Valve actuation utilizes a mechanical power device, an actuator, to operate a valve.
阀门执行机构是一种采用机械力的设备，一台执行机构操作一个阀门。
A light tap on a smooth surface or the proximity of a hand replaces physical actuation of a mechanical switch.
在光滑表面上轻轻一触，或者用手靠近一下，就能代替机械开关的物理传动。
A kind of electromagnetic actuation optical switch is designed based on the high performance of polyimide (PI) in mechanical character, insulation and heat-resistant.
利用聚酰亚胺(PI)优良的机械、绝缘、耐热等性能，设计出基于PI膜的磁控光开关。
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