... 三、止回阀(Check valve) 四、双止回阀(Double check valve) 五、减压回流防止阀(Reduced pressure zone backflow preventer) ...
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... double nipples 双头螺纹接管 double non-return valve 双止回阀 double nozzle 双头喷嘴 ...
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... Duner flush valve 达式水阀 duplex check valve 双止回阀 duplex release valve 复式缓解阀 ...
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... 双止回阀, 双单向阀 double check valve 双止回阀, 双回流阀 double return valve 双掷开关，双向开关 DTS; double-throw switch ...
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双扇止回阀 reed valve
双向旋启式止回阀 backflow gate
双板的止回阀 PROQUIP
双重止回阀 double check valve
双板对夹式止回阀 dual plate wafer type check valve
管路用双卡套式止回阀 Double one-way valve for pipe
对夹旋启式双瓣止回阀 ZRD
系列719双止回阀总成应该安装在每个标注的位置上。
Series 719 Double Check Valve Assembly shall be installed at each noted location.
这种双止回阀应该是美国瓦茨调节阀公司的系列CU7。
The dual check shall be Watts Regulator Company's Series CU7.
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。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
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