For valves that come into contact with alkaline media, is fluororubber or PTFE a better choice for sealing?
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The medium in the pipes is potassium hydroxide and alkaline steam; the operating temperature does not exceed 200°C, with the normal maximum operating temperature being between 180–190°C. The pipe pressure ratings are PN16 and PN64 respectively. Ball valves are planned to be used for opening and closing the pipes. I would like to ask the experts: under these operating conditions, is it better to use fluororubber or PTFE seals for the ball valves?
Neither of these can be used, as they cannot withstand high temperatures
Neither is allowed, as the temperature must not exceed that of these two materials. If other materials can be chosen
None of them work; the temperature is too high. A hard-sealed version can be chosen.
Fluororubber up to 100 degrees, PTFE 130, PFA 150
According to the standard specifications on HG, fluorocarbon seals can be used in temperatures ranging from -20 to 200 degrees, with short-term use possible at 230 degrees. The typical long-term operating temperature for polytetrafluoroethylene is 240 degrees.