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Safety Relief Valve

Model / MPN: 5139B3MP300 | NSN: 4820-00-437-0114
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
4820-00-437-0114
Sold in multiples of
DEMIL
NO
Pipe Size Accommodated
0.375 inches 1st end
Pipe Size Accommodated
0.375 inches 2nd end
Thread Direction
Right-hand 2nd end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Disk Loading Method
Spring
Maximum Operating Temp
250.0 degrees fahrenheit single response
Connection Style
G46b plain (pipe) 1st endg9 plain, optional en (pipe) 2nd end
Connection Style
Plain (pipe) 1st endplain, optional en (pipe) 2nd end
Valve Operation Method
Automatic
Connection Type
Threaded external pipe 1st endthreaded internal pipe 2nd end
Thready Qty Per Inch (tpi)
18 2nd end
Thready Qty Per Inch (tpi)
18 1st end
Adjustable Pressure Range
+286.0/+345.0 pounds per square inch
Maximum Operating Pressure
2500.0 pounds per square inch single response
Thread Size
0.375 inches 2nd end
Thread Size
0.375 inches 1st end
Opening Pressure Setting
300.0 pounds per square inch
Material
Copper alloy
Media For Which Designed
Ammonia, gaseous 1st response
Media For Which Designed
Fuel/oil, hydrocarbon 2nd response
Media For Which Designed
Hydrogen 3rd response
Style Designator
Straight through note: to be used for valve bodies of separable sections.
Thread Series Designator
Npt 2nd end
Thread Series Designator
Npt 1st end
5139B Series Parts

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5139B3MP300 Cross Reference
  • 5159B-3MP-300