Belimo B211B+TFRB24 Valve Assembly

The Belimo B211B+TFRB24 is a precision-engineered 1/2-inch 2-way characterised control valve (CCV) and spring return actuator assembly, designed for reliable flow control in closed-loop HVAC systems. Featuring a Cv of 1.9 and a forged brass body with a chrome-plated brass ball, this NPT valve assembly utilizes a patented characterising disc to provide a true equal percentage flow characteristic. This ensures linear heat output and prevents hunting in air handlers and fan coil units. The paired TFRB24 actuator delivers 22 in-lb of torque and operates on 24VAC/DC, providing fail-safe on/off control to protect coils during power loss. The spring return fail-safe mechanism is critical for cold-weather applications where freeze protection is a primary concern. With its IP42 enclosure and low power consumption during hold, this assembly allows for efficient multi-unit wiring on a single transformer, making it a standard-issue solution for contractors requiring tight shut-off and long-term hydronic stability.

• Equal Percentage Flow: Integrated characterising disc ensures stable control and eliminates thermal hunting.
• Fail-Safe Operation: Reliable mechanical spring return provides positive shut-off during power interruptions.
• Direct Mount Design: Simplified installation with no linkage required, reducing labor time and mechanical play.
• Zero Leakage: Rated for bubble-tight shut-off (ANSI Class VI) to improve energy efficiency in hydronic circuits.
• Compact Footprint: Ideal for tight mechanical spaces in fan coil units and unit ventilators.

Is the Belimo B211B+TFRB24 suitable for steam applications?
No, this CCV assembly is designed specifically for chilled or hot water and glycol solutions up to 60% concentration. It should not be used in steam systems.

Can I change the fail-safe direction (Normally Open vs. Normally Closed)?
The fail-safe direction is determined by how the actuator is mounted to the valve stem. You can switch between spring-return open or spring-return closed by flipping the actuator orientation.

What is the maximum operating pressure for this 1/2-inch NPT valve?
The B211B series typically supports a maximum body pressure of 600 psi, with a close-off pressure rating of 200 psi.

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.