The function of the valve is to keep liquid or gas so that it cannot pass freely. Different types of valves serve different purposes. Pneumatic ball valve is a valve widely used in aviation kerosene, natural gas, liquefied petroleum gas, pipeline gas and other pipelines. Next, we will learn more about the working principle of the pneumatic ball valve. Working principle of pneumatic ball valve: The key to the working principle of double cut-off, double cut-off, and pressure relief valves is the function of the two sealing slides installed on the cock.
The working principle of the pneumatic ball valve can also be divided into the following parts in detail:
Valve closing: When the valve is closed, first turn the hand wheel to rotate the cock and sealing slide 90°, and then move the cock down. With the movement of the cock, push the sealing slide plate to the surface of the inner cavity of the valve body until the elastic sealing ring is evenly squeezed to the upper and lower ends of the valve hole to form a seal.
Valve opening: When the valve is opened, first turn the handwheel to lift the cock and pull the sealing slide back from the sealing surface on both sides of the valve body. When the slide plate is completely retracted and separated from the sealing surface of the valve body, continue to rotate the handwheel to rotate the cock and seal slide plate 90°, and the valve is in the open position.
About the seal: Elastomeric seals are molded into the grooves of the slide. As the sealing slide moves towards the inlet and outlet of the valve, the sealing ring is gradually pressed into the groove. The surface of the processed slide plate and the inner cavity of the valve form a secondary metal-to-metal seal, which prevents the elastic sealing ring from being continuously compressed and has the function of fire prevention.
Double Close, Double Break and Discharge: This is a method of completely isolating the pipeline at both ends by means of shut-off valves at both ends and a relief valve in the middle. Closing the two main valves and opening the safety valve can increase the safety of the system. If the first valve leaks, the leaked medium can be led out by the opened safety valve.
Double seal mode: Press two independent seal sliders on the upper and lower ends of the valve hole (double shut-off). When the valve is closed, the safety valve is opened to test the sealing effect (safety)
