Patent ID: 9003786
Filing Date: 2015-04-14
Classification: F15B

Abstract:
1. A hydraulic circuit to control the flow of pressurized fluid from a pump to a hydraulic actuator assembly comprising: a plurality of operational valves provided in a supply line of the pump; a pressure compensator connected between an operational valve and the hydraulic actuator assembly, adapted to feed fluid from the pump to the hydraulic actuator assembly, the pressure compensator having a first inlet and a second inlet, the first inlet connected to the supply line from the pump adapted to open the compensator by the fluid pressure, and the second inlet connected to a load sense line and a spring adapted to apply pressure in a direction to close the compensator; an external pump configured to apply pressure at the second inlet to close the compensator when the load sense line senses a predefined pressure value inside the compensator thereby limiting the pressure and the flow of the fluid; a control valve disposed between the external pump and the second inlet, configured to direct selective flow from the external pump to the second inlet; and a valve coupled to a first signal line in communication with a first chamber of the hydraulic actuator assembly, and a second signal line in communication with a second chamber of the hydraulic actuator assembly, wherein the valve is configured to communicate one of a pressure signal of the first and second signal line to the control valve, wherein the control valve is movable between positions based on the pressure signal.