3978-4SET20

View detailed technical data, stock status, and sourcing information for: 3978-4SET20
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-025-6844

Item Name Code

05488

Assigment Date

08/08/1976 (50 years ago)

plain (tube) all ends connection style, 3a all ends thread class, 280.0 fahrenheit single response maximum operating temp, disk flow control device, 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 Class: 3a all ends
Thread Direction: right-hand all ends
Flow Control Device: disk
Maximum Operating Temp: 280.0 fahrenheit single response
Connection Style: plain (tube) all ends
Valve Operation Method: automatic
Connection Type: threaded external tube all ends
Thread Quantity Per Inch: 18 all ends
Adjustable Pressure Range: +0.5 to 2.4 pounds per square inch
Maximum Operating Pressure: 150.0 pounds per square inch single response
Nominal Thread Size: 0.562 inches all ends
Material: aluminum body
Material: rubber butadiene-acrylonitrile class nbr packing
Media For Which Designed: air 1st response
Media For Which Designed: refrigerant 12 2nd response
Surface Treatment: anodize
Style Designator: straight thru
Thread Series Designator: unj 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
3978-4	Safety Relief Valve
3978-4SET20	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-025-6844?

The FSCG of the NSN 4820-01-025-6844 is 4820

Does the NSN 4820-01-025-6844 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-025-6844 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 4820-01-025-6844 contain precious materials?

Precious metal content is unknown

Does NSN 4820-01-025-6844 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 4820-01-025-6844 was assigned to the Federal Catalog?

It was assigned 50 years ago, on Sun, Aug 8, 1976