The active systems consist of several pumping systems of varying discharge pressure and flow rates, e. g., high head injection system, low head injection system.
能动系统由不同注入压力和流量的泵系统组成，如高压安注系统，低压安注系统。
The valve is an impeding part with larger pressure head loss and a lot of discharge energy consumed.
风量调节阀系阻性部件，存在较大的压头损失，须消耗大量送风能量。
In general, the head pressure of power station in river channel is lower comparatively, but the unit discharge is always greater, in this way, the dimension of the hydropower house is usually larger.
河床式水电站水头比较低，而单机流量通常较大，这样水电站厂房的进水口、蜗壳和尾水管等尺寸较大。
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