A safety valve that relieves pressure when it becomes high but before it becomes dangerous
Valve that opens to protect steering or other hydraulic system when pressure becomes too high
Valve that opens an outlet when a set pressure is reached; used to protect pipes and equipment from being damaged by over-pressure
a valve in a container in which pressure can build up (as a steam boiler); it opens automatically when the pressure reaches a dangerous level
A device designed to relieve excess pressure by opening and closing at a set pressure
A safety device that automatically releases water due to an excessive buildup of pressure and temperature; used on a water heater
A valve that opens to relieve excess temperature and/or pressure in the system See T&P Valve Back to alphabetical list
A spring loaded pressure relief valve actuated by the static pressure upstream of the valve The valve opens normally in proportion to the pressure increase over the opening pressure (557)
A safety device to allow the escape of stem or hot water subjected to excessive pressure of temperatures