Belimo B250+AFRX24-MFT Valve Assembly

The Belimo B250+AFRX24-MFT Valve Assembly is a high-performance 2-way characterized control valve (CCV) designed for precise flow control in hydronic systems. This 2-inch NPT valve features a stainless steel trim and a 57 Cv rating, ensuring durability against corrosive media and high differential pressures. Paired with the AFRX24-MFT spring-return actuator, the assembly provides 180 in-lb of torque and failsafe reliability. The Multi-Function Technology (MFT) allows for versatile control inputs including 4-20mA (500 Ohm), PWM (1500 Ohm), floating point, and On/Off signals. Operating on 24Vac/Vdc, this proportional control valve is engineered for air handling units and large terminal equipment where tight shut-off and characterized flow are required to maintain loop stability. The spring return fail-safe mechanism ensures the system defaults to a known position during power loss, protecting critical infrastructure from temperature swings or freezing.

Key Features and Specifications

• Flow Coefficient: 57 Cv for high-capacity fluid handling.
• Construction: Forged brass body with 316 stainless steel ball and stem for extended service life.
• Actuation: AFRX24-MFT spring-return actuator providing 180 in-lb (20 Nm) torque.
• Signal Versatility: Supports MFT parameters for customized 2-10Vdc, 4-20mA, or pulse width modulation.
• Connection: 2-inch female NPT threads for standard piping integration.
• Seal Integrity: Teflon (PTFE) seats with EPDM O-rings for zero percent leakage.

Common Questions

How do I configure the MFT actuator for a 4-20mA signal?
The AFRX24-MFT is pre-configured for 2-10Vdc but can be field-adjusted or factory-programmed using a 500 Ohm resistor for 4-20mA current loops or via the Belimo PC-Tool.

Is this valve suitable for high-pressure steam applications?
No, this CCV assembly is designed for chilled or hot water and 60% glycol solutions. It is not rated for steam service.

Does the assembly include the linkage?
Yes, the B250+AFRX24-MFT comes as a fully assembled unit with the valve, actuator, and necessary mounting hardware for immediate installation.

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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.