I am working on a project specs and it asks for butterfly valve with dry shaft design. Media is seawater. As I searched on the web, I saw that mostly concentric btv vendors are naming their product as dry shaft design. Is it so? Personally I can not accept that shafts are can stay dry especially after a certain time of operation. I would be grateful to receive comments of experts.Concentric butterfly valves are inherently "dry-shaft" as the seat itself should seal against shaft as well as disc.of course, the possibility of a malfunction exists, but that is always the case regardless of valve design.All butterfly valves are designed to be dry shaft, but depending on the application, the replacement frequency is higher than with other valves, to avoid leaks. Pressure/temperature also influences how long the valve will remain completely dry. Make sure you get to talk to plant engineers who have used the valve brand you consider buying!

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