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High Efficiency and Low Consumption Engine for SANY Hydraulic Excavator
February 9, 2017
7:43 pm
jackthomas
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Forum Posts: 8
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December 12, 2016
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World-leading positive flow controlled hydraulic system
Sany Excavator adopts world-leading positive flow controlled hydraulic system. Advantage of the system is that the main pump’s displacement is directly proportional to the signal pressure from the pilot joystick. The controller determines the flow demand and variation trend of the actuator, and regulates the displacement, a real-time match of flow is achieved in the system, i.e. “What you get is what you need.”

A quick circuit is added to the arm oil cylinder circuit. When the arm oil cylinder is extended, the oil return circuit is cut off and hydraulic oil flows from the return circuit into the cylinder via a check valve. The hydraulic oil in arm cylinder rod end does not return the tank but goes directly to the cylinder head end. The excavator arm speed is increased.

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