How Does The Breather Valve Work? What Does It Do?

A breather valve is a device used to control the balance of air pressure inside and outside a storage tank or container, and its working principle is based on the difference in internal and external pressure.
Working principle of the breathing valve: When the internal pressure of the tank is higher than the external pressure, the breathing valve's exhalation valve (pressure valve) will be opened to discharge the gas from the tank to prevent the internal pressure of the tank from being too high. Conversely, when the internal pressure of the tank is lower than the external pressure, the suction valve (vacuum valve) of the breathing valve will open to allow air to enter the tank to prevent the internal pressure of the tank from being too low. This role of the breather valve helps to maintain the safe operation of the tank and prevent tank deformation or rupture due to pressure changes.
The main function of the breathing valve is to control the pressure balance inside the storage tank, reduce the volatilization of the medium, prevent the damage of the storage tank caused by overpressure or vacuum, and also reduce the evaporation loss of the storage liquid. The breathing valve is usually composed of a seat, a valve cover, a protective cover and two groups of opening and closing devices controlled by vacuum and pressure. The breather valve is designed so that the pressure valve and the vacuum valve cannot be open at the same time, thus maintaining the tightness and integrity of the tank.