Model: 1856M-OL-1/2X3/4-20PSI

Safety Relief Valve

Special Features:

Clean per mil-std-767 and aor-767-1; inspect per mil-i-45208; ship per mil-std-129

Properties:

Thread Direction

Right-hand 2nd end

Thread Direction

Right-hand 1st end

Flow Control Device

Disk

Bonnet Type

Inside screw

Bonnet Attachment Method

Threaded

Disk Loading Method

Spring

Maximum Operating Temp

450.0 degrees fahrenheit single response

Connection Style

G46b plain (pipe) 1st end

Connection Style

G9 plain, optional en (pipe) 2nd end

Connection Type

Threaded external pipe 1st end

Connection Type

Threaded internal pipe 2nd end

Maximum Operating Pressure

300.0 pounds per square inch single response

Thread Size

0.500 inches 1st end

Thread Size

0.750 inches 2nd end

Criticality Code Justification

Zzzy

Opening Pressure Setting

20.0 pounds per square inch

Material

Copper alloy

Media For Which Designed

Steam 1st response

Media For Which Designed

Air 2nd response

Thread Series Designator

Npt 2nd end

Thread Series Designator

Npt 1st end

Reference Number Differentiating Characteristics

Material will be in accordance with ships parts control center activity hx quality control, manufacturing and testing specifications

NSN

4820-01-268-0594

Part Number

1856M-OL-1/2X3/4-20PSI

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 1856M-OL-1/2X3/4-20PSI NSN 4820-01-268-0594

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:

7.0 X 3.0 X 3.0

Paclk Weight:

5.0000lbs

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:

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