Model: 257AH

Fluid Pressure Regulating Valve

Properties:

Body Material

Brass

Body Style

Straight thru

Furnished Items

Cylinder gage and delivery gage

Media For Which Designed

Oxygen, gaseous

First End Connection Type

Threaded external tube

First End Style Designator

Inverted flare

First End Outside Diameter Tube Accommodated

0.375 inches

First End Thread Size And Series/type Designator

9/16-18 unf

First End Thread Class

First End Thread Direction

Right-hand

Second End Relationship With First End

Not identical

Second End Connection Type

Threaded internal gas cylinder

Second End Style Designator

Swivel nut, gas

Second End Thread Size And Series/type Designator

0.908-14 ngo

Second End Thread Direction

Right-hand

First End Seat Angle In Deg

30.0

Second End Seat Radius

0.281 inches

Flow Control Device

Disk, bottom guided

End Connection Quantity

Second End Thread Pitch Diameters

+0.8616 to 0.8652 inches

Outlet Pressure Range

+0.0 to 100.0 pounds per square inch

Regulation Type

1st stage manual, 2nd stage automatic

Manual Control Method

Tee handle

Valve Loading Method

Spring

Maximum Inlet Pressure Rating

3000.0 pounds per square inch

Filter

Included

Nondefinitive Specification/std Data

2 type and ow2 class

Departure From Cited Designator

As modified by the dial range

NSN

4820-00-171-9817

Part Number

257AH

Description

Valve,regulating,fluid Pressure

CAGE

14011

A valve designed to automatically maintain within close limits a predetermined outlet pressure which may be adjustable within a specified range regardless of the higher fluctuating or constant inlet pressure. It is designed for use with compressed gas(es) and various liquids and may include gauges. It may be inline or cartridge (manifold) design. Excludes regulator, pressure, medical gas administration apparatus; regulator, oxygen, barometric continuous flow; regulator, oxygen demand; regulator, oxygen diluter demand; and valve(1), fluid pressure regulating, aircraft.

Part 257AH NSN 4820-00-171-9817

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

27565

FIIG:

A21100

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:

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:

WCC:

594

TCC:

SHC:

ACC:

Trailers/Vehicles

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Schedule B and Export

Schedule B: 8481809015
SITC: 74780
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Regulator valves, self-operating, for controlling variables such as temperature, pressure, flow and liquid level