Control supply line water pressure. install a soft seated spring loaded check valve upstream of the assembly.
控制供应管道的水压。在总成的上游安装一个软阀座，弹簧负载止回阀。
Butterfly or similar type valves should be installed in the line upstream and downstream of the automatic control valve to allow for maintenance service.
在自动控制阀的上游和下游应该安装蝶阀或类似的阀门，以便于进行维护维修。
Butterfly or similar type valves should be installed in the line upstream and downstream of the automatic control valve to allow for maintenance service.
在自动控制阀的上游和下游应该安装蝶阀或类似的阀门，以便于进行维护维修。
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