double check valve

• 双止回阀,双单向阀

double check valve的用法和样例：

例句

1. 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。
2. A Double Check Detector Assembly shall be installed on fire protection systems when connected to a potable water supply.
   当消防系统连接到饮用水供应系统时，应该安装一个双止回阀总成。