____ would be a preventive maintenance item for an open close indicator.

• A. Manually Check the Percent Open-Closed Indicator Against the Actual Valve Opening
• B. Replace the Indicator Annually
• C. Adjust Electrical Wiring
• D. Lubricate the Moving Parts

Answer: (A)

Verifying the open-close indicator by comparing its reading to the actual valve opening tests the accuracy and reliability of the indicator itself. This preventive check ensures the display truly reflects where the valve is, so control decisions and safety interlocks act on correct information. If the indicator and the valve position disagree, operators can calibrate or adjust the indicator to restore trust in the reading, preventing misoperation.

Replacing the indicator on a fixed schedule isn’t a reliable maintenance approach, since the device only needs replacement when it drifts or fails. Adjusting electrical wiring isn’t about maintaining the indicator’s accuracy and can introduce safety risks or cause incorrect readings. Lubricating moving parts helps the valve mechanics but doesn’t ensure the position indicator is accurate, and lubrication could even affect readings if it reaches sensor components.