Solutions for Pneumatic Butterfly Valve Sticking Issues
Target Contaminants in the Fluid Stream
Over time, debris, sediment, or particulate matter can build up on the valve disc, seat, or internal passages, creating friction that causes sticking.
- Resolve this by installing appropriate filtration systems upstream to trap impurities before they reach the valve.
- Conduct regular cleaning of the valve interior using compatible solvents to remove existing deposits, ensuring no residue remains to hinder movement.
Inspect and Maintain Sealing Components
Worn or degraded seals such as O-rings, gaskets, or seat rings can deform or adhere to the disc, leading to sticking.
- Replace damaged seals with high-quality alternatives matched to the fluid type and operating conditions, including those with chemical resistance to handle corrosive fluids.
- Ensure proper alignment during replacement to avoid uneven pressure that contributes to sticking.
Ensure Adequate Lubrication
Insufficient or improper lubrication increases metal-to-metal friction between moving parts like the valve stem and bearings.
- Use lubricants compatible with the valve materials and operating temperature range, applying them at regular intervals to keep moving components smooth.
- Avoid over-lubrication, as excess grease can attract contaminants.
Check the Pneumatic Actuator
Inconsistent air pressure, leaking air lines, or worn actuator components such as diaphragms or springs can reduce the force needed to move the valve, resulting in sticking.
- Verify that the actuator receives stable, clean air supply.
- Repair any leaks in the air system.
- Replace worn actuator parts to restore full operating force.
Regular preventive maintenance—combining filtration, seal checks, lubrication, and actuator inspections—prevents recurring sticking and ensures reliable valve performance.
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