37

Relief Valves

Relief Valves For Transports And Delivery Trucks

PartNumber

Start To DischargePressure

Flow Capacity SCFM/Air Suitable ForTanks With

Surface AreaUp To:

ProtectiveCap

(Included)UL ASME

A8434N 265 PSIG3700

3659175 Sq. Ft. A8434-11B

A8434G 250 PSIG 3456

A8436N 265 PSIG10210

9839602 Sq. Ft. A8436-11B

A8436G 250 PSIG 9598

WrenchNumber A B

A8434-40 1-3/8” 3-5/16”

A8436-40 2’ 5”

Relief Valves For DOT Forklift Cylinders

7545-40

7545-14A 7545-12

A8434-11B

8545AK8545AK

8545AK

A8434GA8434 & A8436 WrenchesBobtail Application

7545-14A

7545-12

Designed for use as a primary relief valve in transports and delivery trucks with 2” and 3” NPT couplings. Low profile design.

Designed for use as a primary relief valve on forklift cylinders.

PartNumber

Start ToDischarge

Setting

ContainerConnection

ProtectiveCap

Deflectors

45O Elbow 90O Elbow

8545AK 375 PSIG 3/4” MNPT SeeDiagrams 7545-14A 7545-12

9103-54

R

R

3100-54

Cap for Relief

OctagonalWrenching

Flats

Caps for Deflection Elbows

Deflection Elbows

Typical Lift Truck ReliefValve Installation

10

20

3040

TANK VOLUME

50%

OF

6070

80

A8434G

A

A

A

B

R

1/8

3/8

1/8

1/4

1/4

7384

DO NOTUSE FORFILLING

10%

27%

12%

43%

HORIZO

T AL VERTICAL

PROPANE

R

38

Relief Valves

Relief Valves For Motor Fuel Containers

PartNumber

ContainerType

Start ToDischarge

Setting

ContainerConnection

(MNPT)

Flow Capacity SCFM/Air ProtectiveCap

(Included)

ProtectivePlug

(Optional)

PipeawayAdapter(MNPT)UL ASME

8544G

ASME

250 PSIG1” 1020 936 7544-41 7545-40 7544-11A

8543G 1-1/4” 1465 1400 7543-40C ---- 7543-10

8544T312 PSIG

1” 1282 1158 7544-41 7545-40 7544-11A

8543T 1-1/4” 1990 1731 7543-40C ---- 7543-10

8544K DOT/ASME 375 PSIG 1” 1545 ---- 7544-41 7545-40 7544-11A

7543-108543G in 420 lb. Cylinder 8544G in Motor Fuel Tank

8544G

7545-40

Designed for use as a primary relief valve on smaller ASME and DOT fuel containers.

R

1/4

E

F

1/2

3/4

90R

Relief Valves For ASME Storage Tanks

* See the relief valve cap page for additional cap options.**3” FNPT Outlet Connection.

8684G7534G

PartNumber

Start ToDischargePressure

ContainerConnection

Flow Capacity SCFM/Air Suitable ForTanks With

Surface AreaUp To:

ProtectiveCap*

PipeawayAdapter

UL ASME

7583G

250 PSIG

3/4” MNPT 1980 1806 80 Sq. Ft. 7583-40X-----

8684G 1” MNPT 2620 2565 113 Sq. Ft. 8684-40

8685G 1-1/4” MNPT 4385 4035 212 Sq. Ft. 7585-40X

7534G 2” MNPT 11675 10442 708 Sq. Ft. 7534-40 7534-20**

Designed for use as a primary relief valve in ASME storage tanks.Low profile design reduces chance of external damage or sheering.The 7534G has 3” MNPT external threads for attachment of vent stacks. The accessory 7534-20 pipeaway adapter has a break-off groove to prevent damage to the relief valve from external sheer on the vent stack.

8684G Installed

39

Relief Valves

External Relief Valves For Propane ASME Storage Tanks

3131G3135-103135G

Designed for use as a primary relief valve in ASME storage tanks. All the working components of these relief valves are outside the container connection, so the valve must be protected from physical damage. The accessory pipeaway adapters have a break-off groove to prevent damage to the relief valve from external sheer on the vent stack.

