Model: 646B-3-3/8-2

Safety Relief Valve

Properties:

Thread Direction

Right-hand 2nd end

Thread Direction

Right-hand 1st end

Disk Loading Method

Spring

Maximum Operating Temp

250.0 degrees fahrenheit single response

Minimum Operating Temp

-40.0 degrees fahrenheit

Connection Style

G46b plain (pipe) 1st end

Connection Style

G9 plain, optional en (pipe) 2nd end

Valve Operation Method

Automatic

Connection Type

Threaded external pipe 1st end

Connection Type

Threaded internal pipe 2nd end

Adjustable Pressure Range

+40.0/+125.0 pounds per square inch

Thread Size

0.3750 inches 1st end

Thread Size

0.3750 inches 2nd end

Part Name Assigned By Controlling Agency

Differential area relief valve

Material

Steel comp 303 body

Thread Series Designator

Npt 2nd end

Thread Series Designator

Npt 1st end

NSN

4820-01-516-3833

Part Number

646B-3-3/8-2

Description

Valve,safety Relief

CAGE

72352

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 646B-3-3/8-2 NSN 4820-01-516-3833

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:

Packaging & Shipping

Est. Pack Size

Est. Pack Weight

Est. Item Weight

Est. Item Dim.

Pack Size:

Paclk Weight:

Item Weight:

Item Dim:

OPI

SPI No.

SPI Rev.

SPC Mkg.

LVL A

LVL B

OPI:

SPI No.:

SPI Rev.:

SPC Mkg:

LVL_A:

LVL_B:

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