In order to control the speed of a hydraulic actuator (cylinder or motor) it is necessary to vary either its displacement or the actuator flow rate. For a standard hydraulic cylinder, varying its displacement (the amount of cylinder piston movement for a given volume of fluid) is not an option since this is determined by the dimensions of the cylinder when it is manufactured.

In order to control the speed of a hydraulic actuator (cylinder or motor) it is necessary to vary either its displacement or the actuator flow rate. For a standard hydraulic cylinder, varying its displacement (the amount of cylinder piston movement for a given volume of fluid) is not an option since this is determined by the dimensions of the cylinder when it is manufactured. Certain types of hydraulic motor however can offer the option for either infinitely variable displacement (between minimum and maximum values) or two discrete displacements (high – low). Of the two, dual-displacement motors are the most common since motors with an infinitely variable displacement capability are relatively complex (and therefore expensive) components. Even dual displacement motors will have a significant cost penalty over equivalent sized fixed displacement units.

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