Plattco designs and manufacture only the highest quality double flap airlock valves, knife gates, and isolation slide gates that are used for feed and discharge of product or waste in over 100 industries worldwide. We are an integrated manufacturer, with our own engineering, pattern shop, foundry and machine shop in Plattsburgh, New York. Plattco Corporation owns several U.S. and International patents and is the premier innovator in the solid materials handling valve business.