VALVE POSITIONER WITH OVERPRESSURE PROTECTION CAPABILITIES

摘要

FIELD: machine building.;SUBSTANCE: method is intended for limiting control pressure provided to an actuator of a valve coupled to a valve positioner, wherein a drive signal is provided to a pneumatic stage of the valve positioner. Pneumatic stage is arranged to control output pressure of the valve positioner in accordance with the drive signal. 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.;EFFECT: preventing damage to the actuator.;23 cl, 7 dwg