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1·Open vent needle valve and bleed air from hose. Then close vent valve.

开启排气针形阀，并从软管排放空气。然后关闭排气阀。

2·BLEED valve, a valve in the pneumatic system for air supply from the engine or auxiliary power unit to the pneumatic manifold.

引气活门，气源系统内，使来自发动机或辅助动力装置的空气进人气源支管的活门。

3·Relay valves convert a sustained air flow from a three-way pilot valve into a momentary pulse or bleed, which shifts a control valve and then closes.

延迟阀可调节从三通控制阀到瞬间脉冲或放气阀的空气流量，放气阀或瞬间脉冲改变控制阀，然后关闭。

4·Open needle valve b to bleed air and then close b and vent needle valve.

开启针形阀“B”排放空气，然后关闭“B”和排气针形阀。

5·Pressure regulating AND SHUTOFF valve PRSOV, a valve in the pneumatic system for regulating bleed air pressure from the engine to the pneumatic manifold.

压力调节和关断活门，气源系统中用以调节从发动机到气源总管的引气压力的活门。