Belimo B318B+LF120-S Brass Ball Valve with On/Off Actuator - 3/4 3-Way

The Belimo B318B+LF120-S is a complete valve and actuator assembly featuring a 3/4-inch three-way brass ball valve paired with an LF120-S spring return electric actuator. This packaged solution is designed for HVAC mixing and diverting applications requiring reliable on/off control.

Key Specifications:

• Valve size: 3/4 inch (DN20) with NPT threaded connections
• Flow coefficient (Cv): 7.4 for optimal flow control
• Three-way configuration for mixing or diverting service
• Lead-free brass construction for potable water compliance
• Spring return actuator for fail-safe operation
• 120VAC power supply with on/off (2-position) control
• Auxiliary switch for position indication or interlock applications
• Quick-mount direct coupling for easy installation

The LF120-S actuator provides 75 lb-in (8.5 Nm) of torque with a spring return feature that automatically returns the valve to its fail-safe position upon power loss. The integrated auxiliary switch enables remote monitoring of valve position or integration with building automation systems. This assembly is ideal for chilled water systems, hot water heating loops, and hydronic zoning applications in commercial and institutional buildings.