160)

(33)

– 1.838 in

– 1185 mm

2

K

K 150# 285 n/a n/a n/a n/a n/a n/a

K 300# 740 n/a 450 n/a n/a 600 n/a

K 600# 1480 n/a 750 n/a n/a 570 1070

Certain spring materials can not be used in the low pressure version of the valve, up to the maximum pressure. If the required set pressure with your choice of spring material is in excess of the figure shown in the table either choose another material or add “H” to the valve accessories to select an high pressure valve.

1 3 x 4 150#RF 150#RF - - 285 185 80 - 285 150 2 3 x 4 300#RF 150#RF - - 740 615 410 - 285 150 3 3 x 4 600#RF 150#RF - - 1480 1235 825 - 285 200 4 3 x 6 900#RF 150#RF - - 2220 1845 1235 - 285 200 5 3 x 6 1500#RF 300#RF - - 2220 2220 2060 - 600 200 6 3 x 4 300#RF 150#RF - - - - 510 215 285 150 7 3 x 4 600#RF 150#RF - - - - 815 445 285 200 8 3 x 6 900#RF 150#RF - - - - 1225 670 285 200 9 3 x 6 1500#RF 300#RF - - - - 2040 1115 600 200 10 3 x 4 150#RF 150#RF 275 275 - - - - 275 150 11 3 x 4 300#RF 150#RF 525 720 - - - - 275 150 12 3 x 4 600#RF 150#RF 600 1440 - - - - 275 200 13 3 x 6 900#RF 150#RF 600 2160 - - - - 275 200 14 3 x 6 1500#RF 300#RF 750 2220 - - - - 600 200 Key

(psig)

RF=Raised Face

(Inverted)

WC6

(34)

– 2.853 in

– 1840 mm

2

L

0 0 10 20 30 4040 50 60 69 103.5 200 400 600 800 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 1500

7

1

14

13 13 + 14

15 11 + 12

2

3

4

5

6

8

9

10

SET PRESSURE - PSIG

15

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 3 x 4 150 x 150 6.125 2.000 21.750 6.500 0.875 4 3/8 3/4 108 (49) 300 x 150 6.125 2.000 21.750 6.500 0.875 4 3/8 3/4 108 (49) 4 x 6 300 x 150 7.062 2.062 27.000 7.125 0.812 5 1/2 1 234 (106) 600 x 150 7.062 2.312 28.250 8.000 0.812 5 1/2 1 249 (113) 900 x 150 7.750 2.687 41.875 8.750 0.750 5 1/2 1 353 (160)

(35)

– 2.853 in

– 1840 mm

2

L

3L 150# 285 n/a n/a n/a n/a 255 n/a

3L 300# 285 n/a n/a n/a n/a 255 n/a

4L 300# 740 n/a n/a n/a n/a n/a n/a

4L 600# 1000 n/a 850 n/a n/a 825 n/a

1 3 x 4 150#RF 150#RF - - 285 185 80 - 285 100 2 3 x 4 300#RF 150#RF - - 285 285 285 - 285 100 3 4 x 6 300#RF 150#RF - - 740 615 410 - 285 170 4 4 x 6 600#RF 150#RF - - 1000 1000 825 - 285 170 5 4 x 6 900#RF 150#RF - - 1500 1500 1235 - 285 170 6 4 x 6 1500#RF 150#RF - - 1500 1500 1500 - 285 170 7 4 x 6 300#RF 150#RF - - - - 510 225 285 170 8 4 x 6 600#RF 150#RF - - - - 1000 445 285 170 9 4 x 6 900#RF 150#RF - - - - 1500 670 285 170 10 4 x 6 1500#RF 150#RF - - - - 1500 1115 285 170 11 3 x 4 150#RF 150#RF 275 275 - - - - 275 100 12 3 x 4 300#RF 150#RF 275 275 - - - - 275 100 13 4 x 6 300#RF 150#RF 535 720 - - - - 275 170 14 4 x 6 600#RF 150#RF 535 1000 - - - - 275 170 15 4 x 6 900#RF 150#RF 700 1500 - - - - 275 170 Key

(psig)

RF=Raised Face

(Inverted)

WC6

(36)

– 3.60 in

– 2320 mm

2

M

0 0 10 20 30 4040 50 60 69 103.5 200 400 600 800 1000 900 800 700 600 500 400 300 200 100 0 -100 -200 -300 -400 -450 -268-250 -200 -150 -100 -50 0 50 100 150 200 250 300 350 400 450 500 538 1000 1500 INCONEL

5

1

10

9

8

10

2

3

4

6

7

SET PRESSURE - PSIG

* – If a gag is fitted, add 0.5 ins.

– If a lever is fitted, add a maximum of 3.5 inch. (Only if flange rating is 600# or less.)

Size Rating A B C* D E F G H† Wt (ins) lbs (kg) 4 x 6 150 x 150 7.000 2.000 26.500 7.250 0.750 5 1/2 1 234 (106) 300 x 150 7.000 2.000 26.500 7.250 0.750 5 1/2 1 234 (106) 600 x 150 7.000 2.250 28.250 8.000 0.750 5 1/2 1 249 (113) 900 x 150 7.750 2.500 41.875 8.750 0.750 5 1/2 1 377 (171)