In their pump control bulletin Sundyne is advising to place the first throttling valve as close as possible to the outlet of the pump to avoid "flow surging" ; the liquid volume between pump and valve comes into an oscillation and placing the first valve as close as possible reduces the...
How steep should the curve of a centrifugal pump be for smooth control by a vsd (for different types of system curves )? In our installation we have pumps that are equipped with a restriction orifice to obtain a steep curve , they are on discharge pressure control and they are also operating in...
