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Part Numbers

Item Number Item Description
D559A3M2 Valve, Safety Relief

Master Requirement Codes

Code Translation
ADST The means by which the bonnet is attached to the item.
ADSR Indicates the type of housing on the item that accommodates the stem packing or spring.
AHNC The style designation indicating the configuration that most nearly corresponds to the appearance of the connection.
AWLS Indicates the type of connection/s/.
ADSU The means of closing the item when inlet pressure decreases.
ADQU The part that controls the flow through the item.
MATT The chemical compound or mechanical mixture properties of which the item is fabricated.
MATT The chemical compound or mechanical mixture properties of which the item is fabricated.
AEHZ The maximum temperature at which the item is rated to operate for an extended period of time.
CQGM The maximum pressure at which the item is rated for operation.
MEDA The type of media for which the item is designed.
MEDA The type of media for which the item is designed.
AAAR A measurement of the pipe size the item will accommodate.
CQJX A designation that is used for the purpose of general identification of the thread.
CSDC The predetermined pressure at which the item is calibrated to open.
MDCL The specification, standard, or manufacturers reference, and the classification designation, such as class, condition, temper, and the like, that identifies the material.
MDCL The specification, standard, or manufacturers reference, and the classification designation, such as class, condition, temper, and the like, that identifies the material.
STYL The style designation indicating the configuration that most nearly corresponds to the appearance of the item.
STDC The specification, standard, or manufacturers reference, and the classification designation, such as type, class, grade, and the like, that identifies the surface treatment material.
SFTT The metallic, nonmetallic, and/or chemical properties with which the item is plated, dipped, and/or coated.the treatment is designed to protect the surface(s) and cannot be wiped off.
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.
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.
AQLR The means used to control the operation of the valve.

D559A3M2 Safety Relief Valve

Cage 91816

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.

Technical Characteristics

Bonnet Attachment Method (ADST):
Threaded
Bonnet Type (ADSR):
Inside screw
Connection Style (AHNC):
Plain (pipe) 1st end
Connection Type (AWLS):
Threaded external pipe 1st end
Disk Loading Method (ADSU):
Spring
Flow Control Device (ADQU):
Poppet
Material (MATT):
Aluminum alloy 2024 body
Material (MATT):
Aluminum alloy 2024 seat
Maximum Operating Temp (AEHZ):
280.0 deg fahrenheit single response
Maximum Operating Pressure (CQGM):
200.0 pounds per square inch single response
Media For Which Designed (MEDA):
Air 1st response
Media For Which Designed (MEDA):
Hydrogen 4th response
Nominal Pipe Size Accommodated (AAAR):
0.375 inches 1st end
Nominal Thread Size (CQJX):
0.375 inches 1st end
Opening Pressure Setting (CSDC):
2.0 pounds per square inch
Material Document And Classification (MDCL):
Qq-a-225/6,alloy2024,t4 fed spec single material response body
Material Document And Classification (MDCL):
Qq-a-225/6,alloy2024,t4 fed spec single material response seat
Style Designator (STYL):
Straight thru w/baffle
Surface Treatment Document And Classification (STDC):
Mil-a-8625,ty 1 mil spec single treatment response
Surface Treatment (SFTT):
Anodize
Thread Direction (AAJF):
Right-hand 1st end
Thread Series Designator (THSD):
Npt 1st end
Valve Operation Method (AQLR):
Automatic

National Stock Number (NSN)

4820-00-001-0037