The opening and closing parts of the ball valve is a ball with a circular channel, rotating around the axis perpendicular to the channel, the ball rotates with the valve stem to achieve the purpose of opening and closing the channel. Ball valves only need to rotate 90 degrees of operation and a small turning torque can be closed tightly. According to the needs of the working conditions, the assembly of different driving devices to form a variety of different control methods of ball valves, such as electric ball valves, pneumatic ball valves, hydraulic ball valves and so on.

Ball valve working principle:

When the ball valve rotates 90 degrees, in the inlet and outlet should all present a spherical surface, so as to close the valve, cut off the flow of media.

When the ball valve rotates 90 degrees, in the inlet and outlet should all show the ball mouth, thus opening the flow, and basically no flow resistance.

Ball valve structure principle: 

1. Ball valve is not subject to installation direction, the flow of media can be arbitrary. Fluid resistance is small, the full diameter of the ball valve is basically no flow resistance.

2. Ball valve structure is simple, relatively small size, light weight, easy to maintain.

3. Tight and reliable. It has two sealing surfaces, and the current ball valve sealing surface materials widely used in a variety of plastics, good sealing, can achieve complete sealing. In the vacuum system has also been widely used.

4. The ball valve is suitable for frequent operation, opening and closing quickly, lightweight. Easy to operate, open and close quickly, from fully open to fully closed as long as the rotation of 90 °, easy to control from a distance.

5. Convenient maintenance, ball valve structure is simple, the seal is generally active, disassembly and replacement are relatively convenient.

6. Ball valve sealing performance is good. In the fully open or fully closed, the ball and the sealing surface of the valve seat and the media isolation, the media through, will not cause the valve sealing surface erosion.

7. Wide range of applications, from small diameter to a few millimetres, up to several metres, from high vacuum to high pressure can be applied.

8. Because the ball valve in the opening and closing process of wiping, so can be used in the medium with suspended solid particles.

9, the ball valve fluid resistance is small, no vibration, low noise.