The Johnson Controls VA9104-AGA-2S Valve Actuator is an essentialpart which can be used to control positions of the valves in HVAC systems. It has a 24V AC/DC input power, a floating control signal that lasts for 60 seconds and a 48” cord that makes it easy to integrate and install the device. https://www.partshnc.com/vlvact-nsr-fltg-24v60s-48cbl