A system for controlling the movement of a ring gate, of a hydraulic machine, said system comprising a plurality of groups actuation cylinders, each group comprising at least: - a first actuation cylinder for controlling the movement of said ring-gate, said actuation cylinder comprising a body forming a first chamber provided with a first duct and a second chamber provided with a second duct which are designed to receive an actuating fluid through said first duct and said second duct, said chambers being separated from one another by a piston connected to an actuating rod and able to move in said body in a first direction in which the volume of the second chamber increases while the volume of the first chamber decreases, and in a second direction in which the volume of the second chamber decreases while the volume of the first chamber increases, said piston being provided with a rod connected in said second chamber to an area of the piston turned toward said second chamber, said area having a surface less than an area of the piston turned toward the first chamber; - a second actuation cylinder comprising a body forming a first chamber and a second chamber which are designed to receive an actuating fluid, said chambers being separated from one another by a piston connected to an actuating rod and able to move said body in a first direction in which the volume of the second chamber increases while the volume of the first chamber decreases, and in a second direction in which the volume of the second chamber decreases while the volume of the first chamber increases; - a hydraulic synchronization member connecting said first chamber of said first actuation cylinder and said second chamber said second actuation cylinder - a first actuation cylinder for controlling the movement of said ring-gate, said actuation cylinder comprising a body forming a first chamber provided with a first duct and a second chamber provided with a second duct which are designed to receive an actuating fluid through said first duct and said second duct, said chambers being separated from one another by a piston connected to an actuating rod and able to move in said body in a first direction in which the volume of the second chamber increases while the volume of the first chamber decreases, and in a second direction in which the volume of the second chamber decreases while the volume of the first chamber increases, said piston being provided with a rod connected in said second chamber to an area of the piston turned toward said second chamber, said area having a surface less than an area of the piston turned toward the first chamber; - a second actuation cylinder comprising a body forming a first chamber and a second chamber which are designed to receive an actuating fluid, said chambers being separated from one another by a piston connected to an actuating rod and able to move said body in a first direction in which the volume of the second chamber increases while the volume of the first chamber decreases, and in a second direction in which the volume of the second chamber decreases while the volume of the first chamber increases; - a hydraulic synchronization member connecting said first chamber of said first actuation cylinder and said second chamber said second actuation cylinder