If due to a lack of space, valves such as butterfly valves can only be operated via a lever arrangement, the electric lever actuators SQF offer the optimum solution. They are based on the part-turn actuators SQ.
OPEN-CLOSE or modulating duty
Class A: OPEN-CLOSE duty. The actuator is required to drive the valve through 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 drive the valve to any position (fully open, intermediate and fully closed).
Class C:Modulation or modulating duty. The actuator is required to frequently drive the valve to any position between fully open and fully closed.