Title: Control for quickly effecting displacement changes in a pump supplying fluid to primary and secondary function control valves

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Abstract: A hydraulic system includes a primary function control valve connected to the output of a highly responsive variable displacement pump and having a power-beyond port connected for supplying fluid to a secondary function control valve. The secondary function control valve has a power-beyond port connected to a displacement controller which is responsive to the flow for increasing or decreasing the displacement of the pump respectively in response to decreases and increases in power-beyond flow from the secondary function control valve. Provided for nullifying signals which would otherwise effect changes in the displacement of the pump when functions controlled by either the primary or secondary function control valves encounter sudden, momentary load changes is a pair of identical lead compensators in the form of stepped pistons arranged with the small ends thereof respectively in fluid communication with the primary control valve power-beyond flow and with the pump output and having the large ends thereof connected to the pump displacement controller.


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