Abstract: An energy recovery device including a central compartment in which a turbine is arranged and which is positioned between at least first and second compartments is described. Liquid flows between the compartments via side valve systems and a central throttling channel. One specific feature is that an adjustable stopper is arranged substantially at the throttling channel. The device may include a second turbine that controls head losses and makes it possible to feed the main turbine located above, in the vortex.

Abstract: An energy recovery device including a central compartment in which a turbine is arranged and which is positioned between at least first and second compartments is described. Liquid flows between the compartments via side valve systems and a central throttling channel. One specific feature is that an adjustable stopper is arranged substantially at the throttling channel. The device may include a second turbine that controls head losses and makes it possible to feed the main turbine located above, in the vortex.

Abstract: A device for recovering energy from a moving fluid includes at least one first turbine and at least one second turbine with each mounted between a first guiding element and a second guiding element and with the guiding elements being shifted in relation to one another in a first direction that is perpendicular to the direction of flow of the fluid, and with each of the guiding elements being generally streamlined in shape. The second turbine is shifted in relation to the first turbine in a second horizontal direction that is parallel to the direction of flow, and in the first direction such that the first or the second guiding element of the first turbine is positioned in the first direction between the two guiding elements of the second turbine.