Regulating arrangement for hydraulic pumps

An hydraulic system, comprising, in combination, a common drive machine;

• a plurality of adjustable-volume pumps driven by the common drive machine and each having a respective volume-adjustment means;
• a plurality of hydraulic consumers each receiving fluid from and driven by a respective one of the adjustable-volume pumps;
• a plurality of control valves individually settable by the user of the hydraulic system, each located in the fluid path leading from a respective one of the pumps to a respective one of the consumers;
• a plurality of pressure regulators, each associated with and regulating the output of a respective one of the adjustable-volume pumps by automatically adjusting the setting of the respective volume-adjustment means;
• a plurality of first transducers operative for generating first signals indicative of the settings of respective ones of the volume-adjustment means;
• a plurality of second transducers operative for generating second signals indicative of the settings of respective ones of the control valves;
• and control means operative for maintaining the settings of the volume-adjustment means in correspondence with the settings of the control valves by automatically altering the operation of the pressure regulators in response to discrepancies between the settings indicated by the first and second signals.