In the valve sealing material, what circumstances are PTFE, PEEK, VITON selected separately in?
PTFE is generally used in corrosive medium temperature less than 204 degrees in the low pressure valve sealing surface, can also be used for gaskets and packings.
PEEK is generally used for sealing surface of high-pressure ball valve.
VITON is fluorine rubber, cold flow ratio above two, the most used O ring seal.