Patent ID: 6305397
Filing Date: 2001-10-23
Classification: G05D,Y10T

Abstract:
A method for controlling fluid flow through a fluid flow line comprising the steps of:regulating at least one orifice valve of said fluid flow line, said at least one orifice valve being located upstream from a control valve;measuring fluid flow properties in said fluid flow line downstream from said at least one orifice valve but in advance of said control valve;providing, to a controller, at least one input signal responsive to said measured fluid flow properties and at least one orifice valve signal for operating said at least one orifice valve; andgenerating an output signal from said controller for selectively opening and closing said control valve to vary said fluid flow in the flow line, said output signal being generated by said controller in response to said at least one input signal and said at least one orifice valve signal.