Cast steel ball valve opening and closing parts are driven by the stem, and around the axis of the valve stem for the movement of the valve, mainly used to cut off or connect the pipe in the medium, can also be used for fluid regulation and control, hard seal V-type ball valve surfacing carbide alloy metal seat between the strong shear force, particularly suitable for fiber, micro-solid particles and other media. Generally divided into handle cast steel ball valve, pneumatic cast steel ball valve, electric cast steel ball valve, cast iron ball valve, stainless steel ball valve, copper ball valve.