| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing method for a seat ring for a valve and a valve element which have sufficient elasticity and high chemical resistance, and prevent deterioration even if stress is repeatedly applied. SOLUTION: A seat ring 15 of a ball valve 10 is configured by a composite member equipped with a ring shaped elastomer cured material 151 and a fluorocarbon resin seat 152 laminated on a face side which is brought into contact with a fluid of the elastomer cured material 151. When manufacturing the seat ring 15 by the composite member, after reforming at least one face of the resin seat ring by discharge treatment under a prescribed gaseous atmosphere, a joining reinforcing agent is coated onto the deformed face. Subsequently, unvulcanized elastomer composition containing a vulcanized agent is heated and pressurized in a mold under the state brought into contact with the joining reinforcing agent coated face of the resin seat. By so doing, the resin seat and the elastomer cured material are joined and integrated to form the seat ring 15. COPYRIGHT: (C)2004,JPO&NCIPI
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