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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DOUBLE CHECK VALVE ASSEMBLY For Low Hazard Cross-connections and continuous pressure applications.

双止回阀总成用于低危险交叉连接和持续压力应用场合。

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Double Check Valve Assembly shall be installed at referenced cross-connections to prevent the backflow of polluted water into the potable water supply.

在相关的交叉连接处应该安装一个双止回阀总成，以防止受到污染的水回流到饮用水系统中。

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