Methods for adjusting the flow and pressure of screw pumps
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Methods for adjusting the flow and pressure of screw pumps: Why is it not allowed to use inlet and outlet valves for adjustment, and why is only frequency conversion or bypass adjustment permitted?
The inlet of the screw pump cannot be adjusted, which results in reduced flow, pump cavitation, and easy damage to the seals； Export regulation can easily lead to pressure buildup in screw pumps (positive displacement pumps) ； Therefore, only bypassing or frequency conversion can be chosen.
Screw pumps can be adjusted using frequency conversion and bypass.
Due to the characteristics of rotary pumps, the flow rate is only related to the pump’s speed, and in principle it follows a linear relationship. Bypassing is also one of the control methods, but it does not save energy. Throttling at the inlet or outlet cannot change the actual flow rate of the rotor pump, and operating in this condition for an extended period can damage the pump body and related components.
The screw pump is a positive-displacement pump, and the flow rate cannot be adjusted by adding control valves at the inlet and outlet