Valve positioner system

摘要

The invention relates to performing diagnostics on a valve having an actuator. The method comprises: Positioning the valve at a first end of a test range of valve positions; incrementing fluid pressure to the actuator until it reaches a second end of the test range; decrementing fluid pressure to the actuator until it reaches the first end of the test range; sampling valve position and actuator pressure data during the incrementing and decrementing; storing the sampled position and pressure data in memory; and analyzing the stored data. The system comprizes the means for performing said method. <IMAGE>