1384 X P/L4143-

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-236-5972

Item Name Code

05488

Assigment Date

07/18/1986 (40 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, inside spring bonnet type, bolted renewable seat ring type, union bonnet attachment method, 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.

Flow Control Device: disk
Bonnet Type: inside spring
Bonnet Attachment Method: union
Disk Loading Method: spring
Renewable Seat Ring Type: bolted
Maximum Operating Temp: 180.0 fahrenheit single response
Connection Style: socket with brazing ring (tube) all ends
Valve Operation Method: automatic
Connection Type: unthreaded internal tube all ends
Adjustable Pressure Range: +12.0 to 25.0 pounds per square inch
Maximum Operating Pressure: 300.0 pounds per square inch single response
Material: copper alloy body
Material: nickel alloy stem
Material: rubber synthetic seat
Material Document And Classification: astm b61 assn std single material response body
Material Document And Classification: qq-n-281,class a fed spec single material response stem
Style Designator: angle
Furnished Items And Quantity: 1 lever and 2 nut and 2 tailpiece

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-01-262-6165	No Name Available	08/01/2020
4820-01-345-3824	No Name Available	04/01/2001

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
1384 X P/L4143-	Safety Relief Valve
1385 B/M 2385E222	Safety Relief Valve
C3459XP/L4143-12T25PSI	Safety Relief Valve
YB2385E222	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-236-5972?

The FSCG of the NSN 4820-01-236-5972 is 4820

Does the NSN 4820-01-236-5972 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-236-5972 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 4820-01-236-5972 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-236-5972 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 4820-01-236-5972 was assigned to the Federal Catalog?

It was assigned 40 years ago, on Fri, Jul 18, 1986