| 摘要 |
PROBLEM TO BE SOLVED: To provide a valve mechanism in which an annular valve seat made of corrosion- and erosion-resistant alloy is applicable to a valve seat formed in a place having a narrow opening, and its manufacturing method. SOLUTION: A part in an annular valve seat 6 is cut to be deformed and inserted into a valve casing 2. After that, the deformed annular valve seat 6 is made to be restored so as to carry out fixation onto the valve casing 2 and connection between cut portions. Even if an opening is narrow, the deformation of an annular seat 1 allows insertion of the annular valve seat 6 made of corrosion- and erosion-resistant alloy can be mounted inside. Even in this type of valve mechanism 1, therefore, the corrosion- and erosion-resistance of the valve seat 5 can be improved. COPYRIGHT: (C)2006,JPO&NCIPI
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