水泵出口装有逆止阀时，它会立即关闭，防止高压水反向流回水泵。
Export pump with check valve, it will immediately turn off to prevent reverse flow back high-pressure water pump.
分析了循环水泵出口液控蝶阀控制回路存在的问题，提出了改进的措施。
Problems about hydraulic control butterfly-valve are analyzed, and some irrational design and some improvement method are also put forward.
研究还发现，水泵出口断面轴向流速分布均匀度和速度加权平均偏流角也随壁面粗糙度改变而改变。
It is also discovered that the axial velocity distribution and velocity-weighted average swirl Angle at the outlet section of axial-flow pump vary with the changing of wall roughness.
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