FIELD: devices used in beverage packages equipped with drinking straw.
SUBSTANCE: method involves fixing inner pipe 29 equipped with bellows member 4 within outer pipe 1, with one end of inner pipe terminating in valve 70. Suction force created by user provides pressure difference on bellows member 4 with the result that bellows member 4 moves valve 70 with force sufficient for opening thereof. In the absence of suction force, valve 70 is closed and remains closed even if liquid within beverage container is under pressure P3. Such construction prevents liquid from flowing or from being forced out of beverage container until user creates suction force again.
EFFECT: increased efficiency in preventing flowing of liquid from container.
15 cl, 24 dwg
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