| 摘要 |
Profiles of surfaces of bodies subject to relative motion in a fluid are designed on the ground of particular relationships between the elements involved when the optimum performance in the interaction between body and fluid is desired. A profile is disclosed for a rotary valve which coaxially connects two sections of a water pipeline, for closing, opening and regulating the water flow from upstream to downstream, the inner surface of suitable passageways which are evenly distributed about the axis of the rotary valve being suitably shaped.
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