Ball valve (ball valve), the opening and closing member (ball) driven by the stem, and rotational movement around the axis of the ball valve valve. It can also be used for fluid regulation and control, including hard seal V ball valve with a strong shear force between the V-shaped ball core and the metal seat of the welded carbide, especially for media containing fibers, tiny solid particles, etc.. The multi-way ball valve in the pipeline not only can flexibly control the media merging, diverging, and switching of flow direction, but also can close any channel and make the other two channels connected. This type of valve in the pipeline should generally be installed horizontally. Ball valve is divided into: pneumatic ball valve, electric ball valve, manual ball valve according to the drive mode.