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Actuators
According to ISO 22153, a linear actuator is an actuator which transmits thrust to the valve for a defined linear stroke.
Electric linear actuators performing a linear movement for automating globe valves, for example, can be combinations of SA ... multi-turn actuators and LE linear thrust units.
If a lever arrangement has to be operated, the LE linear trust unit can also be mounted onto a base.
Class A: OPEN-CLOSE duty. The actuator is required to operate the valve across its entire travel from the fully open position to the fully closed position or vice versa.
Class B: Inching, positioning or positioning duty. The actuator is required to occasionally operate the valve to any position (fully open, intermediate and fully closed).
Class C: Modulation or modulating duty. The actuator is required to frequently operate the valve to any position between fully open and fully closed.
