3978-5

View detailed technical data, stock status, and sourcing information for: 3978-5
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-005-4964

Item Name Code

05488

Assigment Date

06/09/1972 (54 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, external seat for gasket seal (boss) 1st end connection style, 3a 1st end thread class, automatic valve operation method, right-hand 1st end 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 Class: 3a 1st end
Thread Direction: right-hand 1st end
Flow Control Device: disk
Connection Style: external seat for gasket seal (boss) 1st end
Valve Operation Method: automatic
Connection Type: threaded external boss 1st end
Adjustable Pressure Range: +25.0 to 75.0 pounds per square inch
Nominal Thread Size: 0.562 inches 1st end
Opening Pressure Setting: 33.0 pounds per square inch
Material: aluminum alloy overall
Style Designator: straight thru
Thread Series Designator: unf 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
3978-5	Safety Relief Valve
3978-5-33-0	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-005-4964?

The FSCG of the NSN 4820-00-005-4964 is 4820

Does the NSN 4820-00-005-4964 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-005-4964 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 4820-00-005-4964 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-005-4964 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 4820-00-005-4964 was assigned to the Federal Catalog?

It was assigned 54 years ago, on Fri, Jun 9, 1972