644XB-3-12-27

View detailed technical data, stock status, and sourcing information for: 644XB-3-12-27
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-01-449-8134

Item Name Code

05488

Assigment Date

10/16/1997 (28 years ago)

A valve with one inlet and one outlet connection with outlet flow parallel to inlet flow. The flow is controlled by the action of a stem which lifts the disk perpendicularly off the center axis of its seat. The stem is at a 90 degree (1.5708 radians) angle to axis of flow. Excludes:valve, stop-check; cock, shutoff, screw stem; and valve, solenoid.

poppet flow control device, right-hand all ends thread direction, 3a all ends thread class, spring disk loading method, aircraft, awacs, e-3a end item identification

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
Disk Loading Method: spring
End Item Identification: aircraft, awacs, e-3a
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 50.0 pounds per square inch
Maximum Operating Pressure: 3600.0 pounds per square inch single response
Nominal Thread Size: 1.062 inches all ends
Seat Angle: 37.0 degrees all ends
Special Features: 15 gpm flow rate
Material: steel corrosion resisting body
Style Designator: angle
Thread Series Designator: unj 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
644XB-3-12-27	Safety Relief Valve
644XB-3-12-3	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-01-449-8134?

The FSCG of the NSN 4820-01-449-8134 is 4820

Does the NSN 4820-01-449-8134 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-01-449-8134 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 4820-01-449-8134 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-01-449-8134 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 4820-01-449-8134 was assigned to the Federal Catalog?

It was assigned 28 years ago, on Thu, Oct 16, 1997