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.

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