Belimo SRF24A - rotary actuator for ball valves

Belimo SRF24A – rotary actuator with safety function

SRF24A is designed for ball valves. During operation, the actuator moves the valve and tensions the return spring. If the power supply is interrupted, the spring moves the valve to the safety position: closed (NC; A–AB = 0%). For valves with an L-shaped port, the data sheet specifies A–AB = 100%.

Key features and specifications

• Motor torque: 20 Nm; safety function torque: 20 Nm.
• Rated voltage: AC/DC 24 V; frequency: 50/60 Hz.
• Voltage range: AC 19.2...28.8 V / DC 21.6...28.8 V.
• Control: Close/Open.
• Motor running time: 75 s / 90°; safety function running time: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 5.5 W; at rest: 1.5 W; for cable sizing: 7.5 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 with locking switch.
• Degree of protection: IP54; NEMA 2; UL Enclosure Type 2 housing.

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