Belimo B307+LF120-S 1/2" 3-Way Stainless Steel Control Valve with LF120-S Actuator

The Belimo B307+LF120-S is a compact 1/2-inch three-way control valve assembly designed for hydronic HVAC applications requiring precise flow control and reliable performance. This factory-assembled valve package combines a stainless steel valve body with a spring return electric actuator for fail-safe operation.

Valve Specifications:

• Valve size: 1/2 inch (DN15) with NPT threaded connections
• Flow coefficient (Cv): 0.3 for precise flow control in small capacity systems
• Three-way mixing/diverting configuration for heating or cooling applications
• Stainless steel trim for durability and corrosion resistance
• Close-off rating suitable for zone control and low-pressure applications

LF120-S Actuator Features:

• 120V AC power supply for standard North American electrical systems
• On/off (2-position) control with spring return to fail-safe position
• Spring return functionality ensures valve returns to default position on power loss
• Compact low-profile design minimizes installation space requirements
• Direct-mounted actuator eliminates need for field assembly and linkage adjustment
• Auxiliary switch included for monitoring valve position or interlocking controls

This valve assembly is ideal for small-capacity hydronic systems including fan coil units, unit heaters, convectors, and radiant heating/cooling zones where reliable two-position control is required. The spring return feature makes it particularly well-suited for safety applications and systems requiring a defined fail-safe position during power interruptions.