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

Safety Relief Valve

Model / MPN: 20138 ASSY 20138J51SS | NSN: 4820-01-407-0942
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
4820-01-407-0942
Sold in multiples of
1 EA
DEMIL
NO
Flow Control Device
Disk
Bonnet Type
Inside spring
Bonnet Attachment Method
Integral
Disk Loading Method
Spring
Bolt Hole Quantity
4 all ends
Maximum Operating Temp
275.0 degrees fahrenheit single response
End Application
Wasp class lhd
Valve Operation Method
Automatic
Flange Shape
Round with holes all ends
Connection Type
Flange all ends
Valve Size
0.500 inches
Adjustable Pressure Range
+56.0/+65.0 pounds per square inch
Maximum Operating Pressure
500.0 pounds per square inch single response
Outside Diameter
3.500 inches all ends
Thickness
0.438 inches all ends
First Connection Face To Centerline Distance
3.250 inches
Bolt Hole Diameter
0.625 inches all ends
Second Connection Face To Centerline Distance
3.250 inches
Bolt Circle Diameter
2.375 inches all ends
Flange Face Design
Raised straight all ends
Raised Face Height
0.062 inches all ends
Raised Face Diameter
1.375 inches all ends
Material
Steel body
Material
Stainless steel stem
20138J Series Parts
Solicitations
Solicitation Description Qty UOM Close Date
SPE7MC19T141E Valve, Safety Relief 1 EA 08/19/2019
SPE7MC20T7352 Valve, Safety Relief 1 EA 04/06/2020

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20138 ASSY 20138J51SS Cross Reference
  • 20138H01S0056
  • 20138
  • 20138H01S0056
  • 20138 ASSY 20138J51SS
  • 20138J51SS