No. 17 actuates the pilot valve, the main engine begins to run on the starting air.
当单作用气缸17的杆促动引导阀，主机开始在启动空气的作用下运转。
The master starting air valve can be operated both manually and electrically.
主启动气门可以手动或电动的方式启动。
The master starting air valve can be operated both manually and electrically.
主启动气门可以手动或电动的方式启动。
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