559B-8M-4

View detailed technical data, stock status, and sourcing information for: 559B-8M-4
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-315-6641

Item Name Code

05488

Assigment Date

02/22/1990 (36 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.

poppet flow control device, spring disk loading method, 250.0 fahrenheit single response maximum operating temp, plain (pipe) all ends 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: poppet
Disk Loading Method: spring
Maximum Operating Temp: 250.0 fahrenheit single response
Connection Style: plain (pipe) all ends
Valve Operation Method: automatic
Connection Type: threaded external pipe all ends
Adjustable Pressure Range: +2.5 to 5.9 pounds per square inch
Maximum Operating Pressure: 200.0 pounds per square inch single response
Nominal Thread Size: 1.000 inches all ends
Opening Pressure Setting: 4.0 pounds per square inch
Special Features: pop-off type
Material: copper alloy body
Media For Which Designed: air 1st response
Media For Which Designed: ammonia, gaseous 2nd response
Media For Which Designed: gas, inert 5th response
Media For Which Designed: hydrogen 4th response
Media For Which Designed: refrigerant 12 3rd response
Style Designator: straight thru note: to be used for valve bodies of one section only.
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
559B-8M-4	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-315-6641?

The FSCG of the NSN 4820-01-315-6641 is 4820

Does the NSN 4820-01-315-6641 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-315-6641 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 4820-01-315-6641 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-315-6641 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 4820-01-315-6641 was assigned to the Federal Catalog?

It was assigned 36 years ago, on Thu, Feb 22, 1990