4820-00-491-4993

Find complete technical information, availability, and procurement data for: 4820-00-491-4993
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-491-4993

Item Name Code

05488

Assigment Date

06/13/1969 (57 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.

-100.0 fahrenheit 1st response maximum operating temp, right-hand 1st end thread direction, poppet flow control device, 450.0 fahrenheit 2nd response maximum operating temp, spring disk loading method

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 1st end
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: -100.0 fahrenheit 1st response
Maximum Operating Temp: 450.0 fahrenheit 2nd response
Connection Style: plain (pipe) 1st end
Valve Operation Method: automatic
Connection Type: threaded external pipe 1st end
Thread Quantity Per Inch: 27 1st end
Adjustable Pressure Range: +0.0 to 200.0 pounds per square inch
Maximum Operating Pressure: 200.0 pounds per square inch single response
Nominal Thread Size: 0.250 inches 1st end
Opening Pressure Setting: 11.0 pounds per square inch
Material: steel comp 303 overall
Material Document And Classification: 66 fed std single material response overall
Media For Which Designed: water-oil-gas single response
Style Designator: straight thru
Thread Series Designator: npt 1st end

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
520T-2M-11	Safety Relief Valve
532066-1	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-491-4993?

The FSCG of the NSN 4820-00-491-4993 is 4820

Does the NSN 4820-00-491-4993 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-491-4993 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 4820-00-491-4993 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-491-4993 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 4820-00-491-4993 was assigned to the Federal Catalog?

It was assigned 57 years ago, on Fri, Jun 13, 1969