氧气通过减压调节器和关断活门流向氧气面罩。
Oxygen flows through the pressure reducing regulator and shut off valve to the masks.
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。
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。
Pressure regulating AND SHUTOFF valve PRSOV, a valve in the pneumatic system for regulating bleed air pressure from the engine to the pneumatic manifold.
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