Abstract: An arrangement for hydraulically conveying solids of different specific weights in form of slurries has at least two elongated chambers the effective length of each of which may be varied in dependence on the specific weight of the solid component of the slurry supplied to the respective chambers. The slurry is cyclically fed into the chambers at substantially atmospheric pressure, and when the respective chamber is full pressurized hydraulic fluid, such as water, is utilized for discharging the slurry from the full chamber into a discharge conduit. The arrangement includes a device which measures the specific weight of the solid component and varies the length of the respective chamber in dependence on the measured specific weight. A plurality of valves controls the admission of the slurry and of the pressurized hydraulic fluid into the respective chambers so that, when one of the chambers is being filled with slurry, another chamber is discharged into the discharge conduit.

Abstract: An arrangement for hydraulically conveying solids especially coarse solids in form of a slurry includes three chambers which are cyclically and alternatingly filled with slurry at substantially the atmospheric pressure, and a pressurized hydraulic medium, such as water, discharges slurry from a full chamber into a discharge conduit. A plurality of supply conduits connects the sources of slurry and of the pressurized hydraulic medium with the chambers, and valves are interposed between the chambers and the conduits and operative for establishing and interrupting the communication of the conduits with the chambers. A control arrangement controls the operation of the valves as a function of time and of condition prevailing in the conduits and in the chambers so that continuous flow of slurry is obtained in the discharge conduit.