| 摘要 |
PURPOSE:To minimize a non-calking margin of a slide seat ring, by deforming both walls of an annular grooved part having a tapered part, which forms a high upper end to each groove side before calking, and securing the slide seat ring to a valve seat. CONSTITUTION:A cylinder 16 provides in its inside a pair of valve seats 19, 20, and their respective seat surfaces 19a, 20a are parallelly fixed. While slide seat rings 26, 27, consisting of fluorine contained resin or the like, are adapted to the valve seats 19, 20, and the slide seat rings 26, 27 are housed in annular grooved parts 24a, 25a and secured by calking by deforming grooved part wall surfaces 24b, 24c, 25b, 25c. By this constitution, the slide seat ring, which enables its non-calking margin to be minimized and the calking along-surface length to be long increased, can use fluorine contained resin of low coefficient of friction.
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