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。
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。
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