打开排气阀，直到水流清澈没有气泡。
Open the purge valve until the water flows clear and free of bubbles.
在打开的排气阀，流体流动的方向，从更高的压力，降低压力。
In an open valve, fluid flows in a direction from higher pressure to lower pressure.
在打开的排气阀，流体流动的方向，从更高的压力，降低压力。
In an open valve, fluid flows in a direction from higher pressure to lower pressure.
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