| 摘要 |
PURPOSE:To stop the flow of fluid easily by providing two drip type projections at the opposite positions on the innercircumferential face of flexible tube while making the tube flat to be sandwitched by the tube wall at the opposite projections. CONSTITUTION:Two drip type projections 2 are formed at the opposite positions on the innercircumferential face of flexible tube 1. A pressboard 10 and a pressure receiving board 7 are fixed to the upper and lower sections on the outercircumference of said tube 1. Consequently, when pressing the pressboard 10 toward the pressure receiving board 7, the tube is flattened to sandwitch the projections 2 thus to choke the flow path. When forming curved faces of similar shape with the sideface of the drip type projection at the flexible tube 1 side of said boards 10, 7, the flexible tube 1 is protected from damage.
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