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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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Stand clear of the regulator and valve outlet, while opening the valve.
开启阀门时，躲开调整器和阀门排气口。
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Stand clear of the regulator and valve outlet, while opening the valve.
开启阀门时，躲开调整器和阀门排气口。
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