Ball valve and gate valve belong to the same type of valve. The difference is that its closing part is a sphere, and the sphere rotates around the center line of the valve body to achieve opening and closing. Ball valves are mainly used in pipelines to cut off, distribute and change the flow direction of media. The ball valve only needs to be operated by rotating 90 degrees and a small rotational torque to close tightly. The completely equal inner cavity of the valve provides a straight-through flow channel with little resistance for the medium. It is generally considered that the ball valve is most suitable for direct opening and closing, but recent developments have designed the ball valve to have throttling and flow control. The main feature of the ball valve is its compact structure, easy operation and maintenance, suitable for general working media such as water, solvent, acid and natural gas, and also suitable for media with harsh working conditions, such as oxygen, hydrogen peroxide, methane and ethylene, etc. The ball valve body can be integral or combined.