What is the difference between fluorine lined butterfly valve and rubber lined butterfly valve

What is the difference between the fluorine-lined butterfly valve and the rubber-lined butterfly valve? The two valves are different and cannot be interchanged for the following reasons: 1. The key difference between the rubber-lined butterfly valve and the fluorine-lined butterfly valve is the material of the lining, and the rubber refers to nitrile. Rubber or Buna rubber, this rubber is elastic and suitable for general water, oil and other media, but the temperature should not be too high. Fluorine is PTFE (polytetrafluoroethylene) or fluorine rubber. This rubber is relatively hard and easy to wear. It is suitable for corrosive media, and its temperature is higher than that of nitrile rubber and Buna rubber. 2. The structure of the rubber-lined wafer butterfly valve and the fluorine-lined wafer butterfly valve is the same. The difference between the two is only limited to the material of the sealing surface of the valve seat. One is ordinary rubber and the other is fluorine rubber. 3. The rubber-lined flanged butterfly valve and the fluorine-lined flanged butterfly valve are not only different in the material of the valve seat seal, but also in the structure.
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