Patent ID: 8079215

Claim:
A system for uncoupling hydraulic plants comprising: a bidirectional pump; a hydraulic actuator, wherein the pump and the actuator are connected by a device that, only on a basis of measures on circulating fluid between the pump and the actuator, controls a motion of the actuator, causing the actuator to follow a movement of the pump; wherein the actuator and the pump are connected with a symmetrical hydraulic circuit, the symmetrical hydraulic circuit comprising a first branch and a second branch, wherein the first branch comprises, a first controlled flow valve driven according to a pressure measured at a measure point in the second branch, a second controlled flow valve driven according to the pressure measured at the measure point in the second branch, and a measure point in the first branch, the measure point in the first branch measuring the pressure at an outflow from a first door of the pump, and wherein the second branch comprises, a third controlled flow valve driven according to a pressure measured at the measure point in the first branch, a fourth controlled flow valve driven according to the pressure measured at the measure point in the first branch, and the measure point in the second branch, the measure point in the second branch measuring the pressure of an outflow from a second door of the pump, the first door and the second door regulating inflow and outflow from the pump, the first and the second controlled flow valves being connected to a tank; a first cursor controlling flow of the first controlled flow valve and a second cursor controlling flow of the third controlled flow valve; a first and a second pistons providing the measure points in the first and respectively in the second branches; and a first and a second springs coupled to the first and the second pistons, the first and the second springs causing the first and the second pistons to move proportionally with a difference between the pressures in opposing chambers of the actuator and the pressures in the first and the second branches.