Double Disc Pump Technology OverviewVideos / November 18, 2020 Penn Valley Pump Double Disc Pumps are a unique type of positive displacement pump. This reciprocating pump technology, based on a ‘non-captive’ free disc design where two discs are staged in the pump housing, wear less for a longer operating life.Learn more about the Double Disc Pump operating principle, patented Maintain in Place hinged housing design as well as applications for this pump technology in industrial, commercial and municipal processes that handle slime, sludge, slurry and more.