Model: 668413-1

Safety Relief Valve

Properties:

Thread Class

3a 1st end

Thread Direction

Right-hand 1st end

Disk Loading Method

Spring

Valve Discharge Flow Rate

4.0 gallons per minute

Connection Style

G45 flareless (tube) 1st end

Connection Type

Threaded external tube 1st end

Features Provided

Valve stem lock shield and pressure tight outlet side

Thready Qty Per Inch (tpi)

18 1st end

Adjustable Pressure Range

+66.0/+70.0 pounds per square inch

Maximum Operating Pressure

75.0 pounds per square inch single response

Thread Size

0.562 inches 1st end

Seat Angle

12.0 degrees 1st end

Opening Pressure Setting

59.0 pounds per square inch

Outside Diameter Tube Accommodated

0.375 inches 1st end

Material

Aluminum alloy body

Material

Aluminum alloy seat

Media For Which Designed

Hydraulic fluid, phosphate-ester base single response

Surface Treatment

Anodize

Surface Treatment Specification

Mil-a-8625, type 1 military specification single treatment response

Test Data Document

36659-668413 drawing (this is the basic governing drawing, such as a contractor drawing, original equipment manufacturer drawing, etc.; excludes any specification, standard or other document that may be referenced in a basic governing drawing)

Thread Series Designator

Unf 1st end

NSN

4820-00-808-0526

Part Number

668413-1

Description

Valve,safety Relief

CAGE

98897

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 668413-1 NSN 4820-00-808-0526

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:

Equipment for Aircraft

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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