Four required per backflow preventer.
每个防回流阀需要四个。
The happy blood is unable the backflow centripetal dirty.
幸福的血液无法回流向心脏。
The backflow preventer must be installed upstream of the regulator.
防倒流装置必须安装在调节阀的上游位置。
The system should be flushed before the backflow valve is installed.
在安装回流阀之前系统应该进行冲刷。
Installing a backflow preventer in a pit or vault is not recommended.
不建议在坑内或拱顶内安装防回流阀。
Who could go back in time, even if backflow, and we can hold for what?
谁也无法将时光倒流，就算倒流，我们又能抓得住什么呢。
The relief valve may be serviced while on or off the backflow preventer valve.
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。
When installing a drain line, use Series 909 air gaps on Model 909 backflow preventers.
在安装排泄管线时，在型号909防回流阀上采用系列909气隙。
Then it also analyzes the policy and tendency of Shanghai overseas talented person backflow.
然后分析了上海市海外人才回流的政策和趋势。
Designed to retrofit backflow protection onto fire hydrants used for temporary water service.
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。
The details of the flow fields such as the backflow, vortex and secondary flow were revealed.
揭示了导叶内部回流、漩涡，以及出口流动滞止区、二次流等流动细节；
Such as pumping up you must turn off valve to prevent backflow of concrete, then removed the feed tube.
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。
The role of the check valve to prevent water backflow, with the film door, also do not need a check valve.
逆止阀的作用是防止水倒流，有了拍门后，也就不需要逆止阀了。
During this time molten metal may backflow from the molten risers to feed the part and maintain the same shape.
在此期间熔化金属可能从冒口回流供给零件以保持其形状不变。
A strainer should be installed as shown, ahead of backflow preventers to prevent discs from unnecessary fouling.
应该如图所示在防回流阀前安装一个过滤器，防止阀瓣出现不必要的污垢。
The TK-DL can test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies.
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。
Headstock piece on media flows and forces open or closed to prevent backflow valve media called a non-return valve.
启闭件靠介质流动和力量自行开启或关闭，以防止介质倒流的阀门叫止回阀。
If debris in the water system continues to cause fouling, a strainer can be installed upstream of the backflow assembly.
如果水系统内的碎片继续造成污染，则需要在防回流阀总成的上游安装一个过滤器。
A study was made of the feasibility and effect of feeding during settlement in non-backflow intermittent aeration system (NBIAS).
对无回流间歇曝气系统在沉淀期间进水的可行性和进水效应进行了研究。
Watts Dual Check Backflow Preventers can be specified in many different combinations of connection types, sizes, and union options.
美国瓦茨双止回防回流阀可以按照连接类型、通径和接头构成许多不同的组合。
Now, with so many foreign firms accumulating so much RMB, pressure is building to establish RMB backflow channels and an RMB offshore market.
如今，有如此多的外国公司积累了如此多的人民币，那么建立人民币回流渠道和一个人民币的离岸市场的压力也就越来越大。
By installing a backflow preventer on any residential water system, you create a closed system that won't accommodate thermal expansion.
通过在任何住宅水系统上安装一个防回流阀，可以形成一个无法适应热膨胀的封闭系统。
Building codes may also require anti-siphon or backflow devices, so surface water won't be pulled back into water lines and residential plumbing.
建筑法规可能还需要防虹吸或回流装置，使地表水不会被拖进水管道线路和住宅回来。
Building codes may also require anti-siphon or backflow devices, so surface water won't be pulled back into water lines and residential plumbing.
建筑法规可能还需要防虹吸或回流装置，使地表水不会被拖进水管道线路和住宅回来。
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