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US 11,421,799 B1Granted
Accuracy of control valves using a long-stroke position converter
AssigneeDresser, Inc.
InventorsJustin Walter Betley, John Gregory Canning
Life of this patent
Estimating the term…
Abstract
A position transfer device is configured for use on a control valve. These configurations may convert a linear position of a closure member on the control valve to an angular position of magnets. A sensor in proximity to the magnets can generate a signal in response to the angular position. In one implementation, a valve positioner or controller can process the signal to identify the position of the closure member relative to a seat.
Claims20
A valve assembly, comprising:
- a pneumatic actuator;
- a valve stem coupled with the pneumatic actuator;
- a shaft coupled with the valve stem and configured to move concomitantly with the valve stem;
- and
- a rotatable mechanism coupled with the shaft, the rotatable mechanism comprising magnets that have an angular position that corresponds with a linear position of the valve stem.
2 more elements
A valve assembly, comprising:
- a seat;
- a closure member moveable relative to the seat;
- and
- a position transfer device coupled with the closure member, the position transfer device having a first moveable member and a second moveable member including magnets, the first moveable member assuming a linear position that corresponds with a location for the closure member relative to the seat, the second moveable member setting an angular position for the magnets to correspond with the linear position of the first moveable member.
1 more element
A control valve, comprising:
- a valve with a closure member, a seat, a valve stem, and an actuator;
- a measurement system configured to measure a position of the closure member, the measurement system comprising:
- a sensor;
- a shaft coupled with the closure member, the shaft moveable along a first axis to a position that corresponds with a location for the closure member relative to the seat;
- a pair of magnets coupled with the shaft and in proximity to the sensor, the pair of magnets rotatable about a second axis that is perpendicular to the first axis.
2 more elements
Dependencies are inferred from the claim text.