防倒流装置必须安装在调节阀的上游位置。
The backflow preventer must be installed upstream of the regulator.
最新的HP组件包内含优质的美国瓦茨部件，包括：新型AS-B青铜导气罩和B911S青铜进水阀和防倒流装置组合件。
The new HP package contains quality Watts components … including the new AS-B Bronze Air Scoop and the B911S Combination Bronze Fill Valve and Backflow Preventer.
这家新公司正在开发一项专利，通过向人体植入医疗装置来治疗胃酸倒流。
The company is developing a proprietary implantable medical device to treat acid reflux.
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