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Worldwide distributor of NSN parts and consumables located in the USA.

Safety Relief Valve

Model / MPN: D559A4D42PS1 | NSN: 4820-00-009-5209
ITAR Registered seal

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.

Product Details
NATO Stock Number
4820-00-009-5209
Sold in multiples of
1 EA
DEMIL
NO
Thread Class
3a 1st end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Disk Loading Method
Spring
Maximum Operating Temp
280.0 degrees fahrenheit single response
Minimum Operating Temp
-40.0 degrees fahrenheit
Connection Style
G46a plain (tube) 1st end
Connection Style
Plain (tube) 1st end
Valve Operation Method
Automatic
Connection Type
Threaded external tube 1st end
Maximum Operating Pressure
200.0 pounds per square inch single response
Thread Size
0.437 inches 1st end
Opening Pressure Setting
42.0 pounds per square inch
Material
Aluminum alloy 2024 flow control device and rubber butadiene-acrylonitrile class nbr flow control device
Material
Aluminum alloy 2024 seat
Material
Aluminum alloy 2024 body
Material Specification
Qq-a-225/6, alloy2024, t4 federal specification single material response body
Material Specification
Qq-a-225/6, alloy2024, t4 federal specification single material response flow control device
Material Specification
Qq-a-225/6, alloy2024, t4 federal specification single material response seat
Media For Which Designed
Refrigerant 12 4th response
Media For Which Designed
Acetylene 2nd response
Media For Which Designed
Air 1st response
Media For Which Designed
Ammonia, gaseous 3rd response
Media For Which Designed
Hydrogen 5th response
Style Designator
C5 straight through w/baffle
Style Designator
Straight through w/baffle
Thread Series Designator
Unjf 1st end
Furnished Items And Quantity
1 deflector cap

Pricing and Availability

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D559A4D42PS1 Cross Reference
  • 247ASC1527-002
  • D559A-4D-42
  • D559A4D42PSI