| 摘要 |
A valve body of an on-off valve that minimizes the deviation of opening and closing characteristics of a valve member made of an elastic polymer material and provided in a valve body of the on-off valve due to expansion caused by the fluid handled thereby and that maintains the specified opening and closing operation. A base portion of the valve member made with an elastic polymer material is inserted in an attachment hole of a valve element of a valve body with space constituted by a small-diameter-hole portion left at the hole bottom. A constricted-diameter portion formed in a tip opening of the attachment hole is embedded in the valve member to secure the base portion of the valve member. Axial elongation due to swelling of the valve member is distributed as forward elongation and rearward elongation sandwiching the site of securing by the constricted-diameter portion, which minimizes the axial elongation of a tip portion with a valve face and curtails deviation from the settings for on-off timing.
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