... double check system 双重监视系统，重复检测制 double check-valve assembly 双逆止阀装置 double-circuit 双[电]路，加倍电路，双回路 ...
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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。
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。
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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