Abstract: Filter plates in an electro-filter are cleaned using nozzles which, during spraying, are displaced longitudinally with the side edges of the filter plates while at the same time being rotated. The nozzles are mounted in a plane slightly different from the plane of the filter plates to enable the spray jets to reach the furthermost areas of the plates when the nozzles are at the greatest angle of incidence during washing.

Abstract: An apparatus for cleaning the inside surfaces of a tank with a jet of fluid from a nozzle lowered into the interior of the tank. The nozzle is capable of being rotated around a first axis and also capable of being swivelled upward and downward in an oscillating movement around a second axis at right angles to the first axis in a predetermined manner. A drive mechanism for the nozzle includes a turbine driven by a stream of fluid with a drive connected to the turbine.

Abstract: A compact cleaning plant is provided which has great cleaning effect and is self-cleaning. The apparatus according to the invention has a conical stationary part (1) mounted on the inlet pipe for the cleaning liquid, and on which there is suspended a 90.degree. pipe bend (16), the end of which has a hub (11) with nozzles (12) mounted in a rotatable manner in relation to the pipe bend. In this housing, there is contained a turbine (23) which drives a planet gear (15, 27) for turning the pipe bend (16), while at the same time the hub (11) is turned by means of toothed rims (8, 13) enclosed within the housing (1, 16, 11). The housing is also provided with outlet openings (35) and outlet slots (36, 37) for that part of the liquid (39) which serves to lubricate and clean the bearings, said openings and slots being positioned and configured in such a manner that the diverted out-flowing liquid also sweeps all of the housing's external parts.