아래의 영어 읽어보면 flow rate가 증가하면 왜 펌프에 걸리는 압력이 줄어 드는거죠?

Pump Characteristic Curve

Depending on the type of pump, the actual pump discharge pressure may vary.As flow rate increases, the pump discharge pressure is usually decreased and the information on this can be obtained from the vendor of each pump.

In this applet, it is assumed that the pump discharge pressure is constant no matter what the flow rate is.