6-1-1910-20-264

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-933-5987

Item Name Code

27828

Assigment Date

09/09/1966 (59 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.

weight disk loading method, threaded renewable seat ring type, plain, optional end (pipe) all ends connection style, automatic valve operation method, right-hand all ends thread direction

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
Disk Loading Method: weight
Renewable Seat Ring Type: threaded
Connection Style: plain, optional end (pipe) all ends
Valve Operation Method: automatic
Connection Type: threaded internal pipe all ends
Mounting Position: horizontal
Maximum Operating Pressure: 200.0 pounds per square inch 1st response
Maximum Operating Pressure: 400.0 pounds per square inch 2nd response
Special Features: renewable plug type discs; valve should be installed with pressure underthe discs
Material: copper alloy body
Material: nickel alloy flow control device
Material: nickel and copper alloy seat
Material Document And Classification: astm b-61 assn std single material response body
Material Document And Classification: astm b-64 class b assn std single material response flow control device
Material Document And Classification: astm wpc alloy no.56 assn std single material response seat
Media For Which Designed: steam 1st response
Media For Which Designed: water-oil-gas 2nd response
Style Designator: straight thru
Supplementary Features: flow control device: plug
Thread Series Designator: npt all 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
6-1-1910-20-264	Lift-Check Valve
FIG54-1/4X2-1/8X1-13/32	Lift-Check Valve
FIG99A	Lift-Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-933-5987?

The FSCG of the NSN 4820-00-933-5987 is 4820

Does NSN 4820-00-933-5987 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 4820-00-933-5987 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-933-5987 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 4820-00-933-5987 was assigned to the Federal Catalog?

It was assigned 59 years ago, on Fri, Sep 9, 1966