Description
The Belimo B340+AFRB24-SR is a 1.5-inch, 3-way characterized control valve assembly with a factory-fitted 24 V spring return modulating actuator. It provides precise mixing or diverting flow control with a Cv of 37 for hydronic HVAC systems requiring reliable fail-safe operation.
Technical Specifications
| Condition |
New/Never Used Surplus |
| Brand |
Belimo |
| Category |
Control Valves |
| Part Number |
B340+AFRB24-SR |
| Subcategory |
Characterized Control Valves |
| Valve Type |
Characterized Control Valve (CCV) |
| Valve Size |
1.5 in (DN 40) |
| Flow Pattern |
3-way mixing / diverting |
| Cv Rating |
37 |
| Flow Characteristic |
A-port equal percentage, B-port modified |
| Leakage Rate |
0% A–AB, <2% B–AB |
| Body Pressure Rating |
400 psi |
| Close-Off Pressure |
200 psi |
| Pipe Connection |
Female NPT threaded |
| Fluid Compatibility |
Chilled or hot water, up to 60% glycol |
| Fluid Temperature Range |
0…250°F (-18…120°C) |
| Valve Body Material |
Nickel-plated brass |
| Ball Material |
Stainless steel |
| Seat Material |
PTFE |
| Actuator Type |
Spring return, modulating |
| Nominal Voltage |
AC/DC 24 V |
| Control Signal |
2…10 V (4…20 mA with resistor) |
| Power Consumption (Running) |
5.5 W |
| Power Consumption (Rest) |
3 W |
| Running Time |
95 s / 90° |
| Fail-Safe Running Time |
<20 s |
| Degree of Protection |
IP54 / NEMA 2 |
| Weight |
11.0 lb |
Information About B340+AFRB24-SR
The B340+AFRB24-SR is part of Belimo’s characterized control valve range developed to ensure accurate flow control in variable hydronic systems. The 3-way valve design supports both mixing and diverting applications, with optimized port characteristics to maintain stable common port flow. Its factory-mounted AFRB24-SR spring return actuator operates on AC/DC 24 V and provides modulating control with automatic fail-safe positioning during power loss. The assembly is engineered for maintenance-free service, combining durable materials with precise actuator control for long-term reliability.
Key Features
- Three Way Mixing And Diverting Control: Supports both mixing and diverting applications with stable common port flow behavior.
- Characterized Flow Geometry: Equal percentage A-port and modified B-port characteristics ensure smooth modulation and predictable control response.
- Integrated Spring Return Actuator: Automatically drives the valve to a predefined safety position during power loss for system protection.
- Precise Modulating Control Input: Accepts 2…10 V control signals with optional 4…20 mA capability for flexible integration.
- Durable Valve Construction: Nickel-plated brass body and stainless steel internal components provide corrosion resistance and long service life.
- Tight Shutoff Performance: Zero leakage at A–AB and minimal leakage at B–AB ensure effective flow isolation when required.
- Service-Friendly Design: Manual override and mechanical position indication simplify commissioning and maintenance.
The B340+AFRB24-SR delivers the reliability and precision required for accurate three-way flow control with fail-safe operation in commercial HVAC hydronic systems.
