Speed Control of a Hydraulic Motor

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Figure 1.12 shows the speed control circuit of a hydraulic motor using a pressure-compensated FCV.The operation is as follows:
– In a spring-centered position of the tandem four-way valve, the motor is hydraulically blocked.
– When the valve is actuated to the left envelope, the motor rotates in one direction. Its speed can be varied by adjusting the throttle of the FCV. Thus, the speed can be infinitely varied and the excess oil goes through the PRV.
– When the valve is deactivated, the motor stops suddenly and becomes locked.
– When the right envelope is in operation, the motor turns in the opposite direction. The PRV provides overload protection if, for example, the motor experiences an excessive torque load.

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