Machines or installations for dewatering, clarifying, separating, classifying or sorting, particularly for dewatering, clarifying, separating, classifying or sorting mixtures of several phases such as solid-liquid mixtures, liquid-liquid mixtures, solid-solid mixtures, solid-solid-liquid mixtures, solid-liquid-liquid mixtures; machines, namely centrifuges, solid-bowl screw centrifuges, decanters, plate centrifuges, separators, band presses; centrifuges, solid-bowl screw centrifuges, decanters, plate centrifuges, separators, band presses as parts of a process line; machines or installations for dewatering, clarifying, separating, classifying or sorting of suspensions, particularly of suspensions with crystalline, granular or fibrous solid particles, or of sludges, particularly of sludges with amorphous solid particles, optionally with the addition of flocculating agents, liquid mixtures of two liquids of different density and a solid phase, optionally with the addition of emulsion splitting agents, two solids of different density with the addition of a carrier liquid; machines or installations for processing vegetable or animal fats or oils, beverages, chemical or pharmaceutical preparations, starch suspensions, proteins, sludge, industrial waste water, mineral oil, in particular the aforesaid goods for dewatering, clarifying, separating, classifying or sorting the aforesaid substances; mechanical apparatus for control, power generation or transmission, the aforesaid goods being in particular for aforesaid machines or installations; motors, other than for land vehicles; machine coupling and transmission components (except for land vehicles); agricultural implements, other than hand-operated; brewing machines; parts and accessories for the abovementioned products as far as included in this class.;