4820-01-256-8744

Find complete technical information, availability, and procurement data for: 4820-01-256-8744
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-256-8744

Item Name Code

05488

Assigment Date

06/09/1987 (39 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, 400.0 pounds per square inch single response maximum operating pressure, zzzy criticality code justification, spring disk loading method, 128.0 cubic feet per minute valve discharge flow rate

Product Characteristics

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

Flow Control Device: disk
Disk Loading Method: spring
Valve Discharge Flow Rate: 128.0 cubic feet per minute
Maximum Operating Pressure: 400.0 pounds per square inch single response
Criticality Code Justification: zzzy
Opening Pressure Setting: 80.0 pounds per square inch
Material: copper alloy 922 body
Material: nickel alloy 400 flow control device
Material: nickel alloy 400 seat
Material: nickel alloy 400 stem
Material Document And Classification: astm b61 assn std single material response body
Material Document And Classification: qq-n-281 fed spec single material response flow control device
Material Document And Classification: qq-n-281 fed spec single material response seat
Material Document And Classification: qq-n-281 fed spec single material response stem
Media For Which Designed: oxygen, liquid single response
Style Designator: angle
Reference Number Differentiating Characteristics: cleaning, packaging, and marking iaw the latest revision of mil-std-1330

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
9955.K 5IM,TYPE	Safety Relief Valve
D841-4050	Safety Relief Valve
D841-4050CP	Safety Relief Valve
UU-1551-T	Safety Relief Valve
UU-1551-TCP	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-256-8744?

The FSCG of the NSN 4820-01-256-8744 is 4820

Does the NSN 4820-01-256-8744 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-256-8744 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 4820-01-256-8744 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-256-8744 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 4820-01-256-8744 was assigned to the Federal Catalog?

It was assigned 39 years ago, on Tue, Jun 9, 1987