| 摘要 |
A vented closure apparatus for a container having an open ended neck, including a cap having a top wall and a generally tubular sidewall depending therefrom and adopted for attachment to the neck of a container. The cap further has an aperture through which liquid may flow from a container onto which the cap is secured. The closure further includes a flow control insert insertable into the cap and operative to control flow through the aperture, the insert and cap being of respective sizes and shapes to define a generally closed chamber therebetween. The cap has a gas passage hole in communication with the top of the chamber and the insert has a hole in communication with the bottom of the chamber. A seal divides the chamber into an upper gas discharge chamber and a lower liquid containment chamber, the seal being operative to allow air to pass therethrough in response to a differential pressure existing between the atmosphere within and without a container equipped with the closure, but operative to prevent liquid flow therethrough.
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