Belimo LRF24-S-O - rotary actuator for ball valves

Belimo LRF24-S-O rotary actuator

Fail-safe actuator for ball valves. During operation, it moves the valve to its operating position and tensions the return spring. If the power supply is interrupted, the spring moves the valve to its fail-safe position: open (NO), A–AB = 100%. For valves with an L-port, the documentation specifies A–AB = 0%.

Key features and specifications

• Motor and fail-safe torque: 4 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°.
• Travel time to fail-safe position: <20 s @ -20...50°C, <60 s @ -30°C.
• Power consumption during operation: 5 W; at rest: 2.5 W; sizing power: 7 VA.
• Auxiliary switches: 2x SPDT, 1x 10° / 1x 85°.
• Power and control connection: 1 m cable, 2x 0.75 mm²; auxiliary switch connection: 1 m cable, 6x 0.75 mm².
• Mechanical position indicator and manual adjustment with a crank, with the option to lock in any position.
• Protection rating: IP54; ambient temperature: -30...50°C.

Direct mounting on the ball valve is carried out using one screw. The mounting orientation relative to the valve can be selected in 90° increments. The actuator is overload-protected and stops automatically when it reaches the end position.