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.