Belimo B311+LF24-SR-S NPT Control Valve with Actuator - 1/2 3-Way 24V

The Belimo B311+LF24-SR-S is a complete control valve assembly combining a compact 1/2" NPT 3-way brass valve body with an integrated LF24-SR-S spring return actuator. This assembly is designed for precision control in HVAC applications including heating, cooling, and mixing services.

Valve Specifications:

• Port size: 1/2" NPT threaded connections
• Valve configuration: 3-way mixing/diverting
• Flow coefficient (Cv): 1.9
• Body material: Dezincification-resistant brass
• Service: Heating and cooling applications

Actuator Specifications:

• Power supply: 24V AC/DC
• Control signal: 2-10V DC proportional control
• Spring return for fail-safe operation
• Running time: Typically 150 seconds for 90° rotation
• Auxiliary switch included for position indication

The spring return feature ensures the valve automatically returns to its fail-safe position during power loss, providing system protection. The proportional 2-10V control signal allows precise modulation for accurate temperature control. The integrated auxiliary switch provides feedback for building automation systems.