Adjustable Relief Valve 6500 psi 1/4" MNPT Aluminum


The 504H is an economical, small, high pressure relief valve with excellent extended set pressure control over a large ranch. 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. Maximum rated pressure: 6500 psi. Output pressure setting range: 900-6500 psi. Specify your desired output pressure setting at checkout.


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Type Relief Valve
Special Features Extended Set Pressure
Adjustment Range 900-6500 psi
Maximum Rated Pressure 6500 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 2.1 oz (60 g)
Overall Length 2.5"
Hex Diameter 0.87"
Minimum Temperature -15ºF (-26ºC)
Body Material Anodized Aluminum
Internal Materials Brass 
Seal Materials Viton
Flow Coefficient (Cv) 0.094 in orifice diameter
Special Note Safety wire holes on device; no safety wire included.

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