How The Pumps Work

During pump operation, check valves in each piston open & close.  This directs flow from the inlet side of the pump to the pump outlet port.

A fixed-angle wobble plate rotates with the drive shaft. The angled suface imparts a reciprocating motion to the pistons, which move in & out of their bores in the stationary barrel.

During its suction stroke, each pistion is filled through its inlet check valve.

During compression, the inlet check valve closes & pressure in the pumping chamber rises until it exceeds load pressure.  The outlet checkball then lifts off its seat & fluid is pumped across the check valve, out of the chamber.

The outputs from each piston are combined in the pump barrel or cover & discharged from the pump outlet.