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