This short-arc coupled with the low pendulum effect achieved by pivoting the disc through a point near its center of gravity assures rapid closure.

 
  • 繞軸旋轉的閥瓣的重力中心距軸心較短,因此這種短弧的鐘擺效應也比較小,從而確保能夠迅速關(guān)閉。
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