Instead the pump impeller should be trimmed or valves located else where in the system to partially throttle the flow.

代替泵叶轮应该经过修整，或者阀门应该位于系统部分节流的地方。

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Soft start valves are used to throttle the gas flow in roughing lines. They prevent turbulences in piping and containers, particulate contamination in vacuum installations.

软启动阀适用于在粗加工过程中调节燃气气流，能防止管道和容器中的气体动荡、真空装置的微粒污染等。

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The numerical simulation was used to analyze the flow characteristics of cryogenic throttle valves. A test bench was also built up to investigate the performance of the different valve needles.

运用数值模拟方法分析了节流阀的流量特性，并运用实验的手段测量了其流量系数与阀门开度之间的关系。

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