safety valve, device attached to a boiler or other vessel for automatically relieving the pressure of steam before it becomes great enough to cause bursting. The common spring-loaded type is held closed by a spring designed to open the valve when the internal pressure reaches a point in excess of the calculated safe load of the boiler. Safety valves are installed on boilers according to strict safety regulations.
"safety valve." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. (July 19, 2018). http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/safety-valve
"safety valve." The Columbia Encyclopedia, 6th ed.. . Retrieved July 19, 2018 from Encyclopedia.com: http://www.encyclopedia.com/reference/encyclopedias-almanacs-transcripts-and-maps/safety-valve
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safe·ty valve • n. a valve opening automatically to relieve excessive pressure, esp. in a boiler. ∎ fig. a means of giving harmless vent to feelings of tension or stress.
"safety valve." The Oxford Pocket Dictionary of Current English. . Encyclopedia.com. (July 19, 2018). http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/safety-valve
"safety valve." The Oxford Pocket Dictionary of Current English. . Retrieved July 19, 2018 from Encyclopedia.com: http://www.encyclopedia.com/humanities/dictionaries-thesauruses-pictures-and-press-releases/safety-valve