| 摘要 |
PURPOSE:To open and close a valve having a large diameter and a large stroke by a relatively small electromagnetic coil by using a pair of arms which are pivotally supported and operated by electromagnetic coils and returned by springs. CONSTITUTION:The engagement parts 12 and 22 at the top edge of the arms 10 and 20 which are operated by electromagnetic coils 14 and 24 and returned by spring 15 and 25 are allowed to contact with a rod 1 installed onto a valve body 7. Each of the engagement parts 12 and 22 of the arms 10 and 20 possesses the engagement action in one direction. Further, the engagement part 12 of the first arm 10 is shifted to the position free from the engagement at the stroke edge. Further, the engagement part 22 of the second arm 20 shifts to the position where the rod 1 is not urged by the urging of the related electromagnetic coil 24. With such constitution, a valve having a large diameter and a large stroke can be opened and closed by a relatively small electromagnetic coil.
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