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What is duty cycle?

From Indelac Controls, Inc.

Duty cycle is the ratio of actuator on time to off time and is used to
determine the proper actuator for a specific application. It is also used to
determine an acceptable operating time so that the thermal over load in
the motor is not exceeded during valve or damper automation. Actuator
inefficiencies cause the motor temperature to rise and at a critical
temperature the thermal over load is activated and the actuator is shut
down. The actuator is inoperative (undesirable in most applications) for a
period of time allowing the motor to cool and the thermal over load to
reset.

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Products & Services
Valve Actuators
Valve actuators mount on valves and, in response to a signal, move a valve to a desired position using an outside power source.
Electric Valve Actuators
Electric valve actuators mount on valves which, in response to a signal, automatically move to a desired position using an outside power source. Single-phase or three-phase AC or DC motors drive a combination of gears to generate the desired torque level.
Manual Valve Actuators
Manual valve actuators do not require an outside power source. They use a handwheel or lever to drive a series of gears whose ratio results in a higher output torque compared to the input (manual) torque.
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