Intelligent valve flow linearization
First Claim
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1. A valve positioner system that controls a flow rate of a fluid through a valve flow modulating member that is controlled by a position of a valve stem, the system comprising:
- a valve positioner coupled to the valve stem and configured to measure a position of the valve stem;
a feed-forward flow controller configured to;
receive the measured valve stem position from the valve positioner, receive the target flow rate from the flow controller, and calculate a target valve stem position based on the target flow rate;
wherein the valve positioner adjusts the valve stem position until a position of the valve stem matches the target valve stem position.
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Abstract
A feed-forward flow controller is designed to calculate a target valve position from a target flow. Correction is made for liquid or gas pressure drop across the valve and for the valve flow modulating member geometry. This feed-forward action may also be used to linearize a feed-back flow control loop.
47 Citations
12 Claims
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1. A valve positioner system that controls a flow rate of a fluid through a valve flow modulating member that is controlled by a position of a valve stem, the system comprising:
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a valve positioner coupled to the valve stem and configured to measure a position of the valve stem;
a feed-forward flow controller configured to;
receive the measured valve stem position from the valve positioner, receive the target flow rate from the flow controller, and calculate a target valve stem position based on the target flow rate;
wherein the valve positioner adjusts the valve stem position until a position of the valve stem matches the target valve stem position. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A valve positioner system that controls a flow rate of a fluid through a valve flow modulating member that is controlled by a position of a valve stem, the system comprising:
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a valve positioner coupled to the valve stem and configured to measure a position of the valve stem; and
a feed-forward flow controller configured to;
receive the measured valve stem position from the valve positioner, receive the target flow rate from the flow controller, receive a pressure coefficient, calculate a first flow area based on the target flow rate and the pressure coefficient;
calculate a second flow area that corresponds to the measured valve stem position, calculate a flow rate based on the calculated second flow area and the pressure coefficient, calculate a target valve stem position based on the calculated first flow area;
wherein the valve positioner adjusts the valve stem position until a position of the valve stem matches the target valve stem position.
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Specification