Swing-type fluorine-lined check valve is an automatic anti-corrosion valve which relies on the flow of the medium itself and automatically opens and closes the disc to prevent the reverse flow of the medium. It is also called a check valve or a one-way valve. It is specially used to control corrosive or strong corrosive media. The inner surface of the valve body is covered with various fluoroplastics, which have the characteristics of high strength and good corrosion resistance. It is suitable for different working temperatures and fluid pipelines to prevent the one-way opening and closing of medium countercurrent on various pipelines or equipment. The valve shaft and disc of swing fluorine-lined check valve are designed as a whole. All the fluorine-lined plastic axles are embedded in the special groove formed between the valve body and the valve cover. They are flexible in opening and closing and reliable in sealing. In addition, besides the valve body and disc, the reset spring is also lined with corrosion-resistant fluoroplastics. A reasonable spring is designed so that the disc can generate enough sealing specific pressure in the low-pressure area, which ensures the reliability of the valve sealing in the low-pressure area.