| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve body structure for a valve device and its manufacturing method, capable of integrating an inner machine part which is a metallic part and a resin valve body by a simple and inexpensive process, by using ultrasonic welding of mutual resins. SOLUTION: A valve seat member 5 is constituted by forming a resin layer 31 in advance by insert molding on the outside of a metallic annular valve seat 30 for providing an annular valve seat 5a. The resin layer 31 is desirably made of the same resin as the valve body 2. While applying ultrasonic vibration generated by an ultrasonic hone to the valve seat 30, the valve seat member 5 is pushed in a pipe connecting part 3 of the valve body 2, so that a resin part dimensionally overlapping with the resin layer 31 and the valve body 2 is melted by frictional heat and is integrated in cooling. COPYRIGHT: (C)2009,JPO&INPIT
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