4820-00-684-4823

Find complete technical information, availability, and procurement data for: 4820-00-684-4823
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-684-4823

Item Name Code

20520

Assigment Date

01/01/1963 (63 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.

3a all ends thread class, spring disk loading method, 0.062 inches nominal aperture diameter, 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
Aperture Diameter: 0.062 inches nominal
Flow Control Device: disk
Disk Loading Method: spring
Maximum Operating Temp: 260.0 fahrenheit single response
Connection Style: flareless all ends
Valve Operation Method: automatic
Connection Type: threaded external tube all ends
Mounting Position: horizontal or vertical
Maximum Operating Pressure: 3000.0 pounds per square inch single response
Nominal Thread Size: 0.437 inches all ends
Seat Angle: 12.0 degrees all ends
Material: aluminum alloy body
Material: rubber synthetic packing
Media For Which Designed: hydraulic fluid, mineral base single response
Style Designator: straight thru
Thread Series Designator: unf 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
1R3441-4	Restrictor Check Valve

FAQs

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

What is the FSCG of the NSN 4820-00-684-4823?

The FSCG of the NSN 4820-00-684-4823 is 4820

Does the NSN 4820-00-684-4823 have a Schedule B code assigned?

Yes, the Schedule B code is 8481309000

Does NSN 4820-00-684-4823 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 4820-00-684-4823 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-684-4823 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 4820-00-684-4823 was assigned to the Federal Catalog?

It was assigned 63 years ago, on Tue, Jan 1, 1963