Belimo SRFA - rotary actuator for ball valves

Belimo SRFA – rotary actuator with safety function

SRFA is an actuator for ball valves. During operation, it moves the valve to the operating position and tensions the return spring. When the power supply is interrupted, the spring moves the valve to the closed position (NC; A – AB = 0%). For valves with an L-port, the documentation specifies A – AB = 100%.

Key features and specifications

• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Control: Close/Open; nominal voltage: AC 24...240 V / DC 24...125 V; frequency: 50/60 Hz.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 7 W; at rest: 3.5 W; power for cable sizing: 18 VA.
• Power and control connection: 1 m cable, 2x 0.75 mm².
• Mechanical position indicator and adjustable rotation angle with mechanical stops.
• Manual operation using a crank and locking switch.
• IEC/EN protection rating: IP54; NEMA/UL protection rating: NEMA 2.
• Ambient temperature: -30...50°C.

The actuator is mounted directly on the ball valve using one screw; the mounting orientation relative to the valve can be selected in 90° increments.