| 摘要 |
A valve assembly includes, in one embodiment, a housing sealably attachable to a flexible container. The housing has a passageway and an upper stop disposed in the passageway. A plug includes an upper portion having a first peripherally-extending recess, and a lower portion defining a lower stop and at least one passageway extending past the lower portion. A seal is positionable in the recess. A compression spring is disposed between the stops to bias the plug downwardly to engage the seal with an upper opening of the passageway in the housing. The valve assembly has a self-closing position, and an open position upon a force being applied to the bottom portion of the plug so that the seal is disposed away from the upper opening to allow liquid to pass through the passageway in the housing and through the at least one passageway in the lower portion of the plug.
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