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STUFF Variable Speed Pumping in Constant Volume or Pressure applications Use of VSP as throttling valve or control valve Pressure is maintained by impeller speed, so if pressure at pump needs to stay constant regardless of flow, may not be much advantage to VSP. Steep vs flat curves Domestic Water Booster If dominated by friction rather than lift, VFD is appropriate.

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Closed-loop control (general) Closed-loop control is a procedure during which a quantity to be controlled (controlled quantity) is continually measured, compared to another quantity (reference quantity), and adjusted accordingly in a closed loop. Closed-loop control is therefore a process whereby the output variable also influences the control variable via feedback. The actual value of the ...

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How does a centrifugal pump produce pressure. Fluid particles enter the pump at the suction flange or connection. They then turn 90 degrees into the impeller and fill up the volume between each impeller vane. Figure 19. A more detail look at a more realistic cross-section of a closed impeller pump can be seen in Figure 19a. Figure 19a

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Nov 15, 2002 · However, when precise linearity is a must, closed-loop feedback is necessary. With closed-loop control, command inputs, amplifier card, and pump hardware remain the same.

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