Ball valve, which is driven by the valve stem and rotates around the axis of the ball valve. It can also be used for fluid regulation and control. There is a strong shear force between the V-shaped ball core of the hard-sealed V-shaped ball valve and the metal valve seat of hard-welded carbide. It is especially suitable for the medium containing fiber and small solid particles. On the pipeline, the multi-pass ball valve can not only flexibly control the confluence, diversion and flow direction of the medium, but also close any channel to connect the other two channels. This type of valve shall generally be installed horizontally in the pipeline. The ball valve is divided into pneumatic ball valve, electric ball valve and manual ball valve according to the driving mode.