The all-weather breathing valve is installed on the top of the storage tank to solve the problem of positive and negative pressure gas inside the tank, so that the liquid in and out of the tank is not obstructed. When the external liquid enters the tank, a large amount of gas is exhaled (called positive pressure). When the liquid inside the tank is output to the outside, it must be sucked into the tank from the outside air (called negative pressure). If the breathing valve automatically closes when it stops working, it will not leak the liquid and gas inside the tank, which ensures the quality of the liquid inside the tank.