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Quick Diagnosis Table
| Symptom | Most Likely Cause | First Action |
|---|---|---|
| No movement | No air supply / stuck solenoid | Check pressure (4–8 bar) / test solenoid |
| Slow operation | Low pressure / clogged filter | Clean FRL unit / check seals |
| Stops mid-stroke | Torque mismatch / mechanical bind | Verify valve torque / lubricate linkage |
| Erratic cycling | Positioner failure / bad signal | Recalibrate / check 4–20mA signal |
| Air leakage | Worn seals / loose bolts | Tighten bolts / replace seal kit |
| Spring return fails | Broken spring | Disassemble spring chamber / replace spring |
| Excessive noise | Lack of lubrication | Apply air tool oil |
Step-by-Step Troubleshooting
1. Actuator Does Not Move
Verify air pressure (60–120 psi)
Check solenoid valve voltage
Test manual override
Disconnect from valve to isolate issue
2. Actuator Moves Too Slowly
Clean or replace air filter
Check for kinked hoses
Replace worn piston seals
3. Air Leakage
Apply soapy water to find leaks
Tighten housing bolts
Replace seal kit if leaks persist
4. Spring Return Fails
Disconnect air supply – should return immediately
If not, spring is likely broken
Replace spring and clean chamber
Preventive Maintenance Checklist
| Task | Frequency |
|---|---|
| Check air pressure | Daily |
| Drain FRL unit | Weekly |
| Lubricate actuator | Monthly |
| Inspect seals | Quarterly |
| Replace seal kit | Every 2–3 years |
| Recalibrate positioner | Annually |
Replace vs. Repair
| Condition | Action |
|---|---|
| Worn seals | Repair |
| Broken spring | Repair |
| Scored cylinder bore | Replace |
| Cracked housing | Replace |
| Undersized actuator | Replace |
Need Technical Support?
We supply pneumatic actuators for ball valves, butterfly valves, and gate valves:
| Series | Torque | Mounting |
|---|---|---|
| AT Series (rack & pinion) | 5–4000 Nm | ISO 5211 |
| Scotch Yoke | 500–250,000 Nm | ISO 5211 / Custom |
Contact us for troubleshooting help or replacement quotes.
Pneumatic Actuator | Valve Automation | B2B Industrial Supplier
Ivan (Mobile:+86-18968769287)
WhatsApp：+86-13579991606
Wechat:+86-18968769287
Website： www.kinko-flow.com
ZHEJIANG KINKO FLUID EQUIPMENT CO.,LTD
info@kinko-flow.com
+86-133 5611 9006
