644XB3-12-11

View detailed technical data, stock status, and sourcing information for: 644XB3-12-11
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-820-6782

Item Name Code

05488

Assigment Date

01/01/1962 (64 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.

inside spring bonnet type, poppet flow control device, 3a all ends thread class, integral bonnet attachment method, 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: poppet
Bonnet Type: inside spring
Bonnet Attachment Method: integral
Disk Loading Method: spring
Connection Style: flared (tube) all ends
Valve Operation Method: automatic
Connection Type: threaded external tube all ends
Thread Quantity Per Inch: 12 all ends
Adjustable Pressure Range: +40.0 to 125.0 pounds per square inch
Nominal Thread Size: 1.062 inches all ends
Seat Angle: 37.0 degrees all ends
Nominal Outside Diameter Tube Accommodated: 0.750 inches all ends
Material: steel corrosion resisting overall
Style Designator: angle
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
644XB3-12-11	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-820-6782?

The FSCG of the NSN 4820-00-820-6782 is 4820

Does the NSN 4820-00-820-6782 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-820-6782 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 4820-00-820-6782 contain precious materials?

Precious metal content is unknown

Does NSN 4820-00-820-6782 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 4820-00-820-6782 was assigned to the Federal Catalog?

It was assigned 64 years ago, on Mon, Jan 1, 1962