A double check valve assembly shall be installed at each noted location.

双止回阀总成应该安装在每个指定的位置.

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There shall be no brass or bronze parts used within the check valve assembly.

在止回阀总成内部不应该采用黄铜或青铜部件.

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Series 719 Double Check Valve Assembly shall be installed at each noted location.

系列719双止回阀总成应该安装在每个标注的位置上.

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