Middle cavity automatic discharge system and self-detection method thereof

The invention relates to a middle cavity automatic discharge system and a self-detection method thereof. The middle cavity automatic discharge system is composed of a first pipe joint, a first communicating pipe, a first ferrule angle type needle valve, a second ferrule angle type needle valve, a leak detection pipe, a second communicating pipe, a third communicating pipe, a ferrule type one-way valve, a four-way valve, a fourth communicating pipe, a second pipe joint and a pressure gauge. The first pipe connector is connected with the upstream end or the downstream end of the valve, and the second pipe connector is connected with a valve middle cavity of the valve. The middle cavity automatic relief system is simple in structure and high in integration, automatic pressure relief after overpressure of the middle cavity of the valve can be achieved, the overpressure can be observed, technical personnel can handle the overpressure in time, and safe operation of the valve is guaranteed. 本发明涉及一种中腔自动泄放系统及其自检测方法，所述