4820-00-120-8768

Find complete technical information, availability, and procurement data for: 4820-00-120-8768
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-120-8768

Item Name Code

05488

Assigment Date

10/25/1968 (57 years ago)

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.

threaded bonnet attachment method, right-hand 1st end thread direction, 3a 1st end thread class, inside spring bonnet type, poppet flow control device

Product Characteristics

Below you’ll find the complete technical specifications and performance data for this part, including material details and compliance information.

Thread Class: 3a 1st end
Thread Direction: right-hand 1st end
Flow Control Device: poppet
Bonnet Type: inside spring
Bonnet Attachment Method: threaded
Disk Loading Method: spring
Valve Discharge Flow Rate: 4.5 cubic feet per minute
Connection Style: flared (tube) 1st end
Connection Type: threaded external tube 1st end
Features Provided: valve stem lock shield and pressure tight outlet side
Thread Quantity Per Inch: 20 1st end
Adjustable Pressure Range: +21.0 to 23.0 pounds per square inch
Maximum Operating Pressure: 27.0 pounds per square inch single response
Nominal Thread Size: 0.437 inches 1st end
Seat Angle: 37.0 degrees 1st end
Nominal Outside Diameter Tube Accommodated: 0.250 inches 1st end
Material: aluminum alloy seat
Material: aluminum alloy body
Material: plastic polytetrafluoroethylene body lining
Media For Which Designed: air single response
Surface Treatment: anodize
Style Designator: safety relief
Thread Series Designator: unf 1st end

Related Parts

This NSN group includes multiple components designed to meet specific performance and operational standards. Each listing provides detailed specs, functionality data, and replacement compatibility information:

Part Number	Name
2394281-1	Safety Relief Valve

FAQs

Find helpful answers about installation, operation, maintenance, compliance, and troubleshooting.

What is the FSCG of the NSN 4820-00-120-8768?

The FSCG of the NSN 4820-00-120-8768 is 4820

Does the NSN 4820-00-120-8768 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-120-8768 require demilitarization?

"commerce control list items (ccli) - mut to the point of scrap required outside the united states. Inside the united states, mut is required when the demil integrity code (ic) is "3" and mut is not required when the demic is "6" (note 8)"

Does NSN 4820-00-120-8768 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-00-120-8768 contain hazardous materials?

Indicates there is no data in the hmirs and the nsn is in a fsc not generally suspected of containing hazardous materials.

When the NSN 4820-00-120-8768 was assigned to the Federal Catalog?

It was assigned 57 years ago, on Fri, Oct 25, 1968