Model: 3-749-79

Safety Relief Valve

Properties:

Thread Class

3a 1st end

Thread Direction

Right-hand 1st end

Disk Loading Method

Spring

Valve Discharge Flow Rate

900.0 cubic meters per minute

Maximum Operating Temp

160.0 degrees fahrenheit single response

Valve Operation Method

Manual

Connection Type

Threaded external tube 1st end

Thready Qty Per Inch (tpi)

20 1st end

Adjustable Pressure Range

+3300.0/+3500.0 pounds per square inch

Adjustable Pressure Range

+3300.0 to 3500.0 pounds per square inch

Maximum Operating Pressure

3000.0 pounds per square inch single response

Thread Size

0.437 inches 1st end

Seat Angle

12.0 degrees 1st end

Opening Pressure Setting

3700.0 pounds per square inch

Outside Diameter Tube Accommodated

0.250 inches 1st end

Material

Stainless steel flow control device

Media For Which Designed

Hydraulic fluid, phosphate-ester base single response

Surface Treatment

Anodize

Style Designator

Angle

Thread Series Designator

Unf 1st end

NSN

4820-00-142-2758

Part Number

3-749-79

Description

Valve,safety Relief

CAGE

45681

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 3-749-79 NSN 4820-00-142-2758

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:

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