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