Relief Valve

Relief valves are precision pressure-control valves used for system over pressure protection and pressure stabilization. They are available in soft-seat (FRV10/20) and metal-seat (FRV30/45) versions, with body material 316 stainless steel. Working pressure ranges from 50 psi up to 45,000 psi, suitable for gas, liquid, high-pressure gas systems, cryogenic systems and petrochemical applications. Easy field adjustment and reliable relief performance.

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Core Advantage

  • Working pressure: 50–10,000 psi (RV series); 3,000–45,000 psi (FRV series)
  • Body: 316 stainless steel; seals: NBR, PTFE packing, nylon or metal seat
  • FRV10/FRV20: soft seat design, good sealing, repeatable pop & reset, long cycle life
  • FRV30/FRV45: metal seat design, ultra-low temp resistance to -252°C (-421°F)
  • Orifice size: 2.7 mm – 6.35 mm
  • Inlet & Outlet: 1/4” NPT standard; easy on-site adjustment
  • Proportional opening with pressure rise; full flow at 10% above set pressure
  • All pressure-containing parts traceable to raw material

Application

  • High-pressure gas systems & pressure test systems
  • Cryogenic systems (excluding LN₂ & L-CO₂ for soft-seat types)
  • Petroleum, petrochemical & chemical processing
  • Industrial hydraulic systems & overpressure protection
  • Special fluid systems requiring precise pressure relief.

Technical Specifications

RV Series Relief Valves

ModelPressure Rating (psi)Orifice (mm)Cv RatingMedia
RV-0650 – 60003.60.27Gas / Liquid
RV-101000 – 100001.60.12Gas / Liquid
RV-2010000 – 200001.60.12Gas / Liquid

FRV Series Relief Valves

ModelInletOutlet (NPT)OrificeMin Setting (psi)Max Setting (psi)Max Back Pressure (psi)Length (mm)
FRV-10LF93/4”6.35 mm300011000500239
FRV-20LF93/4”3.96 mm1100021000500239
FRV-30HF93/4”3.18 mm2100030000500251.5
FRV-45HF91/2”2.7 mm3000045000500360