4820-00-068-8991

Find complete technical information, availability, and procurement data for: 4820-00-068-8991
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-068-8991

Item Name Code

05488

Assigment Date

01/01/1963 (63 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.

packing retaining bonnet type, spring disk loading method, right-hand 1st end thread direction, 3b 1st end thread class, 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: 3b 1st end
Thread Direction: right-hand 1st end
Flow Control Device: poppet
Bonnet Type: packing retaining
Disk Loading Method: spring
Valve Discharge Flow Rate: 4.0 cubic feet per minute
Maximum Operating Temp: -65.0 fahrenheit 1st response
Maximum Operating Temp: 275.0 fahrenheit 2nd response
Connection Style: gasket seal(boss) 1st end
Valve Operation Method: automatic
Connection Type: threaded internal boss 1st end
Features Provided: pressure tight outlet side
Adjustable Pressure Range: +49.0 to 51.0 pounds per square inch
Maximum Operating Pressure: 50.0 pounds per square inch single response
Nominal Thread Size: 0.562 inches 1st end
Material: aluminum alloy overall
Media For Which Designed: hydraulic fluid, phosphate-ester base single response
Surface Treatment: anodize
Style Designator: straight thru
Thread Series Designator: unjf 1st end

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
1650-00-083-1240	No Name Available	01/01/1960

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
128SCH107-1	Safety Relief Valve
MC1665	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-068-8991?

The FSCG of the NSN 4820-00-068-8991 is 4820

Does the NSN 4820-00-068-8991 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-068-8991 require demilitarization?

Items subject to the export administration regulations (ear) in parts 730-774 of title 15, code of federal regulations (cfr) (ccli or ear99) and determined by dod to present a low risk when released out of dod control. No demil, mut, or end use certificate is required. May require an export licensefrom doc.

Does NSN 4820-00-068-8991 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-068-8991 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 4820-00-068-8991 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963