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The safety valve is an automatic pressure relief device opened by the static pressure at the inlet. Its function is to quickly discharge a certain amount of medium when the pressure in the container exceeds a certain value. When the pressure inside the container drops to the allowable value, the pressure in the container is always lower than the upper limit of the allowable pressure, so the safety valve is also called the final protection device of the pressure vessel. Safety valve according to the working pressure can automatically open and close, generally installed in the closed system equipment or pipelines to protect the system safety. Safety valve is an automatic valve, the control pressure does not exceed the specified value, and its opening and closing pieces by the external force in the normally closed state, automatically open when the specified value, the media from which to release, decompression; when the pressure back to normal , The valve automatically closed. The role of safety valve is to prevent the pipeline or device in the media pressure exceeds the specified value.