Safety Relief Valve

Model / MPN: 645B-4-12-2 | NSN: 4820-00-942-9134

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.

Product Details

NATO Stock Number

4820-00-942-9134

Sold in multiples of

DEMIL

Thread Direction

Right-hand 1st end

Disk Loading Method

Spring

Maximum Operating Temp

-65.0 degrees fahrenheit 1st response

Maximum Operating Temp

225.0 degrees fahrenheit 2nd response

Connection Type

Threaded internal tube 1st end

Features Provided

Pressure tight outlet side

Thready Qty Per Inch (tpi)

12 1st end

Maximum Operating Pressure

200.0 pounds per square inch single response

Thread Size

1.500 inches 1st end

Opening Pressure Setting

200.0 pounds per square inch

Outside Diameter Tube Accommodated

0.750 inches 1st end

Material

Stainless steel body

Material

Stainless steel seat

Media For Which Designed

Fuel/oil, hydrocarbon single response

Style Designator

Angle

Thread Series Designator

Un 1st end

645B4 Series Parts

645B4-12-2

Pricing and Availability

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645B-4-12-2 Cross Reference

645B4-12-2