... cooled chillers KC DRYERS DELIVER-PERFORMANCE,RELIABILITY,EFFICIENCY ο 3 Way double air piloted inlet switching valve with viton seals, ... to each tower, Many small competitive air dryers use 4-way sliding spool valves which allow purge air containing abrasive desiccant ... causing rapid seal wear and/or premature failure. ο 2-Way, diaphragm operated, poppet-style purge exhaust valves,designed to handle ...