Abstract: Hydraulic system for actuating the hydraulic actuators of a working machine, the hydraulic system has a delivery, a discharge, a drainage line, a signal line, a main slide valve which actuates a corresponding hydraulic actuator, a safety slide valve integral with the main slide valve and adapted for opening or closing the drainage line itself, and a pressure compensator presenting a frontal chamber connectable by way of the main slide valve to the delivery and a rear chamber connected to the signal line; the drainage line connecting a node of the signal line to the discharge.

Abstract: A pressure-compensating directional control valve, for actuating hydraulic actuators, comprising at least one modular valve body, with one through receptacle for a slidable shuttle, a driving fluid delivery port connected to a pump, a discharge fluid port, a first output opening and a second output opening, connected to the first and second chamber, of a hydraulic actuator, at least one bridge for selective communication, by way of the shuttle, of the delivery port with the first or second chambers of the actuator, for actuation thereof, a unidirectional hydrostat connected to the bridge to draw selectively a pressure signal of the load of the actuator, the signal for adjusting selectively the delivery pressure of the pump so as to keep substantially constant the pressure drop between the delivery port and the actuator in any load condition.