Description and Analysis of a Cascade Control of Fluid Flow

[+] Author and Article Information
M. J. Lampinen

Helsinki University of Technology, Helsinki, Finland

H. T. Toivonen

Process Control Laboratory, Chemical Engineering Department, Abo Akademi, Finland

E. J. Niskanen

Espoo, Finland

A. Kärkkäinen

Tekno-Innovaatio Oy, Turku, Finland

J. Dyn. Sys., Meas., Control 112(2), 261-269 (Jun 01, 1990) (9 pages) doi:10.1115/1.2896134 History: Received October 01, 1986; Revised March 16, 1989; Online March 17, 2008


A bypass flow control valve, which is a special kind of cascade control of fluid flow, is described and analyzed in this paper. The main idea of this control method is that the flow can be kept constant at varying pressure differences by using the existing pressure difference over the control valve as an energy source for making adjustments. Some flow-technical limits for the applicability of this method are examined. A theroetical consideration of a servocontrol system, where the desired volume flow is changed by external control, is also presented.

Copyright © 1990 by The American Society of Mechanical Engineers
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