Model: 621B-6-3/4-2

Safety Relief Valve

Properties:

Thread Direction

Right-hand all ends

Flow Control Device

Poppet

Maximum Operating Temp

225.0 degrees fahrenheit single response

Connection Style

G46b plain (pipe) 1st endg9 plain, optional en (pipe) 2nd end

Valve Operation Method

Automatic

Connection Type

Threaded external pipe 1st endthreaded internal pipe 2nd end

Maximum Operating Pressure

3600.0 pounds per square inch single response

Thread Size

0.750 inches all ends

Opening Pressure Setting

550.0 pounds per square inch

Material

Aluminum alloy bodysteel comp 416 flow control device

Media For Which Designed

Air 1st responsehydraulic fluid, mineral base 2nd response

Thread Series Designator

Npt all ends

NSN

4820-01-360-6156

Part Number

621B-6-3/4-2

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 621B-6-3/4-2 NSN 4820-01-360-6156

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:

5.0 X 5.0 X 4.0

Paclk Weight:

1.0000lbs

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