4820-00-202-7481

Find complete technical information, availability, and procurement data for: 4820-00-202-7481
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-202-7481

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.

300.0 fahrenheit 1st response maximum operating temp, disk flow control device, spring disk loading method, retaining screw renewable seat ring type, 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
Flow Control Device: disk
Disk Loading Method: spring
Renewable Seat Ring Type: retaining screw
Maximum Operating Temp: 300.0 fahrenheit 1st response
Maximum Operating Temp: 406.0 fahrenheit 2nd response
Connection Style: plain (pipe) 1st end
Connection Style: plain,optional end(pipe) 2nd end
Valve Operation Method: automatic or manual
Connection Type: threaded external pipe 1st end
Connection Type: threaded internal pipe 2nd end
Features Provided: pressure tight outlet side
Maximum Operating Pressure: 1200.0 pounds per square inch 1st response
Maximum Operating Pressure: 250.0 pounds per square inch 2nd response
Nominal Thread Size: 0.750 inches all ends
Opening Pressure Setting: 350.0 pounds per square inch
Material: copper alloy overall
Media For Which Designed: air 1st response
Media For Which Designed: steam 2nd response
Style Designator: angle
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
23-M 3/4 350PSI	Safety Relief Valve
M23A	Safety Relief Valve
M23MA	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-202-7481?

The FSCG of the NSN 4820-00-202-7481 is 4820

Does the NSN 4820-00-202-7481 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-202-7481 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 4820-00-202-7481 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-202-7481 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 4820-00-202-7481 was assigned to the Federal Catalog?

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