differential pressure
... 托架压力(下水) poppet pressure 压力落差 pressure head 先行小组合代码 pre-sub code ...
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落差压力 head pressure ; haed pressure
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输油管道的大落差段有特殊的水力状态，设置压力调节站是适应这种水力状态而广泛采用的技术。
The hydraulic state in critical downhill section of long pipeline is unusual, and installing pressure regulation station is a widely used method for meeting its special requirement.
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