回流阀

reflux valve的用法和样例：

例句

A check valve may be required ahead of the backflow preventer.此时在防回流阀前面可能需要安装一个止回阀。
Here the air and water discharged from the return valve to the back entrance of the impeller.在这里空气排出而水又从回流阀返回到叶轮入口。

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