| 摘要 |
A device for controlling the rate of flow of a liquid in a flexible tube comprising two opposed surfaces between which the tube is received in use wherein the surfaces are elongated in the direction of flow of the liquid in the tube and are either parallel to one another or arranged so that in use the included angle does not exceed 40° DEG, and means for varying the distance between the surfaces so as to compress the tube between them by the desired amount.
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