If the screen pack or pipe has the damage can ravel flowmeter check, remove impurities.

若过滤网或管道有损坏可拆开流量计检查，去除杂质。

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Clean screen pack, install a air filter at the entrance to the end;

清理过滤网，在入口端装一个空气滤清器；

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Clean screen pack, install a air filter at the entrance to the end;

清理过滤网，在入口端装一个空气滤清器；

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