20-1 1.50IPS 45PSI

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-338-6415

Item Name Code

05488

Assigment Date

05/08/1991 (35 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.

1.500 inches 2nd end nominal pipe size accommodated, right-hand 1st end thread direction, spring disk loading method, disk flow control device, 300.0 fahrenheit single response maximum operating temp

Product Characteristics

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

Nominal Pipe Size Accommodated: 1.500 inches 2nd end
Thread Direction: right-hand 1st end
Flow Control Device: disk
Disk Loading Method: spring
Maximum Operating Temp: 300.0 fahrenheit single response
Connection Style: plain (pipe) 1st end
Connection Style: plain,optional end(pipe) 2nd end
Valve Operation Method: automatic
Connection Type: threaded internal pipe 1st end
Connection Type: unthreaded internal pipe 2nd end
Maximum Operating Pressure: 1200.0 pounds per square inch single response
Nominal Thread Size: 1.500 inches 1st end
Opening Pressure Setting: 45.0 pounds per square inch
Material: copper alloy body
Media For Which Designed: liquid single response
Style Designator: angle
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
20-1 1.50IPS 45PSI	Safety Relief Valve
C13373-20-1 1.50IPS	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-338-6415?

The FSCG of the NSN 4820-01-338-6415 is 4820

Does the NSN 4820-01-338-6415 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-338-6415 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 4820-01-338-6415 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-338-6415 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 4820-01-338-6415 was assigned to the Federal Catalog?

It was assigned 35 years ago, on Wed, May 8, 1991