Pump for viscous materials, especially concrete

摘要

The pump is used especially to convey concrete, and has a swivelling tube (5) to connect at least two cylinders (1,2), to the inlet opening of a delivery pipe (7). The cylinders apply a delivery pressure, and have outlet openings which are arranged in a housing panel (11), against which an inlet end wall region of the tube makes a sliding seal. An inlet opening is arranged on a second casing panel (12), against which an outlet end wall region of the tube makes a sliding seal. At least one of the panels has a bias loading in the direction of the other panel. When the delivery pressure rises in the connecting tube, the end wall regions each remain in sealing contact with their associated panel.