Best Practices
Follow Manufacturer Settings
Torque, limit switches, and travel settings are factory-calibrated. Adjustments shall only be made by trained personnel following manufacturer manuals.
Do Not Open Sealed Housings
Electric actuators are sealed units (IP67/IP68). Opening covers without necessity risks moisture ingress and voids warranties.
Exercise Periodically
Operate actuators periodically to prevent gear seizure, lubricant settling, and limit switch sticking.
Environmental Protection
Ensure cable glands, breathers, and covers are intact. Wastewater environments are corrosive and humid.
Safe Manual Override
Always isolate electrical supply before using manual override. Never apply excessive force.
Separation of Responsibilities
This schedule applies to the actuator and motor only. Mechanical maintenance of the valve or penstock shall follow its own maintenance schedule.
Routine Inspection (Quarterly / As Required)
| Task | Why We Do This |
|---|---|
| Visual inspection of actuator housing and cable glands | Cracked housings or loose glands allow moisture ingress leading to electrical failure |
| Check for abnormal noise during operation | Grinding or knocking indicates gear wear or misalignment |
| Verify local and remote control operation | Ensures selector switches, control wiring, and interlocks are functioning correctly |
6 Monthly
| Task | Why We Do This |
|---|---|
| Operate actuator through full open and close cycle | Confirms smooth travel and correct limit switch operation |
| Check torque switch activation | Ensures actuator trips correctly under overload conditions |
| Inspect motor temperature during operation | Overheating indicates overload, poor ventilation, or internal motor issues |
| Check enclosure sealing and breather condition | Blocked or damaged breathers cause condensation buildup inside actuator |
Yearly
| Task | Why We Do This |
|---|---|
| Electrical insulation resistance test (motor windings) | Confirms insulation integrity and early detection of moisture ingress |
| Inspect terminal tightness and wiring condition | Loose terminals cause overheating and intermittent faults |
| Verify limit and torque switch settings | Prevents over-travel, mechanical damage, or incomplete valve closure |
| Inspect gearbox lubricant condition (if applicable) | Contaminated or degraded grease increases gear wear |
5–10 Years (Major Overhaul or Condition-Based)
| Task | Why We Do This |
|---|---|
| Replace gearbox grease or oil | Lubricant degrades over time even without frequent operation |
| Replace shaft seals and gaskets | Elastomer seals harden and lose sealing effectiveness |
| Inspect motor bearings and replace if worn | Bearing failure leads to motor seizure and actuator downtime |
| Full functional test after overhaul | Confirms actuator performance before returning to service |