This choke valve, during cold engine starting, starts fuel to flow through the main system prematurely.
在冷启动时，阻风门使燃油提早进入主供油装置。
High delivery lift and high backpressure required in fuel throttle valve test were obtained through higher rotation speed of the main pump.
利用长征系列发动机主泵作为动力源，提高其转速，解决了燃料节流阀试验要求的高扬程、高背压等技术难题。
Further opening the throttle valve activated the main fuel jet.
当节流阀进一步打开时，主喷口开始工作。
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