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When the pipeline begins to fill the water, the valve disc is in the open position, a lot of exhaust, when the air is discharged, the valve is filled with water, the float rises and drives the valve disc to close, stop the exhaust, when the water in the pipe is normally transported, if there is a small amount of air gathered in the valve to a considerable degree, the water level in the valve drops, at this time the air is discharged by the small hole. When the water pump stops, the water flow in the pipe is empty or negative pressure is generated in the pipe, and the plug head is quickly opened to inhale air to ensure the safety of the pipeline. Medium temperature: 0-80ºC The main parts are as follows: