Gland packing is too tight
Actuator bench set is not proper or suitable
Process load change is too high
Trim is an unbalanced type
Actuator spring is broken
Air supply to the valve positioner / actuator is close or high, etc
Gland packing is too tight
Actuator bench set is not proper or suitable
Process load change is too high
Trim is an unbalanced type
Actuator spring is broken
Air supply to the valve positioner / actuator is close or high, etc