BELIMO SF actuators with spring return

New SF actuators with spring return

Complete peace of mind

Safe, powerful, versatile

The new generation of spring-return actuators was developed from the legendary AF actuator family, which has been proven in practice more than a million times. Thanks to their high torque, the new actuators provide an unprecedented level of safety. If the supply voltage fails, the return spring helps automatically move the damper or valve to a safe position.

Reliable protection

The new SF actuators feature a high torque of 20 Nm, both when moving and holding position. This ensures complete reliability – during both standard operation and activation of the safety function. Two ultrasonically welded housing covers, reinforced with steel plates and closed-profile posts, ensure tightness and stability. The built-in mechanical rotation-angle limiter stops the actuator in a position between 35% and 100% of the travel range, according to the user's requirements. The new gear switch makes it easy to lock the actuator in the position required for commissioning or maintenance work. Constant spring tension – achieved by a factory rotation of 5° – ensures that the damper closes tightly. In addition, profiled inserts and an improved clamp design ensure full reliability and safe movement of the damper shaft.

Universal and versatile

With its expanded range of spring-return actuators, Belimo offers ideal solutions for operating all dampers with a safety function. The option of using the actuator to make electrical connections provides greater flexibility when installing devices. An additional switch can be used to implement up to 4 switching points. New actuators with a torque of 20 Nm and spring return can be used for both dampers and valves, such as control ball valves or butterfly valves.