设置安全排气阀，在电机转速达到额定转速后，自动打开排气阀，保证起动器的安全可靠运行。
To guarantee running safety, it needs to set the safey exhausting valve, which will be opened automatically when reaching the rated speed.
备用排气阀应装配好放在安全的地方。
The spare exhaust valve should be assembled and kept in a safe place.
其他熟悉的例子包括对灶具燃气控制，小阀门安装在洗衣机和洗碗机，安全装置安装在热水系统，在汽车和发动机排气阀。
Other familiar examples include gas control valves on cookers, small valves fitted to washing machines and dishwashers, safety devices fitted to hot water systems, and valves in car engines.
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