A3149G

PartNumber

Start ToDischargePressure

ContainerConnection

Flow Capacity SCFM/Air

Suitable ForTanks With

Surface AreaUp To:

Protec-tiveCap

Pipeaway Adapter

UL ASME Part Number Size

3131G

250 PSIG

3/4” MNPT 2060 ---- 85 Sq. Ft. 3131-54 3131-10 1” FNPT

W3132G 1” MNPT 3340 ---- 154 Sq. Ft.3132-54

3132-10 1-1/4” FNPT

3132G 1-1/4” MNPT 4130 ---- 200 Sq. Ft. 3132-10 1-1/4” FNPT

3135G 1-1/4” MNPT 5770 ---- 300 Sq. Ft. 3135-54 3135-10 2” FNPT

3133G 1-1/2” MNPT 6080 ---- 320 Sq. Ft. 3133-54 3133-10 2” FNPT

A3149G 2-1/2” MNPT 10390 9153 613 Sq. Ft. 3149-40 Integral 3” FNPT

External Relief Valves For NH3 ASME Storage TanksPrimarily for use on NH3 stationary storage tanks, these relief valves provide maximum safety with minimum product loss.All the working components of these relief valves are outside the container connection, so the valve must be protected from physical damage.

PartNumber

Start ToDischargePressure

ContainerConnection

Flow Capacity SCFM/Air Suitable For

Tanks WithSurface Area

Up To:Protective

Cap

Pipeaway Adapter

UL ASME Part Number Size

AA3126L250

250 PSIG

1/2” MNPT 277 ---- 23 Sq. Ft. 7545-40 AA3126-10 1/2” MNPT

AA3130UA250 3/4” MNPT 2045 1838 249 Sq. Ft. AA3130-40P AA3131-10 1 “ FNPT

AA3135UA250 1-1/4” MNPT 6430 5080 1010 Sq. Ft. AA3135-40P AA3135-10 2” FNPT

AA3130UA265265 PSIG

3/4” MNPT 2125 1912 261 Sq. Ft. AA3130-40P AA3131-10 1 “ FNPT

AA3135UA265 1-1/4” MNPT 6615 5370 1045 Sq. Ft. AA3135-40P AA3135-10 2” FNPT

AA3135UA250 AA3130UA250 AA3131-10

40

Relief Valves

DuoPort Pressure Relief Manifolds

PartNumber

ContainerConnection Application

Start ToDischargePressure

Relief Valve Included Flow Capac-ity

SCFM/Air*ULQuantity

PartNumber

InletConnection

PipeawayAdapters

8542G

2” MNPT

LP-Gas250 PSIG

2

3135MG

1-1/4” MNPT

3135-10 5250 (1)

AA8542UA250NH3

AA3135UA250AA3135-10

5865 (1)

AA8542UA265 265 PSIG AA3135UA265 5975 (1)

* Flow rating based on number of reliefs shown in parenthesis ().

MultiPort Pressure Relief Manifolds

* Flow rating based on number of reliefs shown in parenthesis ().

Designed especially for use as a primary relief device on smaller stationary storage containers with 2” NPT threaded couplings. These manifolds allow servicing or re-placement of either of the two relief valves without evacuating the container or loss of service. The operating lever selectively closes off the entrance port to the relief valve being removed while the remaining valve provides protection for the container and its contents. The rating of each manifold is based on actual flow through the manifold and a single pressure relief valve, taking friction loss into account. It is not merely the rating of the relief valve alone.

Designed especially for use as a primary relief device on large stationary pressurized storage containers with flanged openings. These manifolds incorporate an additional relief valve, not included in the flow rating, allowing for servicing or replacement of any one of the relief valves without evacuating the container. The handwheel on the manifold selectively closes off the entrance port of the relief valve being removed while the remaining relief valves provide protection for the container and its contents. All manifold flow ratings are based on flow through the relief valves after one has been removed for service or replacement.

