Air valve introduction
The air valve is a special valve used to prevent the decompression wave in the transient process from creating a negative pressure in the tube. It is usually installed in the normal operation of the pipeline when the hydrodynamic pressure is low, during the transient flow process, there may be a high point of liquid column separation. Air is taken in when the pressure inside the pipe is lower than atmospheric pressure, and is exhausted when the pressure in the pipe rises above atmospheric pressure. During the venting process, the valve automatically closes when the liquid in the tube is filled with tubing, and does not allow liquid to escape into the atmosphere.