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The pressure relief valve is a type of valve used to control or limit the pressure in a system or vessel which can build up by a process upset, instrument or equipment failure, or fire.The pressure is relieved by allowing the pressurized fluid to flow from an auxiliary passage out of the system.ressure Relief Valves. Pressure Relief Valves protect against excessive pressure in pump stations, distribution systems, and transmission mains by opening when the inlet pressure exceeds a preset value and discharges high pressure water to waste pump suction or a zone of lower pressure.
Difference bw safety valve and relief valve. Relief Valve â is the term used to describe relief device on a filled vessel. For such a valve the opening is proportional to increase in the vessel pressure. Hence the opening of valve is not sudden, but gradual if the pressure is increased gradually.