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US 10,240,621 B2Granted
Valve positioner having bypass component and control valve comprised thereof
AssigneeDresser, Inc.
InventorSandro Esposito
Life of this patent
Estimating the term…
Abstract
A valve positioner that can maintain operation of the control valve despite failures in one or more components. The valve positioner may reduce downtime by allowing in-situ repair to occur on the valve positioner. The valve positioner may incorporate a by-pass component, which can utilize control input signals (e.g., a 4-20 mA signal) to energize one or more components (e.g., a current-to-pressure converter) to cause the control valve to modulate fluid flow without the digital microprocessor and/or related components.
Claims10
A circuit for use in a valve positioner to control operation of a valve, the circuit comprising:
- a processor;
- a switch coupled with the processor to receive an input power signal and an operating signal from the processor;
- and
- a current-to-pressure converter coupled to the switch,
- wherein the processor is operative to:
- receive a feedback signal having a value that defines an operating parameter for the valve, and
- generate the operating signal having a level corresponding to the value of the feedback signal,
- wherein the switch is operative to change between a first state and a second state in response to the level of the operating signal so as to conduct the input power signal to the current-to-pressure converter from the processor in the first state or from a source different from the processor in the second state.
5 more elements
Dependencies are inferred from the claim text.