The throttle plate moves toward the closed position as rated speed is reached. 当达到发动机额定转速时,节流板趋于关闭位置。
A butterfly isolation valve cannot be installed directly to the valve inlet flange, as the disc will contact the orifice plate. 蝶阀隔离阀不能够直接安装在阀门进口法兰上,因为其阀瓣将会接触到节流板。