Method and device for dissolving a solid concentrate

Method for putting in solution a concentrate in the powdery state contained in a receptacle provided with a single opening, the method comprising:

• causing a liquid coming from a source of liquid to enter the receptacle through the single opening, and then
• extracting an enriched solution of the concentrate in the liquid via the same single opening by suction,
• wherein the liquid is introduced into the receptacle by passing through a venturi tube comprising a convergent chamber, a vacuum tapping and a divergent chamber, the liquid entering the tube through the convergent chamber of the tube and leaving the tube through the vacuum tapping of the tube, before entering the receptacle,
• wherein the suction of the enriched solution is obtained by causing pressurised liquid to flow in the venturi tube between the convergent chamber and the divergent chamber,
• measuring the pressure between the vacuum tapping of the venturi tube and the receptacle by means of a pressure sensor, and
• controlling opening and closing of a valve according to the degree of filling the receptacle as a function of a pressure signal supplied by the pressure sensor to the valve via a control line, the valve being disposed in an extraction pipe a first end of which is connected to the divergent chamber of the venturi tube.