Abstract: The invention relates to a sliding device for two-cylinder pumps for liquids, especially designed for concrete pumps. The sliding device (20) has a pivot pipe (16) which is bent and has substantially a C-shape. The pivot pipe is fixedly connected, at its upper end, to an extension pipe (42) protruding over a back wall (24) of a material feeding bin and connected, at its end opposite the pivot pipe, to a discharge conduit through a pipe rotating connection. The pivot pipe is placed in such a way that it is able to pivot about the axis of the extension pipe so that its other end is connected alternatively to the openings of the discharge cylinder (10). In order to ensure reliable operation in spite of frictional wear in the extension pipe (42), the invention provides for a support pipe (84) which coaxially overlaps the extension pipe (42), is fixedly connected to the upper end of the pivot pipe and extends over least on one part of the extension pipe (42).

Abstract: A thick matter pump, especially a concrete pump, including a material feed container, two conveyor cylinders opening at the front into the inside of the material feed container, a swivelling pipe, one end of which alternately in pulses communicates with the frontal apertures in the conveying cylinder and the other end being connected to a conveyor pipe and with a closable cleaning aperture in the appropriate pipe wall arranged near the end of the conveyor pipe or in a section of the swivelling pipe outside the material feed container. A cleaning cartridge can be connected to the cleaning aperture having a compressed air and/or pressurized water connection while the feed pipe and/or the swivelling pipe can be closed on the conveyor cylinder side by means of a blocking system.