| 摘要 |
An air-precluding flow-regulating device for maintaining a predetermined flow rate through a conduit from a site of higher to a site of lower elevation, comprising: a section of normally collapsed soft resilient tube forming at least a part of the conduit and having a length at least as great as the variation in back pressure expressed in head at the site of lower elevation, said tube being disposed to contain the ambient pressure level within its length.
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