Belimo B309B+LF24-SR-S Bronze Control Valve with Actuator - 1/2 3-Way

The Belimo B309B+LF24-SR-S is a compact 3-way control valve assembly designed for precise flow control in HVAC applications. This unit combines a 1/2" bronze valve body with an integrated 24V spring return actuator, providing reliable modulating control for heating and cooling systems.

Key Specifications:

• Valve size: 1/2" NPT threaded connections
• Flow coefficient (Cv): 0.8
• Valve configuration: 3-way mixing/diverting
• Valve body material: Bronze construction for durability
• Actuator voltage: 24V AC/DC
• Control signal: 2-10V DC proportional control
• Spring return feature for fail-safe operation
• Auxiliary switch for position feedback

Features and Benefits:

• Proportional control allows precise modulation of water flow in hydronic systems
• Spring return functionality ensures valve returns to fail-safe position on power loss
• Compact integrated design reduces installation time and space requirements
• Bronze valve body provides excellent corrosion resistance
• Auxiliary switch enables system monitoring and status feedback
• Suitable for both heating and cooling applications

This valve assembly is ideal for use in fan coil units, unit heaters, radiant heating systems, and other small-capacity HVAC applications requiring accurate temperature control. The 2-10V control input makes it compatible with most modern building automation systems and DDC controllers.