PACKAGE, LID AND VENT FOR PRESSURE EQUALIZATION

摘要

A package (15), lid assembly (20), and a vent device (24) are provided for decreasing the difference between the internal pressure within a package (15) and the external ambient air pressure. The vent device (24) is provided for mounting to the wall (26) of a package (15) or other enclosure wherein the wall (26) has an aperture (28) in which the vent device (24) is disposed. The vent device (24) includes a tubular portion (50) having a passage (52) extending therethrough. A valve (80) is disposed within the tubular portion (50) across the passage. The valve (80) includes a sleeve (117) and an occlusion member (82) which has at least two slits (84) extending there through. The slits (84) are closed when there is no pressure differential across the occlusion member (82). The slits (84) open when exposed to a predetermined pressure difference between (1) the ambient atmosphere outside the package (15) or other enclosure, and (2) the gases inside the package (15) or other enclosure.