Pneumatic Actuator Troubleshooting Guide
Common faults and solutions for spring return pneumatic actuators
Spring return pneumatic actuators, while reliable, can develop common faults that disrupt their performance, most of which stem from air supply issues, component wear, or environmental damage.
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Air Leakage
Reduces the actuator's ability to generate sufficient force for valve operation or reset. Leaks often occur at seal points or in damaged air hoses.
Troubleshooting Steps
Inspect all seals for signs of cracking, hardening, or wear; replace any deteriorated seals. Check air hoses for cracks, loose fittings, or kinks; tighten connections and replace damaged hoses.
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Failure to Reset
Issue typically relates to the actuator's spring: the spring may be broken, weakened due to fatigue, or blocked by debris.
Troubleshooting Steps
Disconnect the air supply and observe if the actuator returns to the pre-set position. If not, inspect the spring and replace if broken or weakened. Clear any accumulated debris from the spring chamber.
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Reduced Torque or Slow Operation
Often caused by inadequate air pressure, contaminated air supply, or worn internal components.
Troubleshooting Steps
Verify the supply pressure matches the actuator's recommended range. Install or replace air filters, dryers, or lubricators. Inspect the piston and cylinder for scratches or wear.
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Unusual Noises
Grinding or squealing during operation indicates mechanical friction or misalignment.
Troubleshooting Steps
Check the actuator's lubrication and apply manufacturer-approved lubricant. Inspect gears for chipping or excessive wear. Check if the actuator is properly mounted to the valve and realign if necessary.
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