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Safety Relief Valve

Model / MPN: 1521M6-200 | NSN: 4820-00-775-2401
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
Sold in multiples of
1 EA
Thread Class
3a all ends
Thread Direction
Right-hand all ends
Flow Control Device
Disk Loading Method
Connection Style
G4 gasket sea (boss) all ends
Connection Style
Gasket sea (boss) all ends
Valve Operation Method
Connection Type
Threaded internal boss all ends
Features Provided
Pressure tight outlet side
Adjustable Pressure Range
+50.0/+200.0 pounds per square inch
Thread Size
0.562 inches all ends
Aluminum alloy body
Aluminum alloy seat
Style Designator
Thread Series Designator
Unf all ends
1521M6 Series Parts

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1521M6-200 Cross Reference
  • Q4600-64
  • Q4600-64
  • 1521M6-200