Actuation is often desired for process automation, precision timing, and remote operation not possible with manual valves alone.

执行机构经常用于实现紧靠手动阀门无法实现的工艺过程的自动化，准确定时，以及远程操作。

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Way of actuation: manual, gear, electric, fluid and pneumatic etc.

驱动方式有手动，电动，液动，气动和齿轮传动等。

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