Patent ID: 6223956
Filing Date: 2001-05-01
Classification: B65D,Y10T

Abstract:
A self-closing valve assembly for installation in a dispensing opening of a container or in a seal cap, including a first closure element having a wall portion of resilient material incorporating a passage-opening, said wall portion being resiliently deformable from a closed position into an open position under the influence of a first differential pressure force resulting from pressures acting on the opposite surfaces of said wall portion, and a second closure element for sealing the passage-opening when the first closure element is in its closed position, wherein said second closure element can be brought out of its sealing relationship with the passage-opening in the first closure element under the influence of a second pressure force resulting from pressures acting on its opposite surfaces, said second differential pressure force being directed oppositely to said first differential pressure force, and wherein the wall portions of the first and second closure elements have domed configurations directed towards each other in a balanced state of the loads acting thereon.