| 摘要 |
A self-venting dispensing closure for fluid-tight engagement with a squeeze bottle includes a cap containing a fluid opening, a flexible disc on the cap containing a fluid bore which defines together with such opening a single fluid passageway through the closure, the cap including an annular wall defining a valve seat lying upstream of the fluid opening in the direction of product flow through the passageway, the disc having an annular valve thereon in engagement with the valve seat in a closed position of the passageway, and the valve being shiftable along the annular wall to positions respectively upstream and downstream of the valve seat in response to sub-atmospheric and super-atmospheric pressures within the bottle. In these shifted positions, the valve opens respectively into bottle venting and dispensing positions. An overcap in engagement with the cap may be provided for closing the fluid passageway in a non-use and/or storage condition of the bottle.
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