| 摘要 |
A waterbed draining system utilizes a vacuum relief valve operatively associated with a waterbed mattress bladder, or alternatively with the drain hose or water pump, to automatically provide air flow into the bladder upon the vacuum pressure within the bladder exceeding a predetermined level. The vacuum relief valve automatically bleeds air back into the bladder as needed to effect more complete drainage than was heretofore possible with conventional systems and without any need for operator assistance.
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