Adjustable Relief Valve 6000 psi 1/4" MNPT Brass


The 504 is an economical, small, high pressure relief valve with excellent set pressure control over a large range. It stays bubble tight to within a few psi of set pressure and reseats bubble tight even after many vent cycles. Safety wire holes are provided for optional locking of set pressure adjustment. 0-6000 psi relief pressure. Maximum rated pressure: 6000 psi. Output pressure setting range: 900-6000 psi. Specify your desired output pressure setting at checkout.


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Type Relief Valve
Adjustment Range 900–6000 psi
Maximum Rated Pressure 6000 psi
Inlet Port Size 1/4" MNPT
Outlet Port Size Side vent; not captured
Flow Capacity 50 SCFM at 1500 psi
100 SCFM at 3000 psi
Outlet Pressure Rating Atmosphere
Leakage Bubble tight
Weight 3.3 oz (95 g)
Overall Length 2.5"
Hex Diameter 0.87"
Minimum Temperature -15ºF (-26ºC)
Body Material Nickel Plated Brass
Internal Materials Brass 
Seal Materials Viton
Flow Coefficient (Cv) 0.094" orifice diameter
Special Note Safety wire holes on device; no safety wire included. NOT SHIPPED OXYGEN CLEAN.

Typical Applications

  • Discharge and interstage reliefs on small high pressure compressors
  • Reliefs on charging lines, regulators, and manifolds
  • Hydraulic system and accumulator reliefs
  • Many other safety relief valve applications