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NSN: 4820-00-001-6553
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Cross Reference

These part numbers have the same form, fit, and function of a51k56028-1
Item Number Cage
A51K56028-1 61174

Characteristic Codes

A51K56028-1 spec. code meanings
Code Translation
AAJD A numeric-alpha designator indicating the pitch diameter tolerance and an external or internal thread.
AAJF The direction of the thread when viewed axially. a right-hand thread winds in a clockwise direction while a left-hand thread winds in a counterclockwise direction.
ADQU The part that controls the flow through the item.
ADSU The means of closing the item when inlet pressure decreases.
AHNC The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.
AHNC The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.
AQLR The means used to control the operation of the valve.
AWLS Indicates the type of connection/s/.
CBBL Those features, not otherwise specified, which may be required for proper functioning of the item.
CMLP The number of threads on the item per linear inch measured on a line parallel to the thread axis.
CQJX A designation that is used for the purpose of general identification of the thread.
CWFD The nominal length of a straight line which passes through the center of the accommodated tube, and terminates at the outside circumference.
MATT The chemical compound or mechanical mixture properties of which the item is fabricated.
STYL The style designation indicating the configuration that most nearly corresponds to the appearance of the item.
STYL The style designation indicating the configuration that most nearly corresponds to the appearance of the item.
THSD A designation distinguishing one group of thread diameter-pitch combinations from another by the number of threads per measurement scale for a specific diameter.

A51K56028-1

Description: Safety Relief Valve
Mfr. Cage 61174

Specification

Thread Size: 1-3/16", steel overall

AAJD Thread Class
3a 1st end
AAJF Thread Direction
Right-hand 1st end
ADQU Flow Control Device
Poppet
ADSU Disk Loading Method
Spring
AHNC Connection Style
G50 external seat for gasket seal (boss) 1st end
AHNC Connection Style
External seat for gasket seal (boss) 1st end
AQLR Valve Operation Method
Automatic
AWLS Connection Type
Threaded external boss 1st end
CBBL Features Provided
Pressure tight outlet side
CMLP Thready Qty Per Inch (tpi)
16 1st end
CQJX Nominal Thread Size
1.187 inches 1st end
CWFD Nominal Outside Diameter Tube Accommodated
0.875 inches 1st end
MATT Material
Steel
STYL Style Designator
Err-090
STYL Style Designator
Straight thru
THSD Thread Series Designator
Unj 1st end

Technical Definition

Valve, Safety Relief, also referenced with federal logistics item name code 05488 - 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.
National Stock Number (NSN) 4820-00-001-6553

Last Modified: 02/14/2017