Development and working principle The ball valve evolved from the plug valve. It has the same lifting action by rotating 90 degrees, but the difference is that the cock body is a sphere with a circular through hole or channel passing through its axis. The ratio between the spherical surface and the passage port should be such that when the ball rotates 90 degrees, the inlet and outlet should all present a spherical surface, thereby cutting off the flow advantages 1. The fluid resistance is small, and its resistance development and working principle The ball valve is made of a cock. The valve evolved. It has the same lifting action by rotating 90 degrees, but the difference is that the cock body is a sphere with a circular through hole or channel passing through its axis. The ratio of the spherical surface to the channel opening should be such that when the ball rotates 90 degrees, the entrance and exit points should all be spherical, so as to cut off the advantages of flow 1. The fluid resistance is small, and the resistance coefficient is equal to the pipe section of the same length. 2. Simple structure, small size and light weight. 3. It is tight and reliable. At present, the sealing surface material of the ball valve is widely used in plastics, with good sealing performance, and it has also been widely used in the vacuum system. 4. Convenient operation, rapid opening and closing, only need to rotate 90° from fully open to fully closed, which is convenient for remote control. 5. Convenient maintenance, simple structure of the ball valve, generally movable sealing ring, easy to disassemble and replace. 6. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium. When the medium passes, it will not cause erosion of the valve sealing surface. 7. A wide range of applications, with a diameter ranging from a few millimeters to a few meters, from high vacuum to high pressure. The ball valve can be closed tightly with only a 90-degree rotation and a small torque. The completely equal internal cavity of the valve provides a straight flow channel with little resistance for the medium. It is generally considered that the ball valve is most suitable for direct opening and closing, but recent developments have designed the ball valve to throttle and control the flow. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene. The ball valve body can be integral or combined.
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