Safety valve is a special valve that prevents the pressure of the medium in the pipeline or equipment from exceeding the specified value by discharging the medium outside the system when the medium pressure in the equipment or pipeline rises above the specified value. . Safety valves are automatic valves that are mainly used in boilers, pressure vessels and pipelines to control pressure not to exceed specified values ​​and play an important role in protecting personal safety and equipment operation. Note: The safety valve must pass the pressure test before it can be used.