July 1998

Special Report: Fluid Flow

Improve valve and pump sizing

Understand how flow system components interact for more efficient designs

Fehr, M., Federal University at Uberlandia

Starting from a given piping installation, a control valve and pump will be selected and the correspondence between valve setting and flowrate will be determined. The procedure is a logical sequel to the work of Connell1 and illustrates the interaction between pump, valve and pipe. Connell's method is extended to include the choice of the control valve and visualization of its operating range. Quality of control can be deduced from the operating diagram. Introduction. Ever since the publication of Connell's equations in 1987, the correct prediction of pressure drop requirements for control valves has been straightforward. Consequently, the correct pump for a flow controlled piping l

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