Control Valve Maintenance
Control valve maintenance preserves the ability of a valve, actuator, and positioner to regulate process flow, pressure, level, or temperature accurately.
What this term means in maintenance
Control valve maintenance preserves the ability of a valve, actuator, and positioner to regulate process flow, pressure, level, or temperature accurately.
Components maintained
A control-valve assembly may include:
- Valve body
- Trim
- Seat
- Stem
- Packing
- Actuator
- Positioner
- Air supply
- Feedback
- Accessories
Practical example
A valve with poor response is inspected for stiction, packing friction, air leaks, positioner calibration, and trim wear.
Performance issues
Common problems include leakage, hunting, deadband, slow travel, incorrect stroke, vibration, and erosion.
Testing
Work may include stroke testing, leakage testing, calibration, air-supply checks, and control-loop verification.
Common mistake
Calibrating the positioner without correcting mechanical friction or damaged trim can leave control performance poor.
Related concepts
Related maintenance terms
Keep exploring connected CMMS, reliability, and maintenance planning terms.
Loop Calibration
Loop calibration verifies the measurement and output performance of an instrument loop from the sensing point through signal transmission to indication or control.
Condition Monitoring
Condition monitoring is the systematic collection and review of equipment-condition information to identify deterioration, abnormal operation, or developing failure.
Mechanical Seal Failure
Mechanical seal failure occurs when a rotating-equipment seal can no longer control leakage between a rotating shaft and stationary housing.
Glossary FAQs
- What does control-valve maintenance cover?
Valve body, trim, seat, stem, packing, actuator, positioner, air supply, and feedback.
- What problems are common?
Leakage, stiction, hunting, deadband, slow travel, incorrect stroke, vibration, and erosion.
- Is positioner calibration always enough?
No. Mechanical friction, trim wear, air leaks, and process conditions must also be checked.