| 摘要 |
A sleeve valve for pipelines has a fixed sleeve with inlet end open and outlet end closed, and openings in its side wall. A movable sleeve open at both ends is slidable in the fixed sleeve to open and close the openings. The improvement is that the inner sleeve also has openings in its side wall, and one or more ring-shaped partition plates are disposed at substantially equal intervals between the outer wall of the movable sleeve, and the inner wall of the fixed sleeve.
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