The method of controlling pump flow by Chemical self-priming pump

Method 1. Adjustment of outlet valve opening
In this method, the pump is connected in series with the outlet pipeline control valve, and its actual effect is like the use of a new pump system. The large output pressure head of the pump does not change, but the flow curve attenuates.

Method 2. Bypass valve regulation
In this method, the valve and the self-priming pump are connected in parallel, and its actual effect is like the use of a new pump system, the large output pressure head of the pump is changed, and the characteristics of the flow curve are also changed, and the flow curve is more linear.

Method 3. Adjust the diameter of impeller
This method does not use any external components, and the flow characteristic curve varies with the diameter.

Method 4. Speed control
The change of the speed of the impeller directly changes the flow curve of the fluoroplastic self-priming pump, and the characteristics of the curve do not change. When the speed decreases, the curve becomes flat, and the pressure head and large flow rate decrease.
The overall efficiency of the pump system outlet valve regulation and bypass regulation methods increase the pipeline pressure loss, and the pump system efficiency is greatly reduced. The impeller diameter adjustment has little effect on the efficiency of the whole pump system, and 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.