(57) In a pumping device (1) a first piston pump (4) and a second piston pump (8), having
respectively a first suction/delivery mouth (6) and a second suction/delivery mouth
(10) both communicating with the inside of a container (2) suitable for containing
a material to be pumped, act in phase with one another so that, when one performs
the compression phase, the other one performs the suction phase. A connection duct
(13) provided with an inlet aperture (14) for the material pressed by the said piston
pumps (4) and (8) is able to rotate about an axis of rotation (x-x) with the possibility
of assuming selectively at least a first position and a second position in which the
inlet aperture (14) is sealingly connected to the first suction/delivery mouth (6)
and, respectively, to the second suction/delivery mouth (10). The pumping device (1)
is used in particular on building sites for the purpose of conveying concrete.
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