A resealable closure and valve assembly adapted to be coupled to a container to selectively control the dispensing of liquid from the container. The resealable closure and valve assembly includes a non-mechanically biased stop selectively engageable with a passageway to selectively seal the passageway from a dispensable product, such as a liquid contained within a container. In some embodiments, the stop is adapted to reseal the passageway by the force of weight applied to the stop by fluid in the container. In some embodiments, the stop is adapted to reseal the passageway via a suction force.