Belimo B309B+TFRB24-SR 1/2" 3-Way Control Valve 0.8 Cv with Spring Return Actuator 24V 2-10VDC

The Belimo B309B+TFRB24-SR is a complete control valve assembly combining a 1/2" three-way brass ball valve with a spring return actuator designed for precision HVAC mixing and diverting applications. This compact valve assembly delivers reliable flow control with a 0.8 Cv rating, making it ideal for small zone control, fan coil units, and heating/cooling applications.

Key Features:

• Three-way brass ball valve with 1/2" NPT female threaded connections
• 0.8 Cv flow coefficient for precise flow control
• 24V AC/DC spring return actuator with 22 lb-in (2.5 Nm) torque
• 2-10 VDC modulating control signal for proportional control
• Spring return feature ensures fail-safe positioning during power loss
• Direct mount configuration eliminates additional brackets or hardware
• Compact design saves installation space in tight mechanical rooms
• Durable brass construction provides corrosion resistance and long service life

This valve assembly is designed for use in hydronic heating and cooling systems where modulating control and fail-safe operation are required. The spring return actuator automatically returns the valve to its default position upon power failure, ensuring system safety. The 2-10 VDC control input provides smooth, proportional modulation for precise temperature control and energy efficiency.