double non-return valve的用法和樣例：
例句
- DOUBLE CHECK VALVE ASSEMBLY For Low Hazard Cross-connections and continuous pressure applications.
雙止回閥總成用于低危險交叉連接和持續壓力應用場(chǎng)合。 - A Double Check Detector Assembly shall be installed on fire protection systems when connected to a potable water supply.
當消防系統連接到飲用水供應系統時(shí)，應該安裝一個(gè)雙止回閥總成。
