Demand compensated hydraulic system with pilot line dither

F - Mech Eng,Light,Heat,Weapons – 15 – B

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F15B 11/16 (2006.01) F16H 61/46 (2006.01)

Patent

CA 1049890

DEMAND COMPENSATED HYDRAULIC SYSTEM WITH PILOT LINE DITHER Abstract of the Disclosure A demand compensated hydraulic system includes a pump re- sponsive to a pressurized fluid in a demand feedback pilot line. The pilot line is connected to sense fluid demand between a hy- draulic motor and an associated control valve which is closed by servo feedback from the motor. A dither is connected to the pilot line to continuously oscillate the pressurized fluid in the pilot line to prevent the occurrence of a situation wherein the flow across the control valve is sufficient to prevent the pump from going to a stand-by condition while being insufficient to operate the motor to close the valve to thereby cause the pump to go into the stand-by condition.

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