Pressure control for partial stroke tests

摘要

A method of testing a valve actuator coupled to a process control device includes the steps of: controlling, with the process control device, a pressure within the valve actuator to ramp from an initial pressure towards a pre-determined pressure limit; monitoring a position of the valve actuator to detect a travel of the valve actuator; and upon one of the pressure within the valve actuator reaching the pre-determined pressure limit or detecting the travel of the valve actuator, controlling the pressure within the valve actuator to return to the initial pressure.

主权项

1. A method of testing a valve actuator coupled to a process control device, the method comprising:
controlling, with the process control device, a pressure within the valve actuator to ramp from an initial pressure towards a pre-determined pressure limit; monitoring a position of the valve actuator to detect a travel of the valve actuator; upon one of the pressure within the valve actuator reaching the pre-determined pressure limit or detecting the travel of the valve actuator, controlling the pressure within the valve actuator to step to a stepped pressure higher or lower than the pre-determined pressure limit or the pressure at which the travel of the valve actuator is detected; and after controlling the pressure within the valve actuator to step to the stepped pressure, controlling the pressure within the valve actuator to return ramp from the stepped pressure to the initial pressure.