A safety valve is valve mechanism for automatic release of the substance from a pressure vessel, boiler, or any system when a temperature or pressure exceeds the preset limits. It is the part of a larger set named as pressure safety valves or pressure relief valves. The additional parts of set are named as relief valves, pilot-functioned safety release valves, safety relief valves, low-pressure valves and vacuum pressure safety valves.

Safety valves were initially used on steam boilers in the industrial revolution. Early boilers devoid of them were apt to accidental explosion. Safety valves evolved to defend equipment as well like the pressure vessels as well as heat exchangers. The name safety valve must be restricted to compressible fluid application (steam, gas, and vapor).

The 2 general kinds of guard encountered in business are flow and thermal protection. For the liquid-packed vessels, thermal valves are usually characterized by comparatively smaller size of a valve essential to give defense from surplus pressure caused by the thermal expansion. In such a case, a small valve is sufficient since most liquids are almost incompressible, and therefore a comparatively small quantity of fluid released through a relief valve would create a considerable decrease in pressure.

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