Manufactures claim on literature that the triple off-set butterfly valves are sealing in both directions. But from experience it is known that the valve does not hold effectively against the normal flow direction. The valve standard API 609 does not address whether there is an inherent design limitation for the valve type. I would like to know user feed back on sealing, especially the larger sized valves larger than 24". Valves used for an on-off service do require to have liquid held on the other side. This may not be normal service but becomes necessary during a turn around.
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