We are having reliability issues with our double dump valves. Currently they are Posiflate inflatable seal valves. The process is a somewhat abrasive powder. The valves are cycled every 8 seconds and have a sequence where the chamber between the valves is filled, then the top valve is closed and the chamber is pressurized, then the bottom valve is opened to shoot the product into a pneumatically conveyed line to the rest of the process. Does anyone have a recommendation for a good replacement for these Posiflate valves?
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