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Variable  Disp. Pump-PVA
P=160Bar, Displacement=16~100 cm3/rev



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— The PVA pumps are variable displacement vane pumps with piloted type hydraulic
pressure compensator.
— They permit instantaneous adjustment of the flow rate according to the circuit
requirements.The consequence is that energy consumption is reduced and adequate
in every cycle phase.
— The pumping group is complete with hydrostatic axial compensation distribution plates
that improve the volumetric efficiency and reduce wear of the components.
— The pressure compensator operates with the principle of keeping the cam ring of the
pumping group in the eccentric position with use of a piston controlled hydraulically by
a pressure pilot stage.
— When the delivery pressure equals the pressure corresponding to the pilot stage
setting, the cam ring is moved toward the center adjusting the flow rate to the plant
— In zero flow demand conditions, the pump delivers oil only to compensate any
possible bleedings and pilotings, keeping the circuit pressure constant.
— The compensator response times are very restrained and such as to allow elimination
of the pressure relief valve.
— Also available are the versions with maximum flow adjustment PVA***
Q and with the
device for selection of two independent pressure values with solenoid valve PVA***M