The pressure relief valve is a protective device that can protect the engine and turbine. When the pressure in the equipment or pipeline exceeds the pressure set by the pressure relief valve, it will automatically open the pressure relief to ensure that the equipment and pipelines The internal medium pressure is under the set pressure to protect its equipment and pipelines and prevent accidents. Therefore, it is a protection device that can automatically open and close according to the working pressure of the system. It is generally installed on equipment or pipelines in closed systems to protect the safety of the system.