Safety & Relief Valves

Introduction
A pressure relief valve is a safety device designed to protect a pressurized vessel or system during an overpressure event. An overpressure event refers to any condition which would cause pressure in a vessel or system to increase beyond the speccified design or maximnu allowable working pressure relief valve and safety devices, there are many codes and regulation written to control their design and application the purpose of this discussion is to familiarize you with the varius parameters involved in the design of a pressure relief valve and provide brief introduction to same od the Codes and Standards which govern the design and use of pressure relief valves.

Many electronic, pneumatic, and hydraulic system exist today to control fuild system variables, such aspressure, temperature, and flow. Each of these system requires a power source of sometype. such as electricity or compressed on oder to operate. A pressure relief valve must be capable of operating all the time, especaillyduring a perriod of power failure when system controls are nonfunctional. The sole of power for the pressure relief valve, is the precess fluid.