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这将产生一个气隙以消除任何可能的回流。This would create an air gap to eliminate any possible backflow.

在安装回流阀之前系统应该进行冲刷。The system should be flushed before the backflow valve is installed.

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不建议在坑内或拱顶内安装防回流阀。Installing a backflow preventer in a pit or vault is not recommended.

此外，也防止防回流阀受到过大流量的破坏。Also, prevents damage to the backflow preventer due to excessive flow.

慢慢开启上游关闭阀，让防回流阀慢慢注满。Slowly open upstream shutoff and allow the backflow preventer to fill slowly.

可以在防回流阀上维修安全阀，或将其从防回流阀拆卸下来维修。The relief valve may be serviced while on or off the backflow preventer valve.

在防回流阀的下游不应该安装铜管。Copper tubing shall not be used on the downstream side of the backflow preventer.

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辅助管路应该由通过认证的防回流阀和水表构成。The auxiliary line shall consist of an approved backflow preventer and water meter.

在射流冲洗后进行返排，这时酸液从井中排出。Jet washing is followed by a backflow during which the acid is removed from the well.

如果需要特殊的减压防回流阀的认证，请与工厂联系。Contact the factory for specific approvals on the reduced pressure backflow preventer.

在安装排泄管线时，在型号909防回流阀上采用系列909气隙。When installing a drain line, use Series 909 air gaps on Model 909 backflow preventers.

双重排气系统能防止不必要的污染物回流至头盔内。Double Exhaust System helps to prevent backflow of unwanted contaminates into the helmet.

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由于存在通过系统的固定惯性气流，要设有防止回流装置。Backflow prevention should be present, along with a constant inert flow through the system.

带有测试旋塞的闸阀安装在防回流阀的进口一侧。The gate valve with the test cock is to mounted on the inlet side of the backflow preventer.

适用于用在临时性水应用的消防栓上的防回流阀的更新改造。Designed to retrofit backflow protection onto fire hydrants used for temporary water service.

本实用新型涉及一种医用防反流式食道支撑管。The utility model relates to a backflow prevention type esophagus supporting tube for medical use.

随着人民币改革的加快，上海也纷纷制定了新的人民币回流方法。With the quickening of RMB reforms, Shanghai is also scrambling to devise new RMB backflow methods.

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水供应和污水管道是否得到保护以免回流和交叉污染？Are water supply lines and sewage lines protected against backflow and cross-connection contamination?

双止回防回流阀用于低危险交叉连接。持续压力应用场合。DUAL CHECK VALVE BACKFLOW PREVENTER For low hazard cross-connections. Continuous pressure applications.

如向上泵送则必须先关闭截止阀，防止砼倒流，然后拆下出料管。Such as pumping up you must turn off valve to prevent backflow of concrete, then removed the feed tube.