... excavator, compactor, paver, etc.Sauer PV series Axial piston variable displacement pumps, Series 20, are of swash plates construction with variable ... rate is proportional to the pump´s driven speed and displacement, which, in turn, is determined by the swash plate ... plate to the opposite side of the neutral or zero displacement position. Concrete Mixer Sauer PV, SPV Hydraulic Piston Pump SPV21 SPV22 ...