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When the pilot valve reaches set pressure it opens and releases the pressure from the dome. The piston is then free to open and the main valve exhausts the system fluid. The control pilot opens either to the main valve exhaust pipe or to atmosphere. Snap acting At set pressure the valve snaps to full lift.
A relief valve DN25 on cooling water pipe from heat exchanger Schematic diagram of a conventional spring-loaded pressure relief valve. A relief valve or pressure relief valve (PRV) is a type of safety valve used to control or limit the pressure in a system; excessive pressure might otherwise build up and create a process upset, instrument or equipment failure, explosion, or fire.
Pentair sold off its papermaking business to Consolidated Papers Inc. in 1997. [12] While paper had been the backbone of Pentair's business it only amounted to about 10% of their revenue at the time of the sale. [11] In August 1999, Pentair bought the DeVilbiss Air Power Company for $460 million in cash. [16]