| 摘要 |
PURPOSE: In a flange surface using a liquid phase gasket and an O-ring, a sealing performance is carried out improving sealing function. CONSTITUTION: An O-ring(30) is composed of a main body(32) having a sealing function, and a preventing portion(36) to block a liquid phase gasket while assembling a flange surface. The preventing portion of an arc shape is connected to a connecting portion in outer side of the main body, and has a certain interval with the main body.
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