Model: 645B-4-12-2

Safety Relief Valve

Properties:

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

NSN

4820-00-942-9134

Part Number

645B-4-12-2

Description

Valve,safety Relief

CAGE

09990

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.

Part 645B-4-12-2 NSN 4820-00-942-9134

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

05488

FIIG:

A046B0

Concept No.:

App. Key:

Cond. Code:

Status:

Material Classification

Hazardous material, precious metals, criticality, enviroment, and electrostatic discharge indicators

HMIC

PMIC

ESD/EMI

ENAC

MMAC

CRITL

HMIC:

PMIC:

ESD:

MMAC:

CRITL:

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Schedule B and Export

Schedule B: 8481400000
SITC: 74740
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Safety or relief valves