Definition(s)
Relief Valve
A device that is built into a hydraulic or pneumatic system to relieve (dump) any excess pressure.
Source: API SPEC 16D, Specification for Control Systems for Drilling Well Control Equipment and Control Systems for Diverter Equipment, Upstream Segment, Second Edition, July 2004. Global Standards
Relief Valve
Spring-loaded pressure-relief valve actuated by the static pressure upstream of the valve, which normally opens in proportion to the pressure increase over the set pressure.
NOTE A relief valve is normally used with incompressible fluids.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Relief Valve
Spring-loaded pressure-relief valve actuated by the static pressure upstream of the valve, due to which the valve normally opens in proportion to the pressure increase over the opening pressure.
- NOTE: A relief valve is normally used with incompressible fluids.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards
Relief Valve
Valve specifically designed to protect a line or vessel from exceeding MAOP by relieving to atmosphere or a tank.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards