Belimo B231+AFRB24 Valve Assembly

As a technician, you know that hydronic system stability depends on the Belimo B231+AFRB24 Valve Assembly to handle variable flow without the typical hunting issues found in standard globe valves. This 1 1/4" NPT 2-way characterized control valve (CCV) features a specialized stainless steel trim and a unique characterizing disc that ensures a true equal percentage flow characteristic. By combining the high close-off capabilities of a ball valve with the precision of a globe valve, this assembly provides 25 Cv performance ideal for air handling units and fan coil heating or cooling coils. The integrated AFRB24 spring return actuator delivers 180 in-lb of torque, ensuring a reliable fail-safe position during power loss. Operating on 24Vac/Vdc, this on/off control assembly is built for high-demand HVACR environments, supporting chilled or hot water systems with up to 60% glycol. The spring return mechanism and robust stainless steel ball and stem construction provide the mechanical endurance required for critical building automation sequences.

• Equal Percentage Flow: The internal characterizing disc prevents control loop hunting and stabilizes thermal capacity regulation.
• High Close-Off Pressure: Rated for a 200 psi close-off, ensuring tight shut-off in high-pressure hydronic applications.
• Stainless Steel Durability: The stainless steel trim and ball resist corrosion and scaling, extending the service life in variable water conditions.
• Fail-Safe Reliability: The AFRB24 actuator provides a mechanical spring return to the "safe" position in under 20 seconds during power interruptions.
• Simplified Installation: Comes as a complete valve assembly with a direct-coupled actuator, reducing field labor and alignment errors.

Can I use this valve with glycol-based systems?
Yes, the Belimo B231 is compatible with chilled or hot water containing up to 60% glycol concentrations.

What is the purpose of the characterizing disc?
It modifies the natural linear flow of the ball valve into an equal percentage flow characteristic, which is necessary for linear heat transfer in HVAC coils.

How do I change the fail-safe direction?
The fail-safe direction (normally open or normally closed) is determined by the mounting orientation of the AFRB24 actuator on the valve stem.

This item is not eligible for free shipping.

Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.