4820-01-183-2258

Find complete technical information, availability, and procurement data for: 4820-01-183-2258
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-183-2258

Item Name Code

05487

Assigment Date

07/04/1984 (42 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.

spring disk loading method, poppet flow control device, right-hand 2nd end thread direction, 3a 2nd end thread class, 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 2nd end
Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Flow Control Device: poppet
Disk Loading Method: spring
End Item Identification: advance attack helicopter ah-1w. mh-53e helicopter. s-3b viking aircraft. b-52 aircraft support equipment. c-2a (reprocured) aircraft. hh-60h search and rescue helicopter. hh-60j uscg search and rescue helicopter. f-14 tomcat aircraft.
Connection Style: external seat for gasket seal (boss) 2nd end
Valve Operation Method: automatic
Thread Quantity Per Inch: a16 2nd end
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.375 inches 1st end
Nominal Thread Size: 0.750 inches 2nd end
Seat Angle: 37.0 degrees 2nd end
Criticality Code Justification: feat
Special Features: weapon system essential
Material: rubber seat
Material: steel flow control device
Style Designator: straight thru
Thread Series Designator: npt 1st end
Thread Series Designator: unj 2nd 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
485-8-B28-2	Check Valve
485-8B28-2	Check Valve

FAQs

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

What is the FSCG of the NSN 4820-01-183-2258?

The FSCG of the NSN 4820-01-183-2258 is 4820

Does the NSN 4820-01-183-2258 have a Schedule B code assigned?

Yes, the Schedule B code is 8481301090

Does NSN 4820-01-183-2258 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 4820-01-183-2258 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-183-2258 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 4820-01-183-2258 was assigned to the Federal Catalog?

It was assigned 42 years ago, on Wed, Jul 4, 1984