Model: 645B-4-12-2

Safety Relief Valve

Properties:

Thread Direction
Right-hand 1st end
Disk Loading Method
Spring
Maximum Operating Temp
-65.0 degrees fahrenheit 1st response
Maximum Operating Temp
225.0 degrees fahrenheit 2nd response
Connection Type
Threaded internal tube 1st end
Features Provided
Pressure tight outlet side
Thready Qty Per Inch (tpi)
12 1st end
Maximum Operating Pressure
200.0 pounds per square inch single response
Thread Size
1.500 inches 1st end
Opening Pressure Setting
200.0 pounds per square inch
Outside Diameter Tube Accommodated
0.750 inches 1st end
Material
Stainless steel body
Material
Stainless steel seat
Media For Which Designed
Fuel/oil, hydrocarbon single response
Style Designator
Angle
Thread Series Designator
Un 1st end
NSN
4820-00-942-9134
Part Number
645B-4-12-2
Description
Valve,safety Relief
CAGE
09990

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 645B-4-12-2 NSN 4820-00-942-9134

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

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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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