equipment class
A self operating valve that is set to open at a certain pressure level to prevent the pressure in a container or system from reaching unsafe levels.
A physical object that is a pressure relieving device designed to burst at a calibrated pressure to prevent pressure in systems or vessels from reaching unsafe levels.
A relief valve that is used for pressure compensation purposes by admitting (letting in) a pressure to prevent that vacuum is forming when filling or emptying a system.
A fluid regulator that relieves pressure from an enclosed space when the pressure reaches a predetermined value.