| 摘要 |
<p>A valve control apparatus for generating an anticipatory output response for controlling a fluid flow in a fluid flow line (20) includes a valve (12) provided inside the fluid flow line, at least one sensor for providing at least one input signal, said at least one input signal responsive to properties of said fluid flow in advance of said valve, and a letdown back-pressure controller (10) receiving said at least one input signal and providing a tunable output signal for selectively opening and closing said valve to vary flow in the flow line responsive to said at least one input signal. A method for controlling fluid flow through a valve in a fluid flow line with an anticipatory output response according to the invention comprising the steps of measuring fluid flow properties in said fluid flow line in advance of said valve, providing at least one input signal responsive to properties of said fluid flow to a letdown back-pressure controller, processing said at least one input signal by said letdown back-pressure controller, generating a tunable output signal from said letdown back-pressure controller for selectively opening and closing said valve to vary flow in the flow line responsive to said at least one input signal, and tuning said output signal from said letdown back-pressure controller.</p> |
