610-497-2600

MODEL 537 SAFETY RELIEF VALVE

Features

• Extra heavy construction helps provide long life.
• Top guided disc assembly incorporates resilient seal in seating area.
• Isolating diaphragm protects working parts from corrosion caused by discharged liquid.
• Pivot between disc and spring designed to correct misalignment and compensates for spring side thrust.
• Heavy duty lift lever.
• Tested and inspected for pressure setting and leakage.

GENERAL APPLICATION

These valves serve the dual purpose of relieving overpressure created by thermal expansion under normal firing conditions and overpressure in the form of water or steam created in over-firing due to failure of electrical or other controls on hot water boilers, heat exchangers and generators.

TECHNICAL DATA

Connections:FNPT
Temperature range:-20° to 250°F (-29° to 121°C)
Pressure range:15 to 160 psig (1.0 to 11 barg)
Code:ASME IV

PARTS AND MATERIALS

No.Part NameMaterials
1Body[1]
2Seat o-ringNBR[2]
3SeatBronze, B584 alloy 84400[2]
4Disc holder Insert Diaphragm Guide Lock nutBrass, B16[3] Ethylene propylene (EPDM) NBr/nylon Brass, B36 alloy C26000[4] Brass, B16
5ScrewSS
6SpringSS, A313-631
7Bonnet[1]
8Spring stepBrass, B16
9Compression screwBrass, B16
10LeverSteel, zinc plated
11Seal and wireLead seal and SS wire
12Lift washer nutSS
13Lift washerSS
14Stem Spring pin Disc locknutSS, A479-316 SS Brass

NOTES

1. ¾” and 1”: bronze, B584 alloy 84400.
    1½” and 2”: cast iron, a126 class a/B.
2. ¾” and 1″ sizes have an integral seat. 1½” and 2″ sizes have an insert seat
    above a NBr o-ring body seal.
3. 1½” size: brass, B283 alloy 37700.
    2″ size: bronze, B584 alloy 84400.
4. ¾” size: brass, B16.

SPECIFICATIONS

SizeDimensions (in)Weight
InletOutletABC(lb)
¾”1”15/161⅞6⅛2
1”1¼”1 5/162⅜7⅛5
1½”2”25/1610⅛12
2”2½”2⅛39/1611¾22

Capacities

ASME SECTION IV STEAMM (Hot water boiler)

Orificearea,in2
¾”1”1½”2”
Set pressure(0.533 in2)(0.833 in2)(1.767 in2(3.142in2
(psig)lb/hBTU/hlb/hBTU/hlb/hBTU/hlb/hBTU/h
15690690278107910788022288228840840694069144
20812811962126912689762692269181347864786461
3010551055329164916493233499349862362216221095
4012991298696203020296704305430543476567655729
5015421542064241024100175112511224490909090363
601785178543127902790364591959190551052510524997
702029202879831713170711672667258651196011959631
802275227216535513551058753375326761339413394265
902516251553339313931405833983394861482914828899
1002759275890043124311752914691462961626416263533
1103002300226746924692098995399531071769817698167
120324632456345072507244510760107599171913319132801
125336733673185263526261911163111633231985019850119
130348934890025453545279211567115667282056720567436
140373237323695833583313912374123735382200222002070
150397639757366213621348613180131803492343723436704
160421942191036594659383313987139871592487124871338

SELECTION GUIDE

Example:0537-D01-HM0160
Model
0537
Connection size

D       ¾" inlet x 1” outlet

E       1" inlet x 1¼” outlet

G       1½" inlet x 2” outlet

H2" inlet x 2½” outlet
Variation

01       Catalog standard
Design revision

Indicates non-interchangeable revision

-       Original design (connection sizes E, G and H)

A       Revision A (connection size D)
Service

H       Steam ASME section IV - hot water
Spring material

M       SST
Set pressure

0015       15 psig

0160       160 psig
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