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。
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。
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