Rotary actuator with emergency function NRFA-O for two and three way Belimo ball valves. It can be used for both open / closed versions and control versions of ball valves.

Drive version NO - no voltage open .

Properties

• Without electrical voltage, the actuator keeps the tap open. When the current is switched on, the actuator moves the valve to the working position, while the return spring is tensioned. When the current is interrupted, the spring opens the valve again.
• Easy direct mounting on a ball valve with one screw. No additional mounting adapter is required. The mounting position in relation to the ball valve is selectable in steps of 90 °.
• The ball valve can be adjusted and fixed in any position with the hand lever. Unlocking is performed manually or automatically by applying the supply voltage.
• The drive is protected against overload, does not need any end stops and automatically remains at the stop.