Siemens Building Technology 285-06170 2-1/2" Flanged 3-Way Valve Actuator Assembly with Positioner

The Siemens Building Technology 285-06170 is a complete valve and actuator assembly featuring a 2-1/2-inch flanged, three-way globe valve body paired with a Series 12 actuator and integrated positioner. Designed for commercial and industrial HVAC hydronic systems, this pre-assembled unit delivers precise modulating control of heating and cooling water flow in mixing or diverting applications.

Part of Siemens' Flowrite VF 599 Series, this assembly features a cast iron flanged valve body rated to ANSI 250, making it suitable for demanding building automation and process control installations including air handling units, boilers, chillers, and heat exchangers. The included positioner ensures accurate valve positioning for tight, repeatable control.

Key Features:

• 2-1/2" flanged connection (F×F) for secure, leak-free piping integration
• Three-way mixing/diverting globe valve configuration
• Series 12 actuator included — factory-mounted and pre-wired
• Integrated positioner (W/POS) for precise modulating control
• Cast iron body rated to ANSI 250 pressure class
• Compatible with water and glycol solutions up to 50%
• Medium temperature range: 20°F to 250°F (-7°C to 121°C)
• Equal percentage flow characteristic (N.C. port); Linear (N.O. port)
• Rangeability greater than 100:1
• Designed for use with Siemens building automation and DDC control systems

The 285-06170 ships as a complete, ready-to-install assembly, eliminating field assembly time and ensuring proper actuator-to-valve compatibility. Service flanges are sold separately. This unit is ideal for retