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Safety Relief Valve

Model / MPN: 638XB3-8-11 | NSN: 4820-00-948-5784
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
4820-00-948-5784
Sold in multiples of
1 EA
DEMIL
NO
Thread Class
3a 1st end
Thread Direction
Right-hand 2nd end
Thread Direction
Right-hand 1st end
Flow Control Device
Poppet
Bonnet Type
Inside spring
Bonnet Attachment Method
Integral
Disk Loading Method
Spring
Maximum Operating Temp
250.0 degrees fahrenheit single response
Connection Style
G42 flared (tube) 1st end
Connection Style
G46b plain (pipe) 2nd end
Valve Operation Method
Automatic
Connection Type
Threaded external pipe 2nd end
Connection Type
Threaded external tube 1st end
Features Provided
Bonnet packing and valve stem lock shield
Adjustable Pressure Range
+40.0/+125.0 pounds per square inch
Maximum Operating Pressure
125.0 pounds per square inch single response
Thread Size
0.375 inches 2nd end
Thread Size
0.750 inches 1st end
Seat Angle
37.0 degrees 1st end
Opening Pressure Setting
90.0 pounds per square inch
Outside Diameter Tube Accommodated
0.500 inches 1st end
Material
Aluminum alloy body
Material
Aluminum alloy seat
Material
Stainless steel flow control device and rubber butadiene-acrylonitrile class nbr flow control device
Media For Which Designed
Oil, lubricating, diester base single response
Surface Treatment
Anodize
Surface Treatment Specification
Mil-a-8625, type 2 military specification single treatment response
Thread Series Designator
Npt 2nd end
Thread Series Designator
Unf 1st end
638XB3 Series Parts

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638XB3-8-11 Cross Reference
  • 1C3576P10
  • 628XB3-8-11