Description
The Belimo AFRB24-SR is a spring return electric ball valve actuator designed for precise modulating control of large HVAC valves. It operates on AC/DC 24 V and delivers 180 in-lb of torque with proportional 2–10 VDC control and integrated fail-safe functionality.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
HVAC Control Components |
| Part Number |
AFRB24-SR |
| Subcategory |
Valve Actuators |
| Actuator Type |
Electric, Spring Return, Modulating |
| Compatible Valve Size |
1-1/4 in to 3 in |
| Nominal Voltage |
AC/DC 24 V |
| Frequency |
50/60 Hz |
| Voltage Range |
AC 19.2–28.8 V / DC 21.6–28.8 V |
| Power Consumption (Operation) |
5.5 W |
| Power Consumption (Rest) |
3 W |
| Transformer Sizing |
8.5 VA |
| Control Signal |
2–10 VDC (4–20 mA with resistor) |
| Input Impedance |
100 kΩ (2–10 V), 500 Ω (4–20 mA) |
| Position Feedback |
2–10 V, max. 0.5 mA |
| Torque Output |
180 in-lb |
| Angle of Rotation |
90° |
| Running Time (Motor) |
95 s / 90° |
| Running Time (Fail-Safe) |
<20 s |
| Manual Override |
5 mm hex crank (included) |
| Overload Protection |
Electronic, full rotation |
| Degree of Protection |
NEMA 2 |
| Electrical Connection |
18 AWG cable, 1 m, 1/2 in NPT |
| Power Source |
UL Class 2 |
| Weight |
5.4 lb (2.4 kg) |
Information About AFRB24-SR
The AFRB24-SR is a Belimo spring return actuator engineered for ball valve control in hydronic heating and cooling systems. It supports proportional modulation using a 2–10 VDC signal and provides position feedback for monitoring and closed-loop control. The integrated spring return mechanism ensures the valve moves to a defined safety position during power loss. Its robust mechanical design and included WAF linkage support reliable operation on larger valves in commercial HVAC installations.
Key Features
- Spring return fail-safe operation: Automatically drives the valve to a predefined safety position when power is lost.
- Modulating control capability: Accepts a 2–10 VDC control signal with optional 4–20 mA support for flexible system integration.
- High torque output: Provides 180 in-lb of torque for dependable actuation of large-diameter ball valves.
- Integrated position feedback: Supplies a 2–10 V feedback signal for accurate valve position monitoring.
- Selectable direction of rotation: Motor direction can be configured by switch, with reversible fail-safe action via mounting orientation.
- Manual override provision: Includes a hex crank to allow manual positioning during commissioning or maintenance.
- Electronic overload protection: Protects internal components throughout the full rotation range to enhance durability.
The AFRB24-SR delivers the reliability and precision required for safe, accurate modulating control of ball valves in professional HVAC systems.
