Cap for containers of carbonated products

A cap for closing and opening a container of liquids, in particular beverages, defining a longitudinal axis (X), comprising:

• a supporting element, adapted to be fixed to the container, having
• a first base portion, coaxial to the longitudinal axis (X), with a fixing device adapted to engage an aperture of the container;
• a first intermediate portion, coaxial to the longitudinal axis (X), on an inner wall of which there is a plurality of first grooves inclined by a first angle with respect to a base plane orthogonal to the longitudinal axis (X);
• a first vertex portion, coaxial to the longitudinal axis (X)
• a first annular sealing surface, coaxial to the longitudinal axis (X), arranged at a junction between the first intermediate portion and the first vertex portion;
• a pivotal element, inserted in the supporting element and configured to pivot by a predetermined arc of a circle smaller than 180°, having
• a second base portion, coaxial to the longitudinal axis (X), on an outer wall of which first, passages for a passage of liquid and a plurality of first guiding teeth inclined by the first angle are formed, which form a first helical kinematic pair with the plurality of first grooves;
• a second intermediate portion, coaxial to the longitudinal axis (X), on an outer wall of which second passages for the passage of liquid are formed;
• a second vertex portion coaxial to the longitudinal axis (X);
• a second annular sealing surface, of shape complementary to that of the first annular sealing surface, arranged at a joint between the second base portion and the second intermediate portion, configured to form contact with said first annular sealing surface so as to open and close the container in fluid-tight manner during an use of, the cap.