| 摘要 |
The present invention is made to prevent stress concentration on or around a boundary between a valve element body and a web portion of a diaphragm even in controlling supply of high-pressure fluid, thereby improving durability of the diaphragm. A diaphragm valve 1 of the present invention comprises a diaphragm valve element 20 including a valve element body 21 movable into contact with a valve seat 13 , a web portion 22 extending outward from the valve element body 21 , and a fixed portion 23 formed at an outer peripheral edge of the web portion 22 . The web portion 22 includes a vertical portion 22 a vertically formed continuous with the valve element body 21 , a horizontal portion 22 c horizontally formed continuous with the fixed portion 23 , and a connecting portion 22 b of a circular arc shape (an upward protruding shape) in section to connect the vertical portion 22 a with the horizontal portion 22 c, thereby holding the vertical portion 22 a in constant contact with an outer surface of a backup 40.
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