Knowledge

/Home

Pressure Relief Valve Terminologies and Applications

  • PRV is a generic term that describes an automatic pressure relieving device, actuated by static pressure upstream of the valve
  • Set to open at a predetermined pressure to avoid over pressure in a vessel
  • As pressure in the vessel reduces the valve will close at a pressure below the predetermined set pressure
  • Safety Valve (SV) (ASME Section I)

  • an automatic pressure-relieving device actuated by the static pressure upstream of the valve, and characterized by a rapid opening or “pop” action. It is used for steam, gas, or vapor service.
  • “Open Spring” design
  • Relief Valve (RV)(Non-Coded)

  • an automatic pressure-relieving device, actuated by static pressure upstream from the valve. A relief valve is used primarily for liquid service.
  • Safety Relief Valve (SRV)

  • an automatic pressure relieving device used as either a safety or relief valve, depending upon application. The SRV is used
  • Designed to be used on steam, gas, vapor, or liquids
  • Can meet a wide variety of applications due to the versatile design
  • Most common type pressure relief valve in the industry