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 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。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
TK - DL可以检测压力真空断路阀，减压防回流阀或双止回阀总成。
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