Belimo B313B+LF24-SR Valve Assembly

The Belimo B313B+LF24-SR is a professional-grade 3-way characterized control valve (CCV) assembly designed for precise modulating control in high-performance hydronic systems. Integrating a 1/2" NPT forged brass valve body with a Cv 4.7 rating, this unit is engineered for heating and cooling coils in air handling units and fan coil systems. The assembly features a chrome-plated brass ball and a specialized Tefzel characterized disc, ensuring an equal percentage flow characteristic that maintains linear heat output and prevents hunting in the control loop. This valve is rated for a 600 psi body pressure and can handle media temperatures from 0°F to 250°F.

For reliable actuation, the LF24-SR spring return actuator provides 35 in-lb of torque and operates on 24VAC/DC. It responds to a 2-10VDC modulating control signal, offering a proportional response to the building automation system (BAS). The brushless DC motor technology ensures long-term reliability and precise positioning, while the fail-safe spring return mechanism guarantees the valve returns to its designated safety position upon loss of power. The unit includes a 3-foot appliance cable and a 1/2" NPT conduit connection for streamlined field installation.

• Precision Flow Control: The characterizing disc provides an equal percentage flow, essential for stabilizing temperature control in variable flow systems.
• Zero Leakage: High-quality EPDM O-rings and PTFE seats ensure a bubble-tight shut-off on Port A, reducing energy waste.
• Fail-Safe Reliability: The mechanical spring return actuator ensures a predictable fail position during power interruptions.
• Hydronic Versatility: Suitable for chilled or hot water applications with up to 60% glycol concentration.
• Simplified Commissioning: Standard 2-10VDC feedback allows the controller to verify actual valve position in real-time.

• What is the maximum close-off pressure for this assembly? The Belimo B313B is rated for a maximum close-off pressure of 200 psi.
• Can I use a 4-20mA signal with this actuator? Yes, by adding a 500-ohm resistor, the LF24-SR can be adapted to accept a 4-20mA analog input.
• Is this valve suitable for steam applications? No, this CCV assembly is designed specifically for water and glycol-based hydronic systems, not for high-pressure steam.

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.