PSI-Polymer Systems Inc., Conover, N.C., has introduced a new seal for its piston-type screen changers and diverter valves. The patent-pending seal is designed for leak-free processing of low-viscosity materials, such as hot-melt adhesives and cleaning solvents such as acetone, toluene, hexane, and heptane. The new seal is capable of operating at temperatures up to 520 F. This seal is designed to work with discontinuous and continuous piston-type screen changers and polymer diverter valves. PSI will show the new seal on a continuous screen changer at NPE 2012, April 1-5 in Orlando, Fla
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