Abstract: The reproducing system 9, 10, 42, 43 controls rotation of the rotor 30 of the electric motor 28 in order to provoke a variation in the leakage of the leakage relay 33 with a view to varying the position of the piston 2 of the jack 1. The stator 34 of the motor 28 is connected by a mechanical link 36 to the piston rod 2a of the jack 1. In the event of no-voltage, the brake 29 of the motor acts in order to connect the rotor 30 and the stator 34. The position of the rod 2a may then be varied by mechanically rotating the rotor-stator assembly 30-34 by a crank 41.

Abstract: A buffer device for the spiral housings of water turbines wherein the housing includes an extension located along the axis of the inlet conduit into the housing and wherein a hydraulic cylinder and piston assembly is disposed between the extension and a fixed support with a fluid conduit extending between the housing and the cavity of the hydraulic cylinder and piston assembly.

Abstract: This invention relates to a channel for supplying water to a vertical-axis Kaplan water turbine, wherein the vertical side walls thereof are oriented in convergent manner in order that, at turbine level, they join an end face of rounded form, of which the radius of curvature is slightly greater than the radius of the guide blades located above the turbine and the sleeve of the turbine shaft and/or an inclined fixed wall downstream of the turbine are provided, for preventing the development of suction eddies downstream of the sleeve of the turbine shaft.

Abstract: This invention relates to an improved device for reducing the lag of position of a non-linear copying system or subsidiary controller for a regulation loop, which comprises a comparator establishing the difference which enters in a multiplier from which emerges a signal sent into another comparator elaborating the difference between this signal and the difference between the frequency and the frequency reference, so that the output of this comparator is introduced into the integral action circuit of the subsidiary controller.