Belimo B318+LF24-3 Valve Assembly

The Belimo B318+LF24-3 is a precision-engineered 3-way characterising control valve assembly designed for demanding hydronic HVAC applications. This 3/4 inch NPT assembly features a stainless steel trim and ball, ensuring durability and resistance against scale buildup in open or closed loops. With a Cv of 7.4, it provides linear flow characteristics for stable modulating control. The unit is paired with the LF24-3 spring return actuator, delivering 35 in-lb of torque to ensure reliable fail-safe operation during power loss. Operating on 24VAC/DC, this floating point control valve is ideal for air handling units and VAV reheat coils. The integrated Belimo CCV technology eliminates the need for peripheral balancing valves, maintaining constant flow regardless of pressure fluctuations. Contractors value this assembly for its NEMA 2 rated housing and low power consumption, making it a standard for commercial HVAC control systems and hydronic heating cooling builds.

Key Benefits

• Fail-Safe Reliability: The mechanical spring return ensures the valve returns to its safety position during power interruptions.
• Reduced Maintenance: The stainless steel ball and stem prevent corrosion and clogging common in brass-trimmed alternatives.
• Precision Throttling: A specialized characterizing disc provides equal percentage flow, preventing hunting in modulating control loops.
• Simplified Installation: The direct-coupled design allows for quick mounting without specialized tools or linkages.

Common Questions

What is the runtime for the LF24-3 actuator?
The motor typically operates at 150 seconds for 95 degrees of travel, while the mechanical spring return closes the valve in less than 25 seconds upon power loss.

Can this valve be used in steam applications?
No, the Belimo B318 series is specifically rated for chilled or hot water and glycol solutions up to 60%; it is not designed for steam service.

Does this assembly support proportional 0-10V signals?
The LF24-3 is a floating point (three-point) actuator. For 0-10VDC or 4-20mA modulation, you would require the LF24-SR model.

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.