Abstract: The invention relates to a one-piece plastic cap, the lower part of which, which can be attached to a container opening, is provided with a top wall in which a passage opening is provided, the lower side of which is joined via a dip tube to the container. The top wall is, furthermore, provided with a hole diaphragm which, in the closed position of the upper part, is closed by a sealing spike protruding from its lower side and, in the open position of the upper part, interacts with a valve spike projecting from its lower side which is dimensioned shorter relative to the sealing spike so that, when pressure is exerted on the container, the ventilation valve is closed. A pre-tensioning device of the upper part interacts with the lower part so that, in the closed position of the upper part, a discharge channel in the upper part is pressed with elastic pre-tension sealingly against the top wall and, in the open position of the upper part, sealingly against the edge of the passage opening.

Abstract: A biased swivel closure is provided for a container and includes a cap cover which is pivotably mounted to a closure cap for pivoting between a closed position sealing a discharge nozzle and an open position. The cap cover is normally biased to the closed position by a pretensioning device which is connected between the cap cover and the closure cap. The pretensioning device includes an inverted V-shaped leaf spring having first and second legs which are spread outwardly in an arc shape in the untensioned state when the cap cover is removed from its mounting in the closure cap. When the cover is pivotably mounted in the closure cap and oriented obliquely downwardly and generally in the same plane and parallel to one another with the root connection of the two legs resting on a portion of the closure cap.

Abstract: A closure device for a container is described consisting of a cap for a container and a cap lid which is pivotably mounted on the cap. The cap lid has an encircling circumferential border which projects downwardly from the upper surface of the lid. The border is a curved spherical surface segment and the cap defines a cup-shaped recess which is complementary in shape to facilitate sealing. The center of curvature of the spherical surface segment is located on the pivot axis of the cap lid. A pair of supporting plates are formed on a base portion of the cap and are guided in the pivot plane of the cap lid by parallel guide ribs so that the cap is non-rotatably mounted and pivotably mounted reliably in the recess and is sealed in every operating position relative to the container cap.