VALVE POSITIONER HAVING BYPASS COMPONENT AND CONTROL VALVE COMPRISED THEREOF

摘要

Embodiments of a valve positioner that can maintain operation of the control valve despite failures in one or more components. These embodiments reduce downtime by allowing in-situ repair to occur on the valve positioner. In one embodiment, the valve positioner incorporates 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.

主权项

1. A device to change the position of a valve, comprising.
a converter component; and a by-pass component coupled with the converter component, the by-pass component having a first operating mode that couples a first input signal to the output and a second operating mode that conducts an second input signal to the output, wherein the first input signal is different from the second input signal.