MODEL NO. 81M-3 3IN

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-204-5223

Item Name Code

05487

Assigment Date

03/27/1985 (41 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.

disk flow control device, flange 1st end connection type, automatic valve operation method, 3.000 inches valve size, round with holes 1st end flange shape

Product Characteristics

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

Flow Control Device: disk
Valve Operation Method: automatic
Flange Shape: round with holes 1st end
Connection Type: flange 1st end
Valve Size: 3.000 inches
Maximum Operating Pressure: 250.0 pounds per square inch single response
Nominal Outside Diameter: 6.625 inches 1st end
Nominal Thickness: 0.938 inches 1st end
Bolt Hole Nominal Diameter: 0.562 inches 1st end
Bolt Circle Nominal Diameter: 5.500 inches 1st end
Media For Which Designed: water, salt single response
Style Designator: straight thru flanged ends

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
81M-3 AND 10315	Check Valve
MODEL NO. 81M-3 3IN	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-204-5223?

The FSCG of the NSN 4820-01-204-5223 is 4820

Does the NSN 4820-01-204-5223 have a Schedule B code assigned?

Yes, the Schedule B code is 8481301090

Does NSN 4820-01-204-5223 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 4820-01-204-5223 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-204-5223 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 4820-01-204-5223 was assigned to the Federal Catalog?

It was assigned 41 years ago, on Wed, Mar 27, 1985