Apparatus configured to provide both wet and dry blasting and method for operating such an apparatus

1. An apparatus for blasting comprising a blasting medium storage means and a distribution block for receiving a blasting medium, a pressure medium and a liquid medium, said distribution block having an outlet connectable with at least one distributing means, said apparatus configured and controlled to comprise:

a first operating mode wherein via the outlet of the distribution block the blasting medium alone, is distributed by the pressure medium;

a second operating mode wherein via the outlet of the distribution block the blasting medium with the liquid medium are distributed by the pressure medium; and

a third operating mode wherein via the outlet of the distribution block the pressure medium is distributed alone;

wherein the distribution block comprises a chamber downstream of a control valve and communicating with said control valve and wherein a first inlet for entry of the pressure medium and a second inlet for entry of the blasting medium are defined in the chamber;

wherein the distribution block comprises a coupling element rigidly connected with the chamber and provided with a third inlet for entry of the liquid medium within the distribution block and wherein the coupling element comprises a substantially tubular body that is provided on a lateral wall of the coupling element with the third inlet defining a liquid well ingress into the distribution block;

wherein the coupling element comprises a plurality of internal jets parallel to a direction of flow of the pressure medium and communicating with the liquid well ingress, to inject the liquid medium into the distribution block parallel and in the same direction to the flow of the pressure medium;

wherein the third operating mode is capable of being performed in passing from the

second operating mode to the first operating mode;

wherein the apparatus is configured to comprise a further operating mode wherein via the outlet of the distribution block the liquid medium alone, is distributed by the pressure medium;

wherein the blasting medium storage means is connected with the distribution block by the control valve.

2. The apparatus as claimed in claim 1 , wherein the first inlet is located upstream of the second inlet and the third inlet.

3. The apparatus as claimed in claim 2 , wherein the third inlet is located downstream of the first inlet and the second inlet.

4. The apparatus as claimed in claim 3 , wherein the apparatus comprises a compressor configured to provide the pressure medium within the distribution block.

5. The apparatus as claimed in claim 4 , further comprising an external compressor operably associated with the apparatus.

6. The apparatus as claimed in claim 5 , wherein the apparatus is configured so that, in the first operating mode, the blasting medium is mixed with the pressure medium within the distribution block and in the second operating mode, the blasting medium is mixed with the pressure medium and with the liquid medium within the distribution block.

7. The apparatus as claimed in claim 6 , wherein the apparatus further comprises a control panel provided with input means for selecting the operating mode of the apparatus itself.