Smart Actuation of Pumps and Valves (.PDF Download)

The trend in today’s mobile hydraulic system design is to use electrohydraulic proportional valves to transmit only enough engine power to drive the specific loads for a job. Because it is not practical to control valves sized for flow rates of 50 l/min (13 gpm) or more directly by proportional solenoids, pilot stages come into play. The pilot stage taps into a machine’s main hydraulic system for pressurized fluid to provide the force needed to control position of spools in large valves...

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