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Individual piston check valves direct flow from the inlet side of the pump to the outlet port in these high pressure hydraulic pumps. The positive-seating checkball valves provide better wear and high volumetric efficiency, especially at high pressure. These checkball pumps operate at pressures to 20 000 psi (1380 bar).
During checkball pump operation, a fixed-angle wobble (cam) plate rotates with the drive shaft, causing the pistons to reciprocate. During its suction stroke, each piston is filled through its inlet check valve. During compression, the inlet check valve closes and pressure in the pumping chamber rises until it exceeds load pressure. The outlet checkball then lifts off its seat and fluid is pumped out of the chamber.
Details:
PF1000H-10 Series
PF3000H-10 Series
PF4000H-30 Series