The gairui Bronze Safety Valve Copper safety valve is a kind of automatic control and protection valve. He does not rely on any external force, but uses the force of the medium itself to discharge a certain number of media, so as to prevent the pressure within the system from exceeding the predetermined safety value. When the pressure is restored to normal value, the safety valve is automatically closed to prevent the medium from continuing to be excluded. It is suitable for pressure control and protection of pressure system such as boiler, hydraulic press, hydraulic press, air compressor, air conditioner and so on.