81312S41-589PC89

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-091-7887

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.

automatic valve operation method, plain,optional end(pipe) all ends connection style, right-hand all ends thread direction, stem flow control device, threaded internal pipe all ends connection type

Product Characteristics

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

Thread Direction: right-hand all ends
Flow Control Device: stem
Connection Style: plain,optional end(pipe) all ends
Valve Operation Method: automatic
Connection Type: threaded internal pipe all ends
Nominal Thread Size: 0.750 inches all ends
Material: copper alloy overall
Style Designator: angle
Thread Series Designator: npt all ends

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-00-289-3898	No Name Available	04/01/1989

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
64-8-2929	Safety Relief Valve
81312S41-589PC89	Safety Relief Valve
81312S41-667PC89	Safety Relief Valve
81312S41-785PC89	Safety Relief Valve
HR5558	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-091-7887?

The FSCG of the NSN 4820-00-091-7887 is 4820

Does the NSN 4820-00-091-7887 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-091-7887 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 4820-00-091-7887 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-091-7887 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 4820-00-091-7887 was assigned to the Federal Catalog?

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