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Q&A Resource
How is duty cycle specified?
Quick Answer
Duty cycle can be specified in several ways, depending on the valve or actuator manufacturer. Common methods include cycles per hour, starts per hour, percentage duty cycle, or continuous-duty ratings. Because there is no single industry-wide format, it's important to review the manufacturer's published specifications for the specific equipment.
KEY TAKEAWAYS
- There is no single universal method for specifying duty cycle.
- Manufacturers commonly use multiple ratings to describe equipment limits
- Review manufacturer's specifications when selecting an actuator for frequent cycling.
- Duty cycle should be considered alongside torque, speed, and operating conditions during actuator selection.
Why It Matters
Understanding how duty cycle is specified helps ensure that an actuator is matched to the application's operating demands. Even if an actuator provides adequate torque or thrust, exceeding its duty cycle rating can lead to overheating, accelerated wear, and reduced service life.
Common Ways Duty Cycle Is Specified
Manufacturers may express duty cycle as:
- Cycles per hour (or per minute/day)
- Starts per hour
- Percentage duty cycle (the percentage of time the actuator can operate within a given period)
- Continuous-duty or intermittent-duty ratings
- Expected cycle life (total number of operating cycles)
The terminology and test methods may vary by manufacturer and actuator type, so published ratings should always be interpreted according to the manufacturer's documentation.
Want to learn more?
See "What Is Duty Cycle? How Does It Relate to Valves?" for a more detailed explanation of duty cycle, why it matters, and how it influences valve and actuator selection.
