Features of air valve

The air valve is a special valve used to prevent negative pressure in the pipe caused by the transient pressure reduction wave. It is usually installed at a high point where the hydrodynamic pressure of the pipeline is low during normal operation, and the liquid column separation may occur during the transient flow process. When the pressure in the pipe is lower than atmospheric pressure, air is sucked in, and when the pressure in the pipe rises higher than the atmospheric pressure, air is discharged. During the exhaust process, the valve can be automatically closed when the liquid in the pipe is full of the pipe, and the liquid is not allowed to leak into the atmosphere.

There is usually a certain amount of gas dissolved in water, and the degree of dissolution of this gas varies with the temperature and pressure of the water. In the water delivery process, some gas is also brought into the pipeline with the water flow. These gases are mixed in the water flow and gradually released, accumulate on the top of the pipe, compress the water section, and increase the additional head loss during the water delivery process. Therefore, it must be timely Exclude through the air valve.

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