1856M-OL/SP .50X.75IPS 30T39PSI

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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-273-1034

Item Name Code

05488

Assigment Date

02/19/1988 (38 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.

plain,optional end(pipe) 2nd end connection style, disk flow control device, 450.0 fahrenheit single response maximum operating temp, plain (pipe) 1st end connection style, 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
Maximum Operating Temp: 450.0 fahrenheit single 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
Adjustable Pressure Range: +30.0 to 39.0 pounds per square inch
Nominal Thread Size: 0.500 inches 1st end
Nominal Thread Size: 0.750 inches 2nd end
Material: copper alloy body
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
1856M-OL/SP .50X.75IPS 30T39PSI	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-273-1034?

The FSCG of the NSN 4820-01-273-1034 is 4820

Does the NSN 4820-01-273-1034 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-273-1034 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 4820-01-273-1034 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-273-1034 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 4820-01-273-1034 was assigned to the Federal Catalog?

It was assigned 38 years ago, on Fri, Feb 19, 1988