Order Studs Separately

PartNumber Size

For UseWith For Connection To:

NumberRequired

7560-55 3/4” X 4-1/2” All RegOMultiPorts

Weld Neck Flange Mount 8

7560-56 3/4” X 3-1/2” Std Tank Pad Mount

PartNumber

ContainerFlange

Connec-tion Applica-

tion

Start ToDischargePressure

Relief Valve IncludedFlow Capacity

SCFM/Air*Quantity Part

NumberInlet

ConnectionPipeawayAdapters UL ASME

A8563G3” 300# LP or NH3

250 PSIG

3 A3149MG 2-1/2” MNPT

Integral 3” FNPT

18,500 (2) 16,292 (2)

A8564G 4 A3149MG 27,750 (3) 24,438 (3)

AA8573G

4” 300#

NH33

AA3135MUA250 1-1/4” MNPT AA3135-10 11,400 (2) -----

A8573GLP or NH3

A3149MG 2-1/2” MNPT

Integral 3” FNPT

18,500 (2) 16,292 (2)

A8574G 4 A3149MG 27,750 (3) 24,438 (3)

12

41

Relief Valves

4” Flanged Pressure Relief ValvesExchange Service OnlyThese valves are commonly found on older large storage tanks.The valve is “sandwiched” between a flange welded in the tank and a retaining flange on top of the valve which is tapped 4” FNPT to accept the vent stacks.

# 900112703” Modified FlexSealing Gasket

# 900112944” CompositionWeather Gasket

Tank Pad

Typical MountingReconditioned

4” ReliefExchange Only

(no longer manufactured)

New MBF-A4” Relief

250# Set Pressure15452 SCFM

4” Relief Stack3/4” X 4-1/2”Studs

Relief Valve Sizing for Common Large ASME TanksThe relief valves used for protection on ASME storage containers have a minimum required flow rate determined by the outside surface area of the container. The following chart lists the common large ASME storage containers and their associated required relief flow rates. When selecting relief valves for a particular tank, make sure the flow rate on the relief valve equals or exceeds the rquired flow from the chart.

TankGallons

Tank I.D. Inches O.A.L

OutsideSurface

Area sq. ft.

RequiredFlow

SCFM/AIR

2,000 46 23’ 10-3/8” 306 5,856

3,000 46 35’ 5-3/8” 441 7,907

4,000 65 24’ 11-1/2” 431 7,759

5,000 65 31’ 4-1/2” 543 9,371

6,000 72.4 30’ 8-1/4” 590 10,030

8,000 72.4 38’ 11-1/4” 748 12,207

10,000 93-11/16 29’ 9-7/8” 741 12,099

12,000 93-11/16 37’ 2-3/8” 924 14,479

15,000 93-11/16 44’ 6-3/4” 1,106 16,795

18,000 108 41’ 5” 1,186 17,796

30,000 108 65’ 9-1/2” 1,884 26,602

30,000 130 46’ 9-1/2” 1,616 22,926

TankGallons

Tank I.D. Inches O.A.L

OutsideSurface

Area sq. ft.

RequiredFlow

SCFM/AIR

35,000 130 1/4” 54’ 0” 1,865 25,786

40,000 130 1/4” 61’ 2-1/2” 2,114 28,577

45,000 130 1/4” 68’ 5” 2,363 31,309

50,000 130 1/4” 75’ 7-1/2” 2,612 33,999

55,000 130 1/4” 82’ 10” 2,861 36,625

60,000 130 1/4” 90’ 0-1/2” 3,110 39,219

65,000 130 1/4” 97’ 3” 3,359 41,775

70,000 130 1/4” 104’ 5-1/2” 3,607 44,288

75,000 130 1/4” 111’ 8” 3,856 46,780

80,000 130 1/4” 118’ 10-1/2” 4,105 49,243

85,000 130 1/4” 126’ 1” 4,354 51,679

90,000 130 1/4” 133’ 3-1/2” 4,603 54,091

SET 250 PSIGCAP

42

Rate of Discharge for LP-Gas Pressure Relief Valves Used on ASME ContainersMinimum required rate of discharge in cubic feet per minute of air for relief valves to be used on containers other than those con-structed in accordance with Interstate Commerce Commission specification.

