A new patent-pending seal for piston-type screen changers and divert valves is designed for leak-free processing of low-viscosity materials, such as hot melt adhesives (HMA) and cleaning solvents such as, but not limited to, acetone, toluene, hexane, and heptane. The new PSI-Polymer Systems Inc.'s (Conover, NC) seal is capable of operating at temperatures up to 520°F.
PSI received a U.S. patent (No. 7,147,774 B2) for a segmented seal design in early 2007. This latest seal is designed to work with discontinuous and continuous piston-type screen changers and polymer divert valves. PSI will show the new patent-pending seal design installed in a continuous screen changer at NPE 2012.
PSI-Polymer Systems supplies polymer filtration equipment, gear pumps, static mixers, divert valves, and engineered system solutions for the plastics extrusion, polymer processing and recycling.