The ball valve has the same 90 degree rotation, except that the plug body is a sphere with a circular through hole or passage through its axis. Ball valve in the pipeline is mainly used to cut off, distribute and change the flow direction of the medium, it only needs to rotate 90 degrees of operation and a small turning moment can be closed tight. Ball valves are best suited for switching and shut-off valves, but recent developments have designed ball valves to provide throttling and control flow, such as V-ball valves. The main features of the ball valve is its compact structure, reliable sealing, simple structure, easy maintenance, sealing surface and the spherical surface is often closed, easy to be media erosion, easy to operate and repair, suitable for water, solvents, acids and natural gas and other general work Media, but also for poor working conditions of media, such as oxygen, hydrogen peroxide, methane and ethylene, etc., are widely used in various industries. Ball valve body can be a whole, it can be combined. Advantages 1. Small fluid resistance, full diameter of the ball valve basically no flow resistance. 2. Simple structure, small size, light weight. 3. Close and reliable. It has two sealing surfaces, and the ball valve sealing surface material widely used in a variety of plastic, good sealing, can achieve a complete seal. In the vacuum system has also been widely used. 4. Easy to operate, quick opening and closing, as long as 90 ° rotation from full open to full close, easy to remote control. 5. Easy maintenance, ball valve structure is simple, the seals are generally active, demolition and replacement are more convenient. 6. In the fully open or fully closed, the ball and valve seat sealing surface and media isolation, the media will not cause erosion of the valve sealing surface. 7. Wide range of applications, the path from small to a few millimeters, up to a few meters, from high vacuum to high pressure can be applied. 8. Because the ball valve in the process of opening and closing wipe, it can be used for medium with suspended solid particles.