Relief Valve 900-7500 psi: 1/4 in MNPT


The model 1607 is an economical, small, high pressure relief valve having excellent set pressure control over a large pressure range of 900 to 7500 psi. It opens smoothly without the load popping sound of some relief valves. 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.


A Pressure Relief Valve (also known as a Safety Valve, Overpressure Relief Valve, or simply a Relief Valve) limits the amount of pressure in a compressed gas system. Without such a valve in place, pressure could build up beyond what the system is designed for and cause equipment failure. The Pressure Relief Valve opens at a designed “set pressure” to protect the system against failure from being overpressurized.


Type Relief Valve
Special Features Safety wire holes on device, but no safety wire included
Adjustment Range 900-7500 psi
Maximum Rated Pressure 4500 psi
Inlet Port Size 1/4 in MNPT
Outlet Port Size Side vent; not captured
Flow Capacity 50 SCFM at 1500 psi
100 SCFM at 3000 psi
Fluids Gas or Liquid
Outlet Pressure Rating Atmosphere
Leakage Bubble tight
Weight 2.1 oz (60 g)
Overall Length 2.2 to 2.5 in depending on set pressure
Hex Diameter 7/8 in
Operating Temperature -40°F (-40°C) to +160F (71°C)
Body Material Anodized Aluminum
Internal Materials Brass 
Stainless Spring
Seal Materials Viton
Flow Coefficient (Cv) 0.11 in orifice diameter

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