Model: 9979B51M

Safety Relief Valve

Properties:

Pipe Size Accommodated
0.375 inches 2nd end
Pipe Size Accommodated
1.250 inches 1st end
Flow Control Device
Disk
Disk Loading Method
Spring
Maximum Operating Temp
150.0 degrees fahrenheit single response
End Application
Forrestal class cv
Valve Operation Method
Manual
Connection Type
Unthreaded internal pipe all ends
Adjustable Pressure Range
+1401.0/+1800.0 pounds per square inch
Maximum Operating Pressure
3000.0 pounds per square inch single response
Criticality Code Justification
Zzzy
Opening Pressure Setting
1401.0 pounds per square inch
Material
Copper alloy 922 body
Material
Nickel alloy 400 seat or nickel alloy r-405 seat
Material
Nickel alloy 400 stem or nickel alloy r-405 stem
Material Specification
Astm b61 assn standard single material response body
Material Specification
Qq-n-281 federal specification single material response seat
Material Specification
Qq-n-281 federal specification single material response stem
Furnished Items And Quantity
2 tailpiece and 1 plugged drain and 1 wrench
Reference Number Differentiating Characteristics
Requires special cleaning and packaging iaw mil-c-52211, for oxygen/nitrogen/hydrogen service
NSN
4820-01-284-4242
Part Number
9979B51M
Description
Valve,safety Relief
CAGE
15187

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 9979B51M NSN 4820-01-284-4242

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:
A
ESD:
ESD:
MMAC:
CRITL:
Y

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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