... air-to-air total heat exchanger 全热换热器 air-to-close valve 失气开启阀；通气关闭阀 air-to-cloth ratio 气布比 ...
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air fails valve to close 气开控制阀
The amount of air pressure required to close the valve depends upon the line pressure of the pipeline.
关闭阀门所要求的气压值依赖于管道内的管道压力。
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。
Air solenoid valves are used to open and close the valve.
采用航空电磁阀控制阀门开闭。
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