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。
Therefore, all backflow preventers have to be tested periodically to ensure that they are functioning properly.
因此，所有防回流阀必须定期检测，以确保功能正常。
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。
The following Test Procedure is one of several that is recognized throughout the United States for testing Backflow Preventers.
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。
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。
Backflow preventers must be installed in high-visibility locations in order to allow for immediate notice of telltale discharge or other malfunction.
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。
The following Test Procedure is one of several that is recognized throughout the United States for verification of the functioning of backflow preventers.
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 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。
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.
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。
If installed on a fire sprinkler system, all mechanical checks, such as alarm checks and backflow preventers, should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25.
如果安装在防火喷淋系统上，所有机械式止回阀，如警告止回阀和防回流阀，都应该根据美国国家消防协会NFPA13和NFPA25标准进行流量测试和内部检查。
If installed on a fire sprinkler system, all mechanical checks, such as alarm checks and backflow preventers, should be flow tested and inspected internally in accordance with NFPA 13 and NFPA 25.
如果安装在防火喷淋系统上，所有机械式止回阀，如警告止回阀和防回流阀，都应该根据美国国家消防协会NFPA13和NFPA25标准进行流量测试和内部检查。
应用推荐