The opening and closing parts of the fluorine-lined globe valve are plug-shaped discs, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid. The movement form of the valve stem is a lifting rod type (the valve stem is lifted, and the handwheel is not lifted), and there is also a lifting and rotating rod type (the handwheel and the valve stem are rotated and lifted together, and the nut is located on the valve body). The shut-off valve is only suitable for full open and full closing, and is not allowed to be adjusted and throttled.