回流装置 meaning in Chinese

refluence
reflux unit

Reduced pressure detector assembly backflow preventer
减压检测器组合防回流装置
Double check detector assembly backflow preventor
双重检验检测器组合防回流装置
Performance requirements for hose connection backflow preventers
软管连接防回流装置的性能要求
Dual check valve type backflow preventers
双重止回阀型防回流装置
Laboratory faucet backflow preventer
实验室旋塞防回流装置

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