Any small interruption—a price check, a chatty customer—can have downstream effects, holding up an entire line.
任何一个小小的中断，一个价格检查，一个喋喋不休的顾客，都会产生下游效应，拖住整个队伍。
2
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。
3
Any line restriction downstream of the unloader will change the Flow -actuated unloaders operating characteristics.