Model: 638X2-6

Safety Relief Valve

Properties:

Pipe Size Accommodated

0.250 inches 2nd end

Thread Class

3a 1st end

Thread Direction

Right-hand 2nd end

Thread Direction

Right-hand 1st end

Flow Control Device

Poppet

Bonnet Type

Inside spring

Bonnet Attachment Method

Threaded

Disk Loading Method

Spring

Connection Style

G42 flared (tube) 1st end

Connection Style

G46b plain (pipe) 2nd end

Valve Operation Method

Automatic

Connection Type

Threaded external pipe 2nd end

Connection Type

Threaded external tube 1st end

Features Provided

Bonnet packing

Thready Qty Per Inch (tpi)

18 2nd end

Thready Qty Per Inch (tpi)

18 1st end

Adjustable Pressure Range

+10.0/+50.0 pounds per square inch

Thread Size

0.250 inches 2nd end

Thread Size

0.562 inches 1st end

Seat Angle

37.0 degrees 1st end

Outside Diameter Tube Accommodated

0.375 inches 1st end

Material

Copper alloy body

Material

Stainless steel flow control device

Thread Series Designator

Npt 2nd end

Thread Series Designator

Unf 1st end

NSN

4820-00-911-7166

Part Number

638X2-6

Description

Valve,safety Relief

CAGE

86768

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 638X2-6 NSN 4820-00-911-7166

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:

Freight Classification

NMFC

UFC

LTL

LCL

WCC

TCC

SHC

ACC

NMFC:

127220

UFC:

64490

LTL:

77.5

LCL:

77.5

WCC:

594

TCC:

SHC:

ACC:

Trailers/Vehicles

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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