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The all-weather breathing valve is installed on the top of the tank, which is to solve the positive pressure and negative pressure of the gas in the tank, so that the liquid in the tank is not obstructed, and when the external liquid enters the tank, a large amount of gas is called out (called positive pressure). If the liquid in the tank is exported outward, the inside of the tank must be sucked into the tank from the outside air (called negative pressure). If the breathing valve is automatically closed when the work is stopped, the liquid gas in the tank will not leak out, so that the liquid quality in the tank is favorably guaranteed