Closing element

Closing unit for a throughflow opening of a beverage container, the closing unit comprising:

• a first closing element configured to be mounted or integrally formed on the beverage container, wherein the first closing element comprises a receiving part comprising a wall, the receiving part provided with a passage and to be arranged in or round the throughflow opening, the throughflow opening being a drinking or pouring opening of the beverage container;
• a second closing element comprising a closing part configured to be received by the receiving part and to be coupled releasably thereto for the purpose of closing or leaving clear the drinking or pouring opening;
• wherein the wall of the receiving part comprises a conical screw thread disposed on its surface,
• wherein the closing part of the second closing element comprises a substantially annular downward extending part with an external conical screw thread disposed on its outer surface,
• wherein the downward extending part of the second closing element comprises a hollow space defined therein such that when the second closing element is engaged with the first closing element, the hollow space is exposed to the volume of the beverage container,
• wherein the flexibility of the wall of the receiving part of the first closing element is lower than the flexibility of the downward extending part of the closing part of the second closing element such that when the second closing element is engaged with the first closing element, the downward extending part of the second closing element is configured to move in a radial direction against the wall of the first closing element due to the pressure inside of the beverage container, and
• wherein the conical screw threads disposed on the first and second closing elements are configured to be threadbly engaged with each other such that the conical screw threads of the second closing element are pressed increasingly more firmly against the conical screw threads of the first closing element in a radial direction relative to a longitudinal axis of the hollow space defined in the second closing element as the pressure inside the beverage container increases.