Patent ID: 9188286
Filing Date: 2015-11-17
Classification: E02F,F15B,F17D,Y10T

Abstract:
1. Hydraulic system for actuating the hydraulic actuators of a working machine, the hydraulic system comprises: a high-pressure oil delivery; a low-pressure oil discharge; at least one first slide valve which comprises a first spool, which is axially sliding, and controls a first hydraulic actuator; a first control which can be directly actuated by an operator by means of a control lever and controls the position of the first spool of the first slide valve; and a first pressure compensator which is hydraulically connected to the first slide valve, has a main inlet, which can be connected to the delivery by means of the first slide valve, and a main outlet, which can be connected to the first hydraulic actuator by means of the first slide valve, and presents a frontal chamber which determines the control of the pressure compensator and is permanently connected to the main inlet; the hydraulic system comprising a first drainage line, which connects the frontal chamber of the first pressure compensator to the discharge and is provided with a drainage valve which is actuated in order to open or close the first drainage line the hydraulic system being characterised in that is comprises: a signal line which is connected to a rear chamber of the first pressure compensator; a second drainage line which connects a node of the signal line to the discharge; and a third safety slide valve comprising a third spool which is fixed to the first spool of the first slide valve, is axially sliding and is interposed along the second drainage line in order to close or open the second drainage line itself.