Abstract: The hydraulic forwarding of solids over long distances and/or differences in height is effected by means of tube-chamber distributor systems which operate as pressure locks on the booster principle, where use is made of pressure-measurement instruments, shut-off devices with limit switches and time switches. These control means effect the continual changeover between the filling of the particular tube chamber concerned with the slurry to be forwarded and the emptying of the same by the application of pressures with the forwarding liquid so that, on the one hand, the forwarding liquid which is present in the tube chamber is forced out by the slurry which is being filled into the tube chamber and, on the other hand, the introduction of the forwarding liquid into said tube chamber forces out the slurry contained in said tube chamber.

Abstract: For cooling of underground mine-shafts which extend over several levels at different depths and/or of the machinery installed therein, a tube-chamber feeder system which is operated for the hydraulic transport of solids is used. With this arrangement, the cooling liquid is supplied to the feeder system and to the high-pressure side of the tube chambers from above ground level through a high-pressure circulation of the cooling liquid and subsequently the cooling liquid from the tube chambers is forced through a low-pressure liquid circulation for transfer to the equipment requiring cooling.