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 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。
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。
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