The throttle plate moves toward the closed position as rated speed is reached. 當達到發動機額定轉速時，節流板趨於關閉位置。
A butterfly isolation valve cannot be installed directly to the valve inlet flange, as the disc will contact the orifice plate. 蝶閥隔離閥不能夠直接安裝在閥門進口法蘭上，因為其閥瓣將會接觸到節流板。
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