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Classification of air valves

Views: 26     Author: Site Editor     Publish Time: 2021-12-02      Origin: Site

Air valve including Single orifices air valve, automatic double orifices air valve, double orifices air valve with inner isolation.

1. Single orifice air valve: The single air valve is a barrel-type valve body, and its internal structure mainly has a floating ball. There are two types of single air valves: threaded and flanged. When the pipe starts to fill with water, the floating ball will slowly float upwards, and the valve has been vented at this time. When a certain pressure is reached, the floating ball tightly supports the rubber ring, indicating that all air has been discharged from the exhaust nozzle.

2. Automatic double orifices air valve: During the operation of the pipeline, if the air dissolved in the water separates and accumulates in the air valve body, the floating ball loses its buoyancy and falls automatically. If the air volume is small, the floating ball of the small hole will fall to exhaust; if the air volume is large, the floating ball of the large hole will fall to exhaust. The drop of the floating ball reaches the time when the water pressure in the pipe is balanced with the gravity of the floating ball. After the exhaust is completed, the float returns to the position where the air hole is closed.

When the pressure in the pipe is reduced to form a negative pressure, although the valve body is full of water, because the pressure in the valve is lower than the atmospheric pressure, under the action of the difference between the atmospheric pressure and the pressure in the pipe, the floating ball falls to supplement air. The floating ball with a large hole falls, and when the pressure drops greatly, the floating ball with a small hole falls. Due to the different falling time of the two floats, the pressure fluctuations in the pipeline are buffered.

When the pressure in the pipeline increases, the water flow begins to flow backwards, the floating ball in the falling state opens the air hole and exhausts air until the air valve is filled with water, the float ball floats, and the valve hole is closed. During the closing process, due to the different pressure effects of the large and small vent holes, the floating ball of the large hole first lifts up and closes, and then closes the small hole, delaying the full closing process, and alleviating the pressure rise when the water column is closed again.

3.Double orifices air valve with inner isolation: When the gas in the pipeline needs to be discharged, the valve stem should be rotated counterclockwise to make the valve stem and the valve disc rise, so that the air in the pipeline enters the valve body under the pressure of water, and from The exhaust nozzle is discharged. As the water in the pipeline fills the valve body, the floating ball moves upward under the buoyancy of the water to block the exhaust nozzle and achieve self-sealing. In the normal operation of the pipeline, the air in the water is under pressure. Continuously discharged into the upper part of the valve body of the exhaust valve, forcing the floating ball to descend and leave the original sealing position. At this time, the air is discharged from the exhaust nozzle. Then, the floating ball returns to the original position to self-seal. Therefore, during normal operation of the valve, the valve is always open, the floating ball continuously repeats the above actions, and the air is continuously discharged. When the valve body needs to be repaired or cleaned, the valve should be closed.



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