Model: C491-2

Safety Relief Valve

Properties:

Thread Class

3a 1st end

Thread Direction

Right-hand 1st end

Flow Control Device

Disk

Valve Discharge Flow Rate

200.0 cubic feet per minute

Maximum Operating Temp

450.0 degrees fahrenheit single response

Connection Style

G50 external seat for gasket seal (boss) 1st end

Connection Style

External seat for gasket seal (boss) 1st end

Valve Operation Method

Automatic

Connection Type

Threaded external boss 1st end

Features Provided

Valve stem lock shield and pressure tight outlet side

Thready Qty Per Inch (tpi)

12 1st end

Adjustable Pressure Range

+47.0/+53.0 pounds per square inch

Maximum Operating Pressure

60.0 pounds per square inch single response

Thread Size

1.312 inches 1st end

Opening Pressure Setting

50.0 pounds per square inch

Outside Diameter Tube Accommodated

1.000 inches 1st end

Material

Aluminum alloy 2024

Material Specification

Qq-a-225/6, alloy2024 federal specification all material responses

Media For Which Designed

Air single response

Surface Treatment

Anodize

Surface Treatment Specification

Mil-a-8625 military specification single treatment response

Style Designator

Straight thru

Thread Series Designator

Un 1st end

NSN

4820-00-191-6881

Part Number

C491-2

Description

Valve,safety Relief

CAGE

81755

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 C491-2 NSN 4820-00-191-6881

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:

576

TCC:

SHC:

ACC:

Construction Materials

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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