Description
The Belimo B349+AFRB24-SR is a factory-assembled characterized control valve with a spring return actuator designed for precise modulating control of hydronic HVAC systems. It combines a 3-way DN 2 inch valve with a 24 V actuator to deliver accurate flow regulation and reliable fail-safe operation.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Control Valves |
| Part Number |
B349+AFRB24-SR |
| Subcategory |
Characterized Control Valves |
| Valve Size |
2 in [50 mm] |
| Valve Type |
3-way mixing/diverting |
| Cv Rating |
46 |
| Fluid Type |
Chilled or hot water, up to 60% glycol |
| Fluid Temperature Range |
-18…120°C [0…250°F] |
| Body Pressure Rating |
400 psi |
| Close-Off Pressure |
200 psi |
| Flow Characteristic |
Equal percentage A-port |
| Leakage Rate |
0% A–AB, <2% B–AB |
| Pipe Connection |
NPT female |
| Nominal Voltage |
AC/DC 24 V |
| Control Signal |
2…10 V (4…20 mA with resistor) |
| Power Consumption (Operation) |
5.5 W |
| Power Consumption (Rest) |
3 W |
| Transformer Sizing |
8.5 VA |
| Position Feedback |
2…10 V |
| Actuator Rotation |
90° |
| Running Time (Motor) |
95 s / 90° |
| Running Time (Fail-Safe) |
<20 s |
| Degree of Protection |
IP54 / NEMA 2 |
| Weight |
10.9 lb |
Information About B349+AFRB24-SR
The B349+AFRB24-SR is part of Belimo’s characterized control valve portfolio engineered to optimize hydronic system efficiency and control accuracy. The valve body is constructed from nickel-plated brass with stainless steel internal components to ensure durability and stable performance under varying pressure and temperature conditions. Its integrated spring return actuator provides proportional control via a 2…10 V signal and ensures automatic return to a defined safety position during power loss. Factory assembly and testing of the valve and actuator reduce installation time while ensuring reliable operation in commercial HVAC applications.
Key Features
- Characterized Three Way Valve Design: Provides precise flow control with equal percentage characteristics on the A-port and optimized B-port flow for stable mixing or diverting operation.
- Integrated Spring Return Actuator: Ensures automatic fail-safe positioning during power loss to protect equipment and maintain system safety.
- High Cv Performance: Cv 46 rating supports efficient flow control for medium to large hydronic circuits with minimal pressure loss.
- Wide Fluid Compatibility: Designed for chilled and hot water systems with glycol concentrations up to 60 percent.
- Modulating Control Capability: Supports 2…10 V control input with optional 4…20 mA configuration for compatibility with modern building automation systems.
- Durable Valve Construction: Nickel-plated brass body with stainless steel and PTFE components ensures long service life and low leakage performance.
- Integrated Position Feedback: Provides a 2…10 V feedback signal for continuous monitoring and closed-loop system control.
The B349+AFRB24-SR delivers the reliability and precision required for accurate hydronic flow modulation and dependable fail-safe valve control in HVAC systems.
