Patent ID: 8376716
Filing Date: 2013-02-19
Classification: F04B

Abstract:
1. A pump system for pumping a viscous material, the pump system comprising: N positive displacement pumps, where N is an integer greater than two, each pump having an inlet and an outlet therefrom and having a first material housing cylinder with a first piston disposed therein and a second material housing cylinder with a second piston disposed therein, both pistons movable in a reciprocating stroke cycle that includes a discharging stroke and a filling stroke, wherein the first piston is arranged and operates substantially 180° out of phase from the second piston such that when the first piston is subject to the filling stroke the second piston is subject to the discharging stroke; and a hydraulic drive connected to the N positive displacement pumps to reciprocate each piston within each material housing cylinder so that the discharging strokes and the filling strokes of the N positive displacement pumps are staggered from one another by 1/N stroke positions such that no two pumps have pistons in the same filling stroke position or discharging stroke position at the same time.