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What (who) is safety valve - definition
![No. 46229, ''Duchess of Hamilton'']] lifts her boiler safety valve after hauling the ''Welsh Marches Pullman'' charter.](https://commons.wikimedia.org/wiki/Special:FilePath/46229 DUCHESS OF HAMILTON at Crewe Bank Shrewsbury.jpg?width=200 "No. 46229, ''Duchess of Hamilton'']] lifts her boiler safety valve after hauling the ''Welsh Marches Pullman'' charter.")
![''Tornado'']]](https://commons.wikimedia.org/wiki/Special:FilePath/Boiler safety valve of 60163 Tornado.jpg?width=200 "''Tornado'']]")
![Ramsbottom valves on a model [[traction engine]]](https://commons.wikimedia.org/wiki/Special:FilePath/Burrell single crank compound, valvechest side, Abergavenny steam rally 2012.jpg?width=200 "Ramsbottom valves on a model [[traction engine]]")
![Deadweight safety valve]] (1909)](https://commons.wikimedia.org/wiki/Special:FilePath/Deadweight safety valve section (Heat Engines, 1913).jpg?width=200 "Deadweight safety valve]] (1909)")
![Cover of ''The Pop Valve'', a self-published magazine by the American army [[Transportation Corps]] stationed in France in WWI](https://commons.wikimedia.org/wiki/Special:FilePath/FRB - The Pop Valve, item 1.jpg?width=200 "Cover of ''The Pop Valve'', a self-published magazine by the American army [[Transportation Corps]] stationed in France in WWI")
![lever arm safety valve]]](https://commons.wikimedia.org/wiki/Special:FilePath/Lever safety valve (Heat Engines, 1913).jpg?width=200 "lever arm safety valve]]")
![Salter spring balance valves]]](https://commons.wikimedia.org/wiki/Special:FilePath/Phoenix 1840 locomotive.jpg?width=200 "Salter spring balance valves]]")
![direct spring valve]]](https://commons.wikimedia.org/wiki/Special:FilePath/Planet replica.jpg?width=200 "direct spring valve]]")
![cross-section]] of a proportional-safety valve](https://commons.wikimedia.org/wiki/Special:FilePath/Proportional-Safety Valve.svg?width=200 "cross-section]] of a proportional-safety valve")
 (Heat Engines, 1913).jpg?width=200 "U-shaped Ramsbottom safety valve")
.jpg?width=200 "Salter spring balance")
![Lever arm safety valve in [[district heating substation]] before the renovation. [[Budapest]]](https://commons.wikimedia.org/wiki/Special:FilePath/Súlyterhelésű biztonsági szelep.jpg?width=200 "Lever arm safety valve in [[district heating substation]] before the renovation. [[Budapest]]")
![Midland Spinner]], showing paired spring-balance safety valves behind the dome](https://commons.wikimedia.org/wiki/Special:FilePath/076-SFEC-YORK-20070827.JPG?width=200 "Midland Spinner]], showing paired spring-balance safety valves behind the dome")
Wikipedia
A safety valve is a valve that acts as a fail-safe. An example of safety valve is a pressure relief valve (PRV), which automatically releases a substance from a boiler, pressure vessel, or other system, when the pressure or temperature exceeds preset limits. Pilot-operated relief valves are a specialized type of pressure safety valve. A leak tight, lower cost, single emergency use option would be a rupture disk.
Safety valves were first developed for use on steam boilers during the Industrial Revolution. Early boilers operating without them were prone to explosion unless carefully operated.
Vacuum safety valves (or combined pressure/vacuum safety valves) are used to prevent a tank from collapsing while it is being emptied, or when cold rinse water is used after hot CIP (clean-in-place) or SIP (sterilization-in-place) procedures. When sizing a vacuum safety valve, the calculation method is not defined in any norm, particularly in the hot CIP / cold water scenario, but some manufacturers have developed sizing simulations.
The term safety valve is also used metaphorically.
