| 摘要 |
A Sleeve Valve for regulating the water level in ponds, lagoons and other wetlands which includes an outer tubular section of plastic pipe with a plurality of vertically spaced openings and an inner tubular section of plastic pipe that is disposed telescopically within, and rotatable relative to, the outer tubular pipe. This inner tubular pipe includes a plurality of vertically spaced openings that are positionally staggered about a circumference and arranged for selective alignment with one of the openings in the outer pipe. Each of the openings in the outer pipe are sealed against the outer wall of the inner pipe until rotation of the inner pipe causes alignment of a selected opening in the outer pipe with a corresponding opening in the inner pipe, thereby allowing water to pass only through such corresponding aligned openings. The water level is regulated by selecting and aligning corresponding openings in the outer and inner pipes at the water level desired. Water passing through the aligned openings of the inner and outer pipes pass by gravitational flow to a remote location through a discharge conduit that is connected to the lower end of the outer pipe.
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