Ball valve is evolved from the plug valve. It has the same rotation 90 degrees to mention the action, the difference is that the plug body is the sphere, with a circular through hole or channel through its axis. The ratio of the spherical and the channel should be such that when the ball rotates 90 degrees, the entire surface of the entrance and exit should be spherical, thus breaking the flow.
The ball valve only need to rotate 90 degrees of operation and a small turning torque can be closed tight. The fully equal body cavity provides a very small, straight passage for the medium. It is generally believed that the ball valve is most suitable for direct opening and closing use, but the recent development has designed the ball valve so that it has throttle and control flow.
The main features of the ball valve itself is compact, easy to operate and repair, suitable for water, solvents, acids and natural gas and other general working medium, but also for poor working conditions such as oxygen, hydrogen peroxide, methane and ethylene. Ball valve body can be integrated, it can be modular.
Now, according to the needs of consumers, the ball valve is given more features, more comprehensive classification. According to the different connection methods, the ball valve is divided into wire ball valve, PPR ball valve, welding ball valve, flange ball valve, aluminum pipe ball valve. According to the functional classification, the ball valve is divided into temperature ball valve, filter ball valve. Classification of a variety of functions and more complete.