Fluorine lined ball valve is a ball with a round hole as the opening and closing parts, the ball rotates with the valve stem around the center line of the valve body to achieve the valve open and close. Using special molding process, so that the sealing surface is dense and good, coupled with the combination of V-type PTFE packing so that the valve to achieve zero leakage; ball and stem cast as one, eliminating the possibility of pressure changes caused by the valve stem out of the pressure components, to ensure the safety of the use of the fundamentals; the use of full plastic lining process, resistant to strong corrosion of the medium.