Abstract: A hydraulic ram includes a water inlet conduit, a draining conduit with a main clapper valve and a bell or cup valve. The bell or cup valve communicates with the chamber through a plurality of individual clapper arranged parallel to one another. Each of the individual clapper valves block one passage orifice. The bell or cup valve has a water backflow outlet connection. The individual clapper valves include spheres of resilient material located adjacent seats arranged in a wall separating the chamber from the bell or cup valve. The wall includes separating barriers and a perforated back-up plate. The draining conduit is arranged vertically under the chamber. The main clapper defines a vertical axis extending into the chamber and is mounted slidably in a stationary bearing, while being pulled back constantly and elastically into a top open position of the main clapper valve. The main clapper valves also includes an element serving as a shock absorber for an end of a downstroke.

Abstract: The method for regulating the terminal voltage delivered by an independent alternating-current generator consists in measuring the voltage in at least one phase, in measuring and automatically adjusting the frequency with respect to a reference value by putting dissipative resistors in circuit, and in automatically varying the reference value of the frequency as a function of variations in voltage. The invention achieves stable voltage control which prevents harmful oscillations and is applicable in particular to asynchronous generators which are driven by a natural fluid.