Valve positioner with overpressure protection capabilities
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United States of America Patent
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Oct 11, 2016
Grant Date -
Jul 9, 2015
app pub date -
Jan 9, 2014
filing date -
Jan 9, 2014
priority date (Note) -
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Abstract
A method of limiting control pressure provided to an actuator of a valve coupled to a valve positioner, a drive signal is provided to a pneumatic stage of the valve positioner. The pneumatic stage is arranged to control output pressure of the valve positioner in accordance with the drive signal. A pressure measurement from a pressure sensor communicatively coupled to the valve positioner is obtained, and an abnormal pressure is detected based on the pressure measurement. In response to detecting the abnormal pressure, the drive signal is controlled so as to limit the output pressure of the valve positioner, wherein the output pressure provides control pressure to the actuator.
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