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Safety Relief Valve NSN 4820-01-256-8744

Item Description

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.

NSN 4820-01-256-8744 NSN: 4820-01-256-8744

Features and Characteristics

Flow Control Device
Disk
Disk Loading Method
Spring
Valve Discharge Flow Rate
128.0 cubic feet per minute
Maximum Operating Pressure
400.0 pounds per square inch single response
Criticality Code Justification
Zzzy
Opening Pressure Setting
80.0 pounds per square inch
Material
Nickel alloy 400 stem
Material Specification
Qq-n-281 federal specification single material response stem
Media For Which Designed
Oxygen, liquid single response
Style Designator
Err-090
Reference Number Differentiating Characteristics
Requires special cleaning and packaging iaw mil-c-52211, for oxygen/nitrogen/hydrogen service
FSC
4820 Nonpowered Valves
NIIN
012568744
NSN
4820012568744

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
UU-1551-T
Cage Code:
15187
Status:
A
MSDS:
Part Number:
D841-4050
Cage Code:
96101
Status:
A
MSDS:
Part Number:
9955.K 5IM,TYPE
Cage Code:
96101
Status:
A
MSDS:
Part Number:
D841-4050CP
Cage Code:
03950
Status:
A
MSDS:
Part Number:
UU-1551-TCP
Cage Code:
03950
Status:
A
MSDS:

Foreign Trade & Schedule B

What is a Schedule B number? Find more information at help.cbp.gov
  • Schedule B Number: 8481400000
  • NAICS: 332911
  • SITC: 74740
  • Description: Safety or relief valves
  • End Use (Code 21180):
    Industrial machines, other

Q & A

Frequently asked questions for NSN 4820-01-256-8744
What are the manufacturers of nsn 4820012568744?
Does this nsn 4820012568744 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 4820012568744
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.
Does nsn 4820012568744 contain any precious metals?
No precious metal content.
Does nsn 4820012568744 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 4820012568744?
No known electrostatic discharge.

Identification Group

Item Identification Guide (IIG) and Item Name Code (INC)
INC
FIIG
App. Key
Cond. Code
Status
INC:
05488
FIIG:
A046B0
App. Key:
AP
Cond. Code:
1
Status:
A

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  •   On Time Delivery
  •   Certificate of Conformance
  •   Quality Inspected Parts
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