电源开关用于控制仪表箱电源的通断和正常停机操作。
Power switch for controlling power supply meter box-off and normal shutdown operation.
应用：用于指示电路的通断状态，机壳或外壳的正面操作或操作台上可以见信号指示。
Application: Used to indicate the "on" or "Off" position of circuit breaker, the signals can be seen on the case or its front or on the operating stage.
盘式活门，(老式叫法：蝶形活门)，利用作动简进行操作，安装在管道上的旋转装置。用来控制管道的通断。
DISK VALVE (OBSOLETE TERM - BUTTERFLY VALVE), an actuator-operated, rotating device in a duct for closing and opening the duct passage.
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