TDF series high-performance fluorine-lined butterfly valve applies middle-line fluorine-lining structure. Both valve body and plate are lined with PTFE or F46 material, which has strong anti-corrosive performance, so it can effectively avoid the erosion of valve from strongly corrosive mediums, with good sealing performance. This type of butterfly valve is used mainly on controlling corrosive flows in industries, for example, chemical plants, and is an ideal resolution for regulating and cutting-off all kinds of chemical corrosive mediums.