Graco Inc.

Eugene H Styer

William A Weikel

John A Yedinak

James M Nelson

In a priming piston loading double acting pump for high viscosity materials, the shovel plate assembly is formed of a flexible, abrasion resistant disk or cup. The disk may be made from silicon rubber and the cup may be made from a glass filled Teflon polytetrafluoroethylene material. The clearance between the plate assembly and the intake cylinder is essentially zero to allow for a build-up of a vacuum as the plate assembly moves downwardly and out of the intake cylinder to greatly enhance the loading ability of the pump.

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Antioch, IL, United States of America

Eugene H Styer