646B1 1-2 2

View detailed technical data, stock status, and sourcing information for: 646B1 1-2 2
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Federal Supply Group

Valves

Federal Supply Classification

4820 Nonpowered Valves

National Stock Number

4820-00-490-6714

Item Name Code

05488

Assigment Date

10/01/1969 (56 years ago)

spring disk loading method, right-hand 2nd end thread direction, right-hand 1st end thread direction, 225.0 fahrenheit single response maximum operating temp, poppet flow control device

Product Characteristics

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

Thread Direction: right-hand 1st end
Thread Direction: right-hand 2nd end
Flow Control Device: poppet
Disk Loading Method: spring
Maximum Operating Temp: 225.0 fahrenheit single response
Connection Style: plain (pipe) 2nd end
Connection Style: plain,optional end(pipe) 1st end
Valve Operation Method: automatic
Connection Type: threaded external pipe 2nd end
Connection Type: threaded internal pipe 1st end
Adjustable Pressure Range: +4.0 to 15.0 pounds per square inch
Maximum Operating Pressure: 3600.0 pounds per square inch single response
Nominal Thread Size: 0.500 inches 1st end
Nominal Thread Size: 0.500 inches 2nd end
Material: rubber synthetic seat
Material: steel corrosion resisting body
Material: steel corrosion resisting flow control device
Media For Which Designed: air 1st response
Media For Which Designed: hydraulic fluid, petroleum base 2nd response
Style Designator: angle
Thread Series Designator: npt 2nd end
Thread Series Designator: npt 1st 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
646B-1-1/2-2	Safety Relief Valve
646B1 1-2 2	Safety Relief Valve

FAQs

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

What is the FSCG of the NSN 4820-00-490-6714?

The FSCG of the NSN 4820-00-490-6714 is 4820

Does the NSN 4820-00-490-6714 have a Schedule B code assigned?

Yes, the Schedule B code is 8481400000

Does NSN 4820-00-490-6714 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 4820-00-490-6714 contain precious materials?

Item does not contain precious metal.

Does NSN 4820-00-490-6714 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 4820-00-490-6714 was assigned to the Federal Catalog?

It was assigned 56 years ago, on Wed, Oct 1, 1969