20318 ASSY 20318

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-363-2100

Item Name Code

05488

Assigment Date

08/26/1992 (33 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, 425.0 fahrenheit 1st response150.0 fahrenheit 2nd response maximum operating temp, automatic valve operation method, 6 all ends bolt hole quantity, round with holes all ends 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
Bolt Hole Quantity: 6 all ends
Maximum Operating Temp: 425.0 fahrenheit 1st response150.0 fahrenheit 2nd response
Valve Operation Method: automatic
Flange Shape: round with holes all ends
Connection Type: flange all ends
Valve Size: 1.500 inches
Maximum Operating Pressure: 150.0 pounds per square inch 1st response250.0 pounds per square inch 2nd response
Nominal Outside Diameter: 5.062 inches all ends
Nominal Thickness: 0.812 inches all ends
First Connection Face To Centerline Distance: 4.750 inches
Bolt Hole Nominal Diameter: 0.562 inches all ends
Second Connection Face To Centerline Distance: 4.750 inches
Bolt Circle Nominal Diameter: 3.938 inches all ends
Flange Face Design: plain all ends
Material: copper alloy bodynickel alloy flow control devicenickel alloy seatnickel alloy stem
Media For Which Designed: steam 1st responsewater-oil-gas 2nd response
Style Designator: angle 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
20318 ASSY 20318	Safety Relief Valve
20318 ASSY 20318QS41M	Safety Relief Valve
20318QS41M	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-363-2100?

The FSCG of the NSN 4820-01-363-2100 is 4820

Does the NSN 4820-01-363-2100 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-363-2100 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 4820-01-363-2100 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-363-2100 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 4820-01-363-2100 was assigned to the Federal Catalog?

It was assigned 33 years ago, on Wed, Aug 26, 1992