Definition(s)
Pressure-Relief Valve
A flow-control device installed as part of the circulating system able to open and shut in response to operating conditions in order to maintain preset limits for pressure applied to parts of the circulating system to prevent over pressurization.
Source: ABS Guide for Classification and Certification of Managed Pressure Drilling Systems, September 2017. Global Standards
Pressure-Relief Valve
Valve designed to open and relieve excess pressure and to reclose and prevent the further flow of fluid after normal conditions have been restored.
- NOTE: Other terms used for pressure-relief valve (PRV) include pressure safety valve (PSV), relief valve, safety valve, and safety relief valve.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Sixth Edition, January 2014. Global Standards
Pressure Relief Valve (PRV)
A valve that opens automatically to relieve the line pressure that is above the safe operating limit.
Source: IADC UBO / MPD Glossary, December 2011. Global Standards
Pressure-Relief Valve
Valve designed to open and relieve excess pressure and to reclose and prevent the further flow of fluid after normal conditions have been restored.
- NOTE: In ISO 4126-1, this is termed a safety valve.
Source: API STD 521, Pressure-relieving and Depressuring Systems, Fifth Edition, January 2007 (Addendum May 2008). Global Standards