转动调节螺杆，改变活门开启的高度，从而调节高压气体的通过量并达到所需的压力值。
Turning adjustment screw to change the height of the trap door open in order to adjust the volume of high-pressure gas through the pressure to achieve the required value.
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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