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Feb26-12, 04:08 AM
P: 409
I haven't had academic studies in such topics but as a result working with pumps and compressors for years, I have some practical understanding of such matters.

The main difference between the pumps and the rest of the system is that the pump gives energy to the fluid while the rest of the system only receive energy .In a pump the fluid flows from the lower pressure to the higher pressure which may be also surprising to you.

For a given power of the pomp, of course the higher pressure can be achieved for a lower flow ( the power is proportional to the product of the flow and the pressure difference of the pump ends). likewise, if we get a large flow from the pump, e.g by opening the discharge valve wider, the power of the pump is spent on a larger amount of the fluid, the fluid velocity and consequently the pressure would be less.