4820-00-139-3931

Find complete technical information, availability, and procurement data for: 4820-00-139-3931
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-139-3931

Item Name Code

16996

Assigment Date

08/18/1971 (54 years ago)

A valve designed to release under excessive pressure and/or excessive temperature by opening at a predetermined pressure and/or temperature. Thermostatically operated valves close when the pressure is relieved or the temperature is reduced. Fusible plug valves require replacement of the plug. See also valve, safety relief and valve, regulating. Temperature.

plain first end style designator, "tee give "adql" and "adqm" only when flanged all ends" body style, threaded internal pipe first end connection type, right-hand first end thread direction, 0.750 inches first end nominal pipe size accommodated

Product Characteristics

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

Body Style: "tee give "adql" and "adqm" only when flanged all ends"
First End Connection Type: threaded internal pipe
First End Style Designator: plain
First End Nominal Pipe Size Accommodated: 0.750 inches
First End Thread Direction: right-hand
Second End Relationship With First End: identical
Third End Relationship With Preceding Ends: identical with first end
Flow Control Device: poppet
End Connection Quantity: 3
Opening Pressure Setting: 3000.0 pounds per square inch
Temp Adjustability: not adjustable
Temp Control Device Type: thermostatic
Material: steel body

Replaces National Stock Numbers

Below is a list of NSNs that have been officially superseded by this NSN:

NSN	Name	Date
4820-01-079-7143	No Name Available	11/01/1985

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
67A230B29	Pressure and Temper Relief Valve
8819-06 3-4	Pressure and Temper Relief Valve
8819-06 3-4 30	Pressure and Temper Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-139-3931?

The FSCG of the NSN 4820-00-139-3931 is 4820

Does the NSN 4820-00-139-3931 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-139-3931 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 4820-00-139-3931 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-139-3931 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 4820-00-139-3931 was assigned to the Federal Catalog?

It was assigned 54 years ago, on Wed, Aug 18, 1971