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Close the purge valve and the zone valve.
关闭排气阀和区域阀门。
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Open the purge valve until the water flows clear and free of bubbles.
打开排气阀,直到水流清澈没有气泡。
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Open the purge valve until the water flows clear and free of bubbles.
打开排气阀,直到水流清澈没有气泡。
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