HP500 Series Relief Valves

HP500 Series Relief Valve


  • Very accurate cracking pressure
  • Zero leakage up to 95% of cracking pressure
  • 100% seat leakage tested
  • Tamper-proof adjustment
  • PED certifications and CE marking available for most models

Technical Data

Please consult your Circle Seal Controls Distributor or our factory for information on special connections, materials, sizes, o-rings, operating pressures and temperature ranges.

  • Body Materials

    • Brass
    • 316 stainless steel
  • Connection Sizes

    1/4″ to 1/2″

  • Cracking Pressure

    150 to 575 PSI

  • Configuration

    Popoff & Inline

  • Connections

    • Male Pipe
    • Female Pipe
  • Seat Materials

    • Buna N
    • Ethylene Propylene
    • Neoprene
    • Silicone
    • Viton®

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