... 非金属泵 non-metal pump 非金属阀 non-metal valve 非均匀转动 nonuniform rotation ...
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non metal valve 非金属阀
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Electric or hydraulic flapper valves are usually equipped with non-metal sealing butterfly valve system to use.
电动或液动插板阀通常与非金属密封蝶阀配系运用。
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