Patent ID: 7231764

Claim:
A replenishing and/or flushing device for a circuit including at least one hydraulic motor having a casing which defines an internal space in which a cylinder block of the motor is disposed, and two main ducts which are connected to a main pump and which constitute respectively a feed main duct and a discharge main duct for said hydraulic motor, the device comprising a replenishing valve connected to at least one of the main ducts and suitable for taking up an open configuration in which said valve establishes a link between said main duct to which said valve is connected and a pressure-free reservoir, and a closed configuration in which the valve prevents such a link from being established, the device further comprising means for causing said replenishing valve to go between the open and the closed configurations as a function of at least one control parameter representing a state of the circuit other than pressure in said main duct to which said replenishing valve is connected, the replenishing valve including a moving member mounted to move between a first position and a second position respectively corresponding to the closed configuration and to the open configuration of the replenishing valve, the device further comprising a control valve which is controlled as a function of said at least one control parameter to allow said moving member to move, said device further comprising an opening control chamber suitable for being connected to one of said main ducts via a first link duct so as to urge the moving member towards the second position thereof in which said main duct is connected to the pressure-free reservoir, and a closing control chamber suitable for being a pressurized enclosure in order to urge the moving member towards the first position thereof, and the control valve being controlled as a function of said at least one control parameter in order to connect said closing control chamber to the pressure-free reservoir or in order to isolate said chamber from said reservoir.