Five Common Mistakes in Actuator Selection — and How to Avoid Them

Five Common Mistakes in Actuator Selection — and How to Avoid Them

In automated valve systems, actuator selection may appear straightforward, yet it is one of the most error-prone stages of project design.
Many operational issues are not caused by product defects, but by incorrect assumptions during the selection process.

Below are five common actuator selection mistakes and practical recommendations to avoid them.

Mistake 1: Selecting Based Only on Nominal Torque

Relying solely on nominal valve torque often leads to insufficient actuator output in real conditions.
Media pressure, temperature variation, and seal aging can significantly increase operating torque.

Recommendation:
Allow a 20%–30% safety margin over the calculated torque.

Mistake 2: Ignoring Fail-Safe Requirements

Some projects realize too late that a defined valve position is required during air failure.

Recommendation:
Clearly define the required valve position in case of air loss at the selection stage.

Mistake 3: Overlooking Environmental Conditions

Extreme temperatures, outdoor exposure, humidity, and corrosive atmospheres can affect actuator lifespan.

Recommendation:
Select appropriate sealing designs, surface treatments, and protection classes based on actual conditions.

Mistake 4: Insufficient Interface and Standard Compatibility

Ignoring standards such as ISO 5211 or NAMUR may cause installation difficulties or additional modification costs.

Recommendation:
Confirm mounting interfaces, shaft types, and accessory standards in advance.

Mistake 5: No Consideration for Future Automation Expansion

Selecting only for current requirements may limit future upgrades.

Recommendation:
Allow space and interface options for solenoids, limit switches, and positioners.

Conclusion

Effective actuator selection is less about complex calculations and more about comprehensive understanding of operating conditions and system needs.
Avoiding common mistakes at the early stage leads to more reliable systems and lower long-term maintenance risks.