| 摘要 |
A pendulum gate valve incorporates an improved power transmission device for transmitting the movement of a pivot arm of the valve to a valve disk that selectively closes the valve. The power transmission device has a supporting plate and a valve disk support that is fixed to a tip end of the pivot arm and movable relative to the valve disk. First and second facing roller guide grooves, formed on the valve disk and on the valve disk support, respectively, extend obliquely downwardly so as to be separated from the valve disk. Third and fourth facing roller guide grooves, formed on the valve disk support and the supporting plate, respectively, extend obliquely downwardly so as to approach the valve disk. A first roller engages the first and second roller guide grooves, and a second roller engages the third and fourth roller guide grooves.
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