Lixit Product Support

What does the term "Vacuum-Valve" mean in water bottles?

Pet water bottles that feature a metal drinking tube with one or more metal ball bearings inside that tube, and do not feature the new top-filling design, are able to hold the water contents because a vacuum is formed in the sealed bottle. The metal ball (in multiple ball drinking tips this would be the lowest ball) allows a film of water to remain between the ball and the open end of the drinking tube. Since the movement of the exposed ball bearing breaks this seal, and the vacuum within the water bottle is released, the moving ball is in effect an opening and closing valve. The pet can access water as it flows down through the tube, for as long as it licks or nudges the ball, keeping the ball moving and the valve "open". When the pet leaves the water bottle and the ball settles into place at the end of the drinking tube, the film of water reforms and the valve "closes".

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