Model: P891-2

Safety Relief Valve

Special Features:

Clean for oxygen

Properties:

Pipe Size Accommodated

0.250 inches 2nd end

Pipe Size Accommodated

0.250 inches 1st end

Thread Direction

Right-hand 2nd end

Thread Direction

Right-hand 1st end

Flow Control Device

Poppet

Bonnet Type

Inside spring

Bonnet Attachment Method

Threaded

Disk Loading Method

Spring

Connection Style

G46b plain (pipe) 2nd end

Connection Style

G9 plain, optional en (pipe) 1st end

Valve Operation Method

Automatic

Connection Type

Threaded external pipe 2nd end

Connection Type

Threaded internal pipe 1st end

Features Provided

Valve stem lock shield and bonnet packing and pressure tight outlet side

Thready Qty Per Inch (tpi)

18 2nd end

Thready Qty Per Inch (tpi)

18 1st end

Maximum Operating Pressure

200.0 pounds per square inch single response

Thread Size

0.250 inches 1st end

Thread Size

0.250 inches 2nd end

Criticality Code Justification

Feat

Opening Pressure Setting

1.0 pounds per square inch

Material

Aluminum alloy body

Material

Aluminum alloy seat

Media For Which Designed

Water-oil-gas single response

Thread Series Designator

Npt 2nd end

Thread Series Designator

Npt 1st end

NSN

4820-00-998-1739

Part Number

P891-2

Description

Valve,safety Relief

CAGE

99251

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 P891-2 NSN 4820-00-998-1739

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:

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