Model: 637-9 3-4

Safety Relief Valve

Properties:

Pipe Size Accommodated
0.750 inches all ends
Thread Direction
Right-hand all ends
Flow Control Device
Poppet
Bonnet Type
Inside spring
Bonnet Attachment Method
Integral
Disk Loading Method
Spring
Maximum Operating Temp
225.0 degrees fahrenheit single response
Connection Style
G9 plain, optional en (pipe) all ends
Connection Style
Plain, optional en (pipe) all ends
Valve Operation Method
Automatic
Connection Type
Threaded internal pipe all ends
Features Provided
Valve stem lock shield and bonnet packing and pressure tight outlet side
Thready Qty Per Inch (tpi)
14 all ends
Adjustable Pressure Range
+800.0/+1500.0 pounds per square inch
Maximum Operating Pressure
3100.0 pounds per square inch single response
Thread Size
0.750 inches all ends
Opening Pressure Setting
1000.0 pounds per square inch
Material
Copper alloy seat
Material
Copper alloy body
Material
Stainless steel flow control device
Material
Stainless steel stem
Media For Which Designed
Water-oil-gas single response
Style Designator
Angle
Thread Series Designator
Npt all ends
NSN
4820-00-593-2233
Part Number
637-9 3-4
Description
Valve,safety Relief
CAGE
86768

A valve designed to automatically release excessive pressures. It is actuated by static pressure upstream of the valve and is used as a safety valve or relief valve, and may be set to close at a predetermined pressure. It is not designed for regulation of continuously fluctuating loads. It may be inline or cartridge (manifold) design. Excludes valve (1), relief, pressure and temperature.

Part 637-9 3-4 NSN 4820-00-593-2233

INC
FIIG
Concept No.
App. Key
Cond. Code
Status
INC:
05488
FIIG:
A046B0
Concept No.:
1
App. Key:
AP
Cond. Code:
1
Status:
A

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators
HMIC
PMIC
ESD/EMI
ENAC
MMAC
CRITL
HMIC:
N
PMIC:
U
ESD:
ESD:
MMAC:
CRITL:
X

Freight Classification

NMFC
UFC
LTL
LCL
WCC
TCC
SHC
ACC
NMFC:
127220
UFC:
64490
LTL:
77.5
LCL:
77.5
WCC:
594
TCC:
Z
SHC:
9
ACC:
Trailers/Vehicles

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Schedule B and Export
  • Schedule B: 8481400000
  • SITC: 74740
  • End Use: Industrial machines, other
  • NAICS: 332911
  • USDA: 1

Freight Class: Safety or relief valves

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