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Safety Relief Valve NSN 4820-00-166-8791

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 4820-00-166-8791 NSN: 4820-00-166-8791

Features and Characteristics

Pipe Size Accommodated
0.500 inches all ends
Flow Control Device
Disk
Bonnet Type
Inside spring
Bonnet Attachment Method
Threaded
Disk Loading Method
Spring
Valve Discharge Flow Rate
101.0 cubic feet per minute
Maximum Operating Temp
400.0 degrees fahrenheit single response
Connection Style
Socket all ends
Valve Operation Method
Automatic
Connection Type
Unthreaded internal pipe all ends
Features Provided
Pressure tight outlet side
Adjustable Pressure Range
+46.0/+72.0 pounds per square inch
Maximum Operating Pressure
400.0 pounds per square inch single response
Opening Pressure Setting
72.0 pounds per square inch
Material
Nickel alloy flow control device and plastic polytetrafluoroethylene flow control device
Material Specification
Qq-n-281 federal specification 1st material response stem or qq-n-288 federal specification 2nd material response stem
Media For Which Designed
Air single response
Style Designator
Angle
Test Data Document
81349-mil-s-901 specification (includes engineering type bulletins, brochures, etc., that reflect specification type data in specification format; excludes commercial catalogs, industry directories, and similar trade publications, reflecting general type data on certain environmental and performance requirements and test conditions that are shown as "typical", "average", "", etc.).
Furnished Items And Quantity
2 nut and 1 lever and 2 tailpiece
Specification Data
81349-mil-v-22549 government specification
FSC
4820 Nonpowered Valves
NIIN
001668791
NSN
4820001668791

Manufacturer Part Numbers

Part numbers registered to this national stock number.
Part Number
Cage
Status
MSDS
Part Number:
MIL-V-22549
Cage Code:
81349
Status:
A
MSDS:
Part Number:
MIL-V-22549G1-2 400-46T072SBU
Cage Code:
03950
Status:
A
MSDS:
Part Number:
20274K51M
Cage Code:
01343
Status:
A
MSDS:
Part Number:
20274K51MC1D883116768
Cage Code:
15187
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 4820-00-166-8791
What are the manufacturers of nsn 4820001668791?
Does this nsn 4820001668791 have a shelf life?
No. This NSN does not have an applicable shelf life.
What is the formal definition of nsn 4820001668791
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 4820001668791 contain any precious metals?
Precious metal content is unknown.
Does nsn 4820001668791 contain any hazardous materials?
No MSDS. No hazardous material.
What is the ESD classification of nsn 4820001668791?
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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