The pressure compensation valve in LUDV system is based on the proportional overflow principle. The maximum load pressure is transmitted to all pressure compensation valves as a proportional control signal. At the same time, the load sensing controller also controls the displacement of the hydraulic pump under the action of the maximum load pressure, so that the output pressure of the pump is a fixed value higher than the maximum load pressure, In this way, the pressure drop of all multi-channel valves is controlled at the same value. When the oil supply of the pump is insufficient, even if the speed of the actuator will drop, because the pressure drop of all valve ports is the same, the speed of each working mechanism will maintain a proportional relationship according to the opening area of the valve, so as to ensure the accuracy of the excavator action.
