SUNVIC SD 2701 SPRING RETURN ACTUATOR 4W 302131

This Sunvic SD2701 three port mid-position spring return actuator works on the principle of a motor being energised when the actuator holds the valve open. As the actuator rotates, a spring inside is wound up and the motor stalls out. When power is removed, energy in the coiled spring is released, closing the valve and stopping the actuator.