The sanitary ball valve was introduced in the 1950s and has rapidly developed into a major valve category. In industrially developed countries, the use of ball valves is increasing year by year. It is widely used in the chemical, paper, pharmaceutical, water conservancy, electric power, municipal, steel and other industries. The cock of the ball valve is a sphere that can be rotated 90 degrees. It has a circular through-hole or passage through its axis. The ball valve is mainly used in the pipeline to cut, distribute and change the flow direction of the medium. The ball valve is most suitable for use as a switch or shut-off valve. When…