When the water enters the pipeline, the float stops at the lower part of the ball barrel for a large amount of exhaust, and when the air is exhausted, the ball floats up in the water inlet valve, and the transmission valve disc is closed to stop the exhaust. A small amount of gas will naturally be produced in the operation of the pipe, which will be concentrated in the upper part of the pipe, and to a considerable extent, the water level in the valve will drop, the float will descend down the water, and the gas will be discharged from the small hole. If there is a power outage or pump outage, negative pressure will occur when the water in the pipe is empty. The float descends down the water, opens the small hole and drives the large hole to make a large amount of air to ensure the safety of the pipeline.

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