| 摘要 |
Butterfly valve for ducts of hydroelectric power stations, with a web in said duct, extending transversely of said duct and being rigidly secured to said duct, and a flap pivotably mounted on said web; a drive mechanism comprising a servo-motor and first connecting means between said flap and said servomotor and second connecting means between said servo-motor and said web; said connecting means being arranged in a plane crossing said duct and being perpendicular to the pivoting axis of said flap.
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