1. Outlet valve opening degree regulating the
pump and the outlet pipeline valve series, its actual effect as the new
pump system, the maximum pump output pressure head did not change, but flow curves were somewhat attenuated.
2. Bypass valve regulating the valves and
pumps in parallel, its actual effect as the new pump system, the maximum pump output pressure head changed. At the same time, the flow characteristic curve changes, flow curve closer to linear.
3. Adjust the impeller diameter this method does not use any external components, the flow characteristic curve with the change of the diameter change.
4. Speed control of the impeller speed change directly change the
pump flow curve, the characteristics of the curve does not change, the speed decreases, the curve becomes flat, the pressure head and the maximum flow rate are reduced.
The overall efficiency of the pump system outlet valve adjustment and bypass adjustment methods are increased pipeline pressure loss, pump system efficiency is significantly reduced. Impeller diameter adjustment to the entire pump system efficiency is small, the speed control method basically does not affect the system efficiency, as long as the speed is not less than 50% of the normal speed.
