Beverage dispenser comprising: - at least one container for storing soluble beverage powder, said container comprising:. a tank,. a discharge port at the outlet of the tank,. a dosing device configured for displacing a dose of soluble beverage powder to the discharge port - at least one beverage preparation unit operatively linked to the container for preparing a beverage from the stored soluble beverage powder, wherein the discharge port of the container comprises: - an internal delivery tube comprising a hollowing-out in its bottom part and closed at its end (221 a) next to the hollowing-out, - an external movable cover covering at least a part of the internal delivery tube and comprising a hollowing-out in its bottom part, said external movable cover being movable according to a translation movement between:. a dosing position in which both hollowing-outs (222, 224) of the internal delivery tube and of the external movable cover overlap each other, and. a rest position in which the surface of the external movable cover overlaps and closes the hollowing-out of the delivery tube, wherein the dispenser comprises an actuator able to exert a force on the external movable cover so as to move it between the rest position and the dosing position, said actuator comprising two rods, and - each of said rod is configured for engaging at its one first end (41 a) a lateral side of the external movable cover, and - each of said rod is extending along the lateral side of the tank, and - each of said rod is configured for being engageable at its one second end (41 b) by a motorised actuator to create a translation movement of the rod. - at least one container for storing soluble beverage powder, said container comprising:. a tank,. a discharge port at the outlet of the tank,. a dosing device configured for displacing a dose of soluble beverage powder to the discharge port. a tank,. a discharge port at the outlet of the tank,. a dosing device configured for displacing a dose of soluble beverage powder to the discharge port - at least one beverage preparation unit operatively linked to the container for preparing a beverage from the stored soluble beverage powder, - an internal delivery tube comprising a hollowing-out in its bottom part and closed at its end (221 a) next to the hollowing-out, - an external movable cover covering at least a part of the internal delivery tube and comprising a hollowing-out in its bottom part, said external movable cover being movable according to a translation movement between:. a dosing position in which both hollowing-outs (222, 224) of the internal delivery tube and of the external movable cover overlap each other, and. a rest position in which the surface of the external movable cover overlaps and closes the hollowing-out of the delivery tube,. a dosing position in which both hollowing-outs (222, 224) of the internal delivery tube and of the external movable cover overlap each other, and. a rest position in which the surface of the external movable cover overlaps and closes the hollowing-out of the delivery tube, - each of said rod is configured for engaging at its one first end (41 a) a lateral side of the external movable cover, and - each of said rod is extending along the lateral side of the tank, and - each of said rod is configured for being engageable at its one second end (41 b) by a motorised actuator to create a translation movement of the rod.