The opening and closing part of a ball valve is a ball with a circular channel, which rotates around the axis perpendicular to the channel. The ball rotates with the valve stem to achieve the purpose of opening and closing the channel. The ball valve can be tightly closed with only 90 degrees of rotation and a small rotational torque. According to the working conditions, different driving devices can be assembled to form various control methods of ball valves, such as electric ball valves, pneumatic ball valves, hydraulic ball valves, and so on.
When the ball valve rotates 90 degrees, both the inlet and outlet should present spherical surfaces, thereby closing the valve and cutting off the flow of medium

When the ball valve rotates 90 degrees, all ball ports should be present at the inlet and outlet to open the flow, and there is basically no flow resistance.

Principle of Ball Valve Structure:

1. Ball valves are not limited by the installation direction, and the flow direction of the medium can be arbitrary. The fluid resistance is small, and full diameter ball valves have almost no flow resistance

2. The ball valve has a simple structure, relatively small volume, light weight, and is easy to maintain

3. Tight and reliable. It has two sealing surfaces, and currently the sealing surface materials of ball valves are widely used with various plastics, which have good sealing performance and can achieve complete sealing. It has also been widely used in vacuum systems

4. Ball valves are suitable for frequent operation, with quick and lightweight opening and closing. They are easy to operate and can be opened and closed quickly. From full opening to full closing, they only need to rotate 90 ° for remote control

5. Convenient maintenance, simple ball valve structure, and generally movable sealing rings make disassembly and replacement more convenient

6. The ball valve has good sealing performance. When fully open or fully closed, the sealing surfaces of the ball and valve seat are isolated from the medium. When the medium passes through, it will not cause erosion of the valve sealing surface

7. It has a wide range of applications, with diameters ranging from a few millimeters to several meters, and can be applied from high vacuum to high pressure

8. Due to the wiping nature of ball valves during opening and closing, they can be used in media with suspended solid particles

9. Ball valve has low fluid resistance, no vibration, and low noise