Support pipe for concrete pump with pivoting valve

Sliding device for a pump with two conveyance cylinders operating in counter-stroke for conveyance of viscous materials, which materials are supplied to the pump from a material feeding bin having at least a front wall, a back wall, and a floor, said conveyance cylinders each having one opening in communication with said material feeding bin through said material feeding bin back wall, said sliding device including a C-shape curved pivot pipe, an extension pipe, and a discharge conduit,

• the pivot pipe having an upper end and a lower end, said lower end extending into the material feeding bin and said upper end being fixedly connected to the extension pipe,
• the extension pipe projecting over the back wall of the material feeding bin essentially parallel to the conveyance cylinders, having a first end and a second end, the first end fixedly connected to the pivot pipe, the second end connected to the discharge conduit via a pipe rotating connection,
• the pivot pipe connected for pivoting via a reversing mechanism in such a manner that the lower end of the pivot pipe is caused to connect alternatively outside the openings of the conveyance cylinders which are connected to the back wall of the material supply bin,
• and further including a support pipe which coaxially encompases the extension pipe, is fixedly connected at the upper end of the pivot pipe, and extends along at least one part of the extension pipe, the support pipe being stayed upon at least one rotating support spaced apart from the back wall of the material feeding bin and being releasably connected to the extension pipe, wherein the extension pipe is releasably connected, via a flange external to the material feeding bin, with the pivot pipe and a reversing lever of the reversing mechanism, and wherein the support pipe is rigidly connected with the flange.