Lined butterfly valves rely on elastomers (rubber) and/or polymers (PTFE) to completely isolate the valve body and stem journal area from the corrosive and/or erosive effects of the line media. When the body and stem journal area are isolated from the line media, the valve is considered a "non-wetted" design. By isolating the valve body and stem with rubber or PTFE, it is not necessary for the valve body to be made of expensive corrosion-resistant materials such as stainless steel, Alloy 20 and C-276.

When the valve body and journals are exposed to the line media such as in gate valves, globe valves and lubricated plug valves, the valve is considered to have "wetted" parts.

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