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.
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.
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.
每个防回流阀需要四个。
在这里空气排出而水又从回流阀返回到叶轮入口。
Here the air and water discharged from the return valve to the back entrance of the impeller.
因此，所有防回流阀必须定期检测，以确保功能正常。
Therefore, all backflow preventers have to be tested periodically to ensure that they are functioning properly.
防回流阀必须有所支撑，不能用于承载立管的全部重量。
The backflow preventer must be supported and is not designed to carry full weight of the stand pipe.
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.
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.
下列检测程序是几种美国公认的防回流阀功能检测程序之一。
The following Test Procedure is one of several that is recognized throughout the United States for verification of the functioning of backflow preventers.
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.
下列检测程序是美国检测防回流阀通用的几种检测程序中的一种。
The following Test Procedure is one of several that is recognized throughout the United States for testing Backflow Preventers.
用户要由安全饮用水供应商在水表处安装法定的双止回防回流阀。
The user installs a dual check back flow preventer at the water meter as prescribed by the supplier of safe drinking water.
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.
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.
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。
A strainer should be installed as shown, ahead of backflow preventers to prevent discs from unnecessary fouling.
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。
Watts Dual Check Backflow Preventers can be specified in many different combinations of connection types, sizes, and union options.
气隙很容易安装在在009,909和909rpda防回流阀总成安全阀底部。
Air Gap installs easily to the bottom of the 009, 909 and 909rpda backflow assembly relief valve.
防回流阀必须安装在清晰可见的位置，以便能够立即注意到排放报警或其他故障。
Backflow preventers must be installed in high-visibility locations in order to allow for immediate notice of telltale discharge or other malfunction.
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。
If debris in the water system continues to cause fouling, a strainer can be installed upstream of the backflow assembly.
适用于检测压力真空断路阀，减压防回流阀或双止回阀总成，不再需要压力表和压差表。
Designed to test pressure vacuum breakers, reduced pressure backflow preventers or double check valve assemblies, allowing you to eliminate both pressure and differential test gauges.
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。
By installing a backflow preventer on any residential water system, you create a closed system that won't accommodate thermal expansion.
这种双止回防回流阀应该按照美国国家标准化组织(ASSE)标准1024进行设计。
The dual check backflow preventer shall be designed under the ASSE Standard 1024.
注意：适用于澳大利亚和新西兰：管路过滤器应该安装在上游关闭阀和防回流阀进口之间。
NOTE: For Australia and New Zealand, Pipeline strainers should be installed between the upstream shutoff valve and the inlet of the backflow preventer.
系列7防回流阀提供性价比高的、符合当地或州管道有关规定要求的公用水供应防回流保护装置。
The Series 7 Backflow Preventers provide cost-effective backflow protection of the public water supply when used according to the local or state plumbing code requirements.
系列7防回流阀提供性价比高的、符合当地或州管道有关规定要求的公用水供应防回流保护装置。
The Series 7 Backflow Preventers provide cost-effective backflow protection of the public water supply when used according to the local or state plumbing code requirements.
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