Belimo B231+ARX120-3 Valve Assembly

The Belimo B231+ARX120-3 is a high-performance 2-way characterized control valve (CCV) assembly specifically engineered for precise flow regulation in HVAC hydronic systems. This 1 1/4" NPT ball valve features a robust stainless steel trim, comprising a stainless steel ball and stem to resist corrosion and ensure longevity in demanding air handling and fan coil applications. With a flow coefficient (Cv) of 25 and an equal percentage flow characteristic, it provides the stable thermal capacity regulation typically associated with globe valves but in a compact, maintenance-free ball valve design.

The integrated ARX120-3 actuator is a non-spring return (NSR) motor that delivers 180 in-lb of torque. It supports a wide universal input voltage of 100 to 240 Vac and offers on/off or floating point control. Designed for efficiency, the brushless DC motor consumes only 3W during operation and includes electronic overload protection throughout its 90-degree rotation. The NEMA 2 / IP54 rated housing and 1/2" NPT conduit connection make this Belimo valve assembly a standard-setter for reliability in building automation systems (BAS).

Key Benefits

• Equal Percentage Characteristic: A specialized Tefzel characterizing disc prevents hunting and ensures stable control loop performance.
• Zero Leakage: Rated for 0% leakage (Port A to AB), maximizing energy efficiency in chilled and hot water applications.
• High Close-off Pressure: Provides a 200 psi close-off rating, suitable for systems with high differential pressures.
• Simplified Installation: The universal power supply (100-240V) and direct-coupled design reduce field wiring complexity and installation time.
• Maintenance-Free Operation: Features a nickel-plated brass body and lubricated EPDM O-rings for long-term service without manual adjustment.

Common Questions

Can this valve be used with glycol?
Yes, the B231 is suitable for use with water/glycol solutions up to a 60% concentration.

What is the maximum fluid temperature rating?
The assembly is rated for a media temperature range of 0°F to 250°F (-18°C to 120°C).

Does this actuator have a manual override?
Yes, the ARX120-3 features an external push-button manual override for manual positioning during commissioning or power loss.

Is this assembly fail-safe?
No, this is a non-spring return motor. For fail-safe requirements, look for the AFRB or AFRX series actuators.

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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.