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Safety Valves and Pressure-Relief Devices Safety valves and pressure-relief valves are automatic pressure-relieving devices used for over pressure protection of piping and equipment. Safety valves (Fig. A10.32) are generally used in gas or vapor service because their opening and reseating characteristics are commensurate with the properties and potential hazards of compressible fluids. The valves protect the system by releasing excess pressure. Under normal pressure, the valv