The four methods of control pump flow

Method one: the outlet valve opening

This method of pump and export pipeline valve series, its actual effect as adopted a new pump system, the maximum output of the pump head has not changed, but the flow curve attenuation.

Method 2: bypass valve adjustment

Valves and pumps in parallel in this approach, its practical effect as adopted a new pump system, the maximum output of the pump head change, flow curve characteristics at the same time also produces change, more close to the linear flow curve.

Method 3: adjust the impeller diameter

This method does not use any external components, flow characteristic curve changes over diameter.

Method 4: speed regulation control

Directly change the flow curve of the pump impeller rotational speed change, do not change the characteristics of the curve speed decreases, the curve flat, pressure head and maximum flow are reduced. Pump system, the overall efficiency of the outlet valve regulating and by-pass adjustment method are increased the pipeline pressure loss, pump system efficiency is greatly reduced. Impeller diameter adjustment less impact on the efficiency of pump system, speed control method for basic does not affect system efficiency, as long as the speed of less than 50% of the normal speed. Energy consumption level: assume that through the above four kind of way to pump output flow from 60 m3 / h to adjust to the 50 m3 / h, the output is 60 m3 / h when the power consumption of 100% (the pressure head is 70 m), then several kinds of method of traffic control effect on the consumption of the pump power? (1) the outlet valve opening adjustment, energy consumption was 94%, the traffic is low consumed power. (2) the by-pass adjustment, the bypass valve will reduce the head of the pump to the 55 m, this can only be achieved by increasing the flow of the pump, the energy consumption increased by 10%. (3) to adjust the impeller diameter, narrow impeller diameter of pump output flow and pressure after being reduced, energy consumption reduced by 67%. (4) speed regulation control, speed is reduced, the pump flow rate and pressure head are reduced, energy consumption reduced by 65%.