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Safety Relief Valve

Model / MPN: 520A-8D-148 | NSN: 4820-00-139-4118
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
4820-00-139-4118
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
-100.0 degrees fahrenheit 1st response500.0 degrees fahrenheit 2nd response
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
0.750 inches 1st end
Opening Pressure Setting
148.0 pounds per square inch
Outside Diameter Tube Accommodated
0.500 inches 1st end
Material
Aluminum alloy 2024 seat
Material
Aluminum alloy 2024 stem and plastic polytetrafluoroethylene stem
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 seat
Material Specification
Qq-a-225/6, alloy2024, t4 federal specification 1st material response flow control device
Media For Which Designed
Fuel/oil, hydrocarbon single response
Surface Treatment
Anodize
Surface Treatment Specification
Mil-a-8625, type 1 military specification single treatment response
Style Designator
Straight thru
Thread Series Designator
Unjf 1st end
520A Series Parts
Solicitations
Solicitation Description Qty UOM Close Date
SPE7MC18T4978 Valve, Safety Relief 40 EA 01/29/2018

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520A-8D-148 Cross Reference
  • 10233963