Belimo B339+AFRB24-SR Valve Assembly

The Belimo B339+AFRB24-SR is a professional-grade 3-way characterized control valve (CCV) assembly designed for precise hydronic control in high-demand HVACR systems. This 1-1/2" NPT assembly features a stainless steel ball and stem to ensure long-term reliability and resistance to scaling in chilled or hot water applications. With a Cv of 29 and an equal percentage flow characteristic in the A-port, it provides superior linear control for air handling units and fan coil coils. The factory-mounted AFRB24-SR spring return actuator delivers 180 in-lb of torque and operates on a 24VAC/DC power supply, utilizing a 2-10 VDC modulating control signal (proportional) to maintain exact setpoints. In the event of power loss, the integrated mechanical spring return ensures the valve moves to a fail-safe position, protecting critical equipment from overflow or freezing temperatures. Built with a nickel-plated brass body and rated for 400 psi, this assembly is engineered for seamless integration into modern building automation systems (BAS).

Key Benefits

• Optimized Flow Control: High 29 Cv rating with specialized A-port equal percentage flow for stable temperature regulation.
• Rugged Durability: Stainless steel trim and ball prevent corrosion and ensure 0% leakage (Port A to AB) even in glycol-rich systems (up to 60%).
• Fail-Safe Protection: Reliable mechanical spring return actuator provides essential safety by returning the valve to its original position during power failures.
• Technical Versatility: Direct-coupled design supports 2-10 VDC modulating signals, making it compatible with most HVAC 24V controllers.

Common Questions

What is the maximum operating pressure for this valve?
The valve body is rated for a 400 psi body pressure and can handle a close-off pressure of up to 200 psi.

Can I use this assembly with 4-20 mA control signals?
Yes, the AFRB24-SR actuator can be adapted for 4-20 mA control using an external 500-ohm resistor (ZG-R01).

Is this valve suitable for steam applications?
No, this CCV assembly is specifically designed for chilled and hot water or up to 60% glycol solutions with a fluid temperature range of 0°F to 250°F.

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.