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。
2
Air tightness test and safety valve adjusting for mainair receiver (control air receiver, air horn receiver) on board.
主空气瓶(制空气瓶、笛空气瓶)船后气密试验和安全阀的调整。
3
Based on the inhouse structure of JZ-7 air brakes, the design scheme of distribution valves for passenger locomotives was proposed and the mainvalve of new distribution valves was developed.