Belimo NRF24A-O - rotary actuator for ball valves

Belimo NRF24A-O – rotary actuator with fail-safe function

Actuator designed for ball valves. During operation, it moves the valve and tensions the return spring; if the power supply is interrupted, the spring moves the valve to the fail-safe position. For the specified direction of action, this is the open position (NO).

Key features and parameters

• Torque of the motor and fail-safe function: 10 Nm.
• Rated voltage: AC/DC 24 V; rated voltage frequency: 50/60 Hz.
• Rated voltage range: AC 19.2...28.8 V / DC 21.6...28.8 V.
• Control: Close/Open.
• Motor running time: 75 s / 90°; fail-safe function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 6 W; in the resting position: 2.5 W; for cable sizing: 8.5 VA.
• Power and control connection: 1 m cable, 2x 0.75 mm².
• Mechanical position indicator and rotation angle adjustment using mechanical stops.
• Manual operation using a crank with a locking switch.
• Protection rating: IP54; ambient temperature: -30...50°C [-22...122°F].

Direct mounting on the ball valve is carried out using one screw. The mounting position relative to the valve can be selected in 90° increments.