Model: A51H209-3

Restrictor Check Valve

Special Features:

The end connection identified above as the second end is the valve inlet

Properties:

Thread Class

3a 2nd end

Thread Class

3b 1st end

Thread Direction

Right-hand 2nd end

Thread Direction

Right-hand 1st end

Flow Control Device

Poppet

Disk Loading Method

Spring

Maximum Operating Temp

275.0 degrees fahrenheit single response

Connection Style

External seat for gasket seal (boss) 2nd end

Connection Style

Gasket seal (boss) 1st end

Valve Operation Method

Automatic

Connection Type

Threaded external boss 2nd end

Connection Type

Threaded internal boss 1st end

Mounting Position

Horizontal or vertical

Thready Qty Per Inch (tpi)

20 1st end

Maximum Operating Pressure

3000.0 pounds per square inch single response

Thread Size

0.437 inches 1st end

Thread Size

0.437 inches 2nd end

Outside Diameter Tube Accommodated

0.250 inches 1st end

Outside Diameter Tube Accommodated

0.250 inches 2nd end

Material

Aluminum alloy 518.0 seat

Material

Aluminum alloy 518.0 body

Surface Treatment

Anodize

Style Designator

Straight thru

Thread Series Designator

Unf 2nd end

Thread Series Designator

Unjf 1st end

NSN

4820-00-485-7841

Part Number

A51H209-3

Description

Valve,restrictor Check

CAGE

61174

A valve having an orifice in the poppet, disk, or the like, to permit restricted fluid flow when the valve is seated. It does not have a stem or provisions for pressure adjustments, and is similar to a valve, check with the exception of the orifice which permits fluid flow in more than one direction.

Part A51H209-3 NSN 4820-00-485-7841

INC

FIIG

Concept No.

App. Key

Cond. Code

Status

INC:

20520

FIIG:

A530B0

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:

051080

UFC:

29300

LTL:

RATING VARIABLE

LCL:

WCC:

736

TCC:

SHC:

ACC:

Construction Materials

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Schedule B and Export

Schedule B: 8481309000
SITC: 74730
End Use: Industrial machines, other
NAICS: 332911
USDA: 1

Freight Class: Check valves of materials other than copper, iron or steel