We continually have reliability problems with industrial-grade, rubber-lined butterfly valves that we use for onstream isolation of our cooling water (sea water)exchangers. We have tried them all --- Crane Centerline, Keystone, etc. We need to be able to find a source for this type of valve (or perhaps an alternate valve type) that we can rely on for both high reliability AND on-the-shelf availability. I am considering trying-out some rubber-lined knife gate valves that are apparently used for corrosive slurry applications. Does ANYONE have any suggestions? This has been a long-term problem at our plant. Thanks for your cooperation! Some butterfly valves with buna-N lining and seats had swelling of the rubber so that the valves could not shutoff. Replacement valves with EPDM rubber seats appear to have better life. Other butterfly valves with metallic disk (AL-BRZ, or 316SS epoxy coated) with the EPDM seats are also being tried.Supposedly some epoxy FRP valves are in seawater service, and the unique feature about them is a fire-test rating(!) for oil production platform firewater installations.

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