Pilot-operated relief valve
- Pilot-operated relief valve
A Pilot-Operated Relief Valve is used to relieve large flows with small pressure differential. [cite web|title=Pressure-control valves - part 1|url=http://www.hydraulicspneumatics.com/200/FPE/Valves/Article/True/6411/Valves 070111 hydraulicspneumatics.com no opening until 90% of full pressure] [cite web|title=PORV - What does PORV stand for? Acronyms and abbreviations by the Free Online Dictionary.|url=http://acronyms.thefreedictionary.com/PORV 070111 acronyms.thefreedictionary.com] [cite web|title=NMAH | Three Mile Island: The Inside Story |url=http://americanhistory.si.edu/tmi/tmi03.htm 070111 americanhistory.si.edu]
The main manufacturers of pilot operated safety relief valves are:
* [http://www.weirpowerindustrial.com/weirweb/powerindustrial/home.nsf/luBrands/Sarasin-RSBD Sarasin-RSBD] (France)
* Consolidated (USA)
* Anderson-Greenwood (USA)
* Farris (Canada)
* [http://www.astspa.it/ast AST] (Italy)
See also
* Three Mile Island nuclear accident
* Relief valve
* Safety valve
References
External links
* Sample PORV: http://www.taylorvalve.com/products/safety-relief-valves/pilot-valve/9300-series/
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