| 摘要 |
An indexing device for flow control includes a first cylinder having a plurality of slots disposed thereon along a path that changes rotational direction at least once before the path completes a circle around the first cylinder; and a second cylindrical member forming a concentric assembly with the first cylinder, such that an index pin disposed on the second cylindrical member is configured to move in the plurality of slots on the first cylinder when the first cylinder and the second cylindrical member move relative to each other.
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