Patent ID: 7637102

Claim:
An open hydraulic circuit comprising a main pump suitable for delivering a fluid under pressure, a hydraulic motor, two main ducts for feeding and for discharging said motor, a feed selector suitable for connecting the main ducts respectively to the main pump and to a reservoir without extra pressure, and for isolating said ducts from said pump and from said reservoir for the purpose of braking the motor, and booster means for boosting the discharge main duct, a multifunction valve device comprising a multifunction selector that, when the pressure in one main duct is higher than the pressure in the other main duct, is suitable for connecting the main duct in which the pressure is higher to a first auxiliary duct on which a pressure limiter is disposed, and for connecting the main duct in which the pressure is lower to the booster means, and that, when the pressures in the main ducts are substantially mutually equal, is suitable for connecting said ducts together by connecting them to said first auxiliary duct.