Typical Tank Data Plate

Relief Valve Sizing for Common Domestic ASME Tanks

The relief valves used for protection on ASME storage containers have a minimum required flow rate determined by the outside surface area of the container.The following chart lists the common domestic ASME storage containers, their re-quired relief flow rates and their associated relief valves.

TankGallons

OutsideSurface

Area sq. ft.

RequiredFlow

SCFM/AIR

StandardRelief Valve

ReliefValve

Pipe Size

Relief ULFlow Rate

SCFM/AIR

120 39 1078

7583G 3/4” 1980150 48 1286

250 62 1580

325 79 1930

500 98 2300 8684G 1” 2620

1000 174 3684 8685G 1-1/4” 4385

Relief Valves

250 P.S.I. @ 125 OF INSP.STAMP

VARIOUS

AG 1989

37.42" 0.291" 0.210" 118.75"

4,167500

97 HEMI

80%

NATIONAL BOARD NO.

MAX. ALLOWABLEWORKING PRESSURE

O.S. SURFACEAREA S.F.

WATERGALS.

O.S. DIATHIS CONTAINER SHALL NOT CONTAIN A PRODUCT HAVING

A VAPOR PRESSURE IN EXCESS OF 215 PSI AT 100 OF

TYPE YR. BUILT D.T.

SHELL THK. HEAD THK. LENGTH

WATERLBS.

D.R.

MODEL

MFG. SERIAL NO.

UNO NAME TANK COMPANY

From NFPA Pamphlet #58.

Surface area = Total outside surface area of container in square feet.Flow Rate CFM Air = Required flow capacity in cubic feet per minute of air at standard conditions, 60OF and atmospheric pressure (14.7 psia).

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

SurfaceArea

Sq. Ft.

FlowRateCFMAir

20 or less 626 85 2050 150 3260 230 4630 360 6690 850 13540 1500 21570

25 751 90 2150 155 3350 240 4800 370 6840 900 14190 1550 22160

30 872 95 2240 160 3440 250 4960 380 7000 950 14830 1600 22740

35 990 100 2340 165 3530 260 5130 390 7150 1000 15470 1650 23320

40 1100 105 2440 170 3620 270 5290 400 7300 1050 16100 1700 2390

45 1220 110 2530 175 3700 280 5450 450 8040 1100 16720 1750 24470

50 1330 115 2630 180 3790 290 5610 500 8760 1150 17350 1800 25050

55 1430 120 2720 185 3880 300 5760 550 9470 1200 17960 1850 25620

60 1540 125 2810 190 3960 310 5920 600 10170 1250 18570 1900 26180

65 1640 130 2900 195 4050 320 6080 650 10860 1300 19180 1950 26750

70 1750 135 2990 200 4130 330 6230 700 11550 1350 19780 2000 27310

75 1850 140 3080 210 4300 340 6390 750 12220 1400 20380

80 1950 145 3170 220 4470 350 6540 800 12880 1450 20980

43

Relief Valves

Brass Hydrostatic Relief Valves

3127

Pipeaway

Stainless Steel Hydrostatic Relief Valves

SS8001 SS8021

Designed especially for the protection of piping and shutoff valves where there is the possibility of trapping LP-Gas.They may be installed in pipelines and hoses located between shutoff valves or in the side boss of RegO shutoff valves.

TypicalInstallation

Designed especially for the protection of piping and shutoff valves where there is the possibility of trapping liquid.They may be installed in pipelines and hoses located between shutoff valves or in the side boss of RegO shutoff valves.

SS8001 and SS8002 bodies have no discharge threads.

SS8021 and SS8022 bodies have discharge threads.

