| 摘要 |
The wall of an elastomer sleeve valve is provided with a lip-shaped internal sealing member at a median region of the wall; when the valve is closed, the sealing member forms two lips contacting each other along a substantially diametral plane to produce sealing, and contacted lips have arcuate ends joining them so that they produce the seal without causing undue stresses in the sleeve wall. In a preferred embodiment the lips contact each other when no hydraulic pressures are imposed on the sleeve in the rest state.
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