Centrifuges; machines and installations for draining, clarifying, separating, classifying and/or sorting, in particular for draining, clarifying, separating, classifying and/or sorting of mixtures in multiple phases, including solid-liquid mixtures, liquid-liquid mixtures, solid-solid mixtures, solid-solid-liquid mixtures, solid-liquid-liquid mixtures; machines, namely centrifuges, solid-bowl screw centrifuges, machines for decanting liquids, disc centrifuges, separators, belt presses; machin...