| 摘要 |
A method and device for preventing unintended liquid flow from drinking containers are achieved by means of securing an inner tube (29) provided with a bellows (4) within an outer tube (1) and terminating one end of the inner tube (29) as a valve (70, 70'), whereby the suction force from the user provides a pressure difference across the bellows (4), causing the bellows (4) to move the valve (70, 70') with sufficient force to open. When the suction force ceases, the valve (70, 70') closes, and it remains closed, even when the liquid in the drinking container (61) is pressurized with pressure (P3).
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