PartNumber

InletConnec-

tion

Start ToDischargePressure

ProtectiveCap

3127G

1/4” MNPT

250 PSIG

9103-54or

7545-40

3127H 275 PSIG

3127J 350 PSIG

3127K 375 PSIG

3127L 400 PSIG

3125L 400 PSIG 3125-40P

3127T 312 PSIG 9103-54or

7545-403127U 450 PSIG

PartNumber

InletConnec-

tion

Start ToDischargePressure

Protec-tiveCap

PipeawayThreads

SS8002G

1/2” MNPT

250 PSIG

8022-54

-----

SS8022G 3/8” FNPT

SS8002J350 PSIG

-----

SS8022J 3/8” FNPT

SS8002L400 PSIG

-----

SS8022L 3/8” FNPT

SS8002U450 PSIG

-----

SS8022U 3/8” FNPT

PartNumber

InletConnec-

tion

Start ToDischargePressure

Protec-tiveCap

PipeawayThreads

SS8001G

1/4” MNPT

250 PSIG

8001-54

-----

SS8021G 1/4” NPSM

SS8001J350 PSIG

-----

SS8021J 1/4” NPSM

SS8001L400 PSIG

-----

SS8021L 1/4” NPSM

SS8001U450 PSIG

-----

SS8021U 1/4” NPSM

The 3125L is a compact design for cramped space installations.

PartNumber

InletConnec-

tion

Start ToDischargePressure

Protec-tiveCap

Pipeaway Adapter

Part Number Size

3129G

1/2”MNPT

250 PSIG 3129-40PCap

or

7545-40as aPlug

3129-10 1/2” FNPT

3129J 350 PSIG

3129K 375 PSIG

3129L 400 PSIG

3129U 450 PSIG

44

Caps For Internal Relief Valves on Domestic Tanks

Relief Valve Caps

Caps For External Relief Valves Caps For Forklift Relief ValvesThese caps fit over the deflec-tion elbow threaded into the relief valve.

8545AK

Shower Cap Style

Part No Used On

85 1/2” and 3/4” Valves

85A 3/4” thru 1-1/4” Valves

Flip TopWeather Caps

Part NoFits OverNPT Size

ClampingRange (inches)

WC0 3/4” 1 to 1-3/16

WC1 1” 1-1/4 to 1-7/16

WC2 1-1/4” 1-1/2 to 1-11/16

WC3 1-1/2” 1-3/4 to 1-15/16

WC5 2” 2-1/4 to 2-7/16

WC8 2-1/2” 3 to 3-3/16

WC10 3” 3-1/2 to 3-11/16

WC14 4” 4-1/2 to 4-11/16DO

NOT

REMOVE

COVER

RELIEF

VALVE

85A

CAUTION

R3100-54

7583-40 Capon 7583G

3131-54 Capon 7583G

8684-40 Capon 8684G

3131-54 Capon 8684G

7585-40X Capon 8685G

3132-54 Capon 8685G

Caps with rings (included with new relief valve) Yellow closure caps

8545AK

This cap fits directly over the forklift relief valve.

CapPart No

ReliefOD

Used OnRegO #

3125-40P 5/8” 3125 1/4” NPT

8001-54 3/4” SS8001 1/4” NPT

9103-54 7/8” 3127 1/4” NPT

8022-54 1” SS8002 1/2” NPT

3129-40P 1-1/8” 3129 1/2” NPT

3131-54 1-3/4” 3131 3/4” NPT

3132-54 2-11/32” 3132 1-1/4” NPT

3135-54 2-3/4” 3135 1-1/4” NPT

3133-54 3-1/8” 3133 1-1/2” NPT

7545-40 Can be used as a plug on3129 1/2” NPT

9103-54

R

7545-40

R

R

R

1-1/

4” R

elie

f10

00 G

al T

anks

1-1/

4” R

elie

f10

00 G

al T

anks

1” R

elie

f50

0 G

al T

anks

1” R

elie

f50

0 G

al T

anks

3/4”

Rel

ief

Smal

l Tan

ks

3/4”

Rel

ief

Smal

l Tan

ks