Ball valve, a valve whose opening and closing parts (ball) are driven by the stem and rotate around the axis of the ball valve. It can also be used for fluid regulation and control. The V-type ball valve with hard seal has a strong shear force between the V-type ball core and the metal seat overlaid with cemented carbide. It is especially suitable for medium containing fibers and small solid particles. The multi-way ball valve can not only flexibly control the confluence, diversion and flow direction switching of medium, but also close any channel and connect the other two channels. This kind of valve should be installed horizontally in the pipeline. Ball valve is divided into pneumatic ball valve, electric ball valve and manual ball valve according to driving mode.