Fluorine lined valve has double functions of switching and flow regulation, which can easily open and close the gas circuit without affecting the flow and ensuring the repeatability of flow. Slow opening reduces the impact of instantaneous pipe pressure on the instrument. A damper is provided to greatly extend the life of the fluorine lined valve. Fluorine lined valve is specially used to control corrosive or highly corrosive medium. The surface of the valve body is covered with various kinds of fluoro plastics, which is suitable for different working temperature and fluid pipeline, which is characterized by high strength and good corrosion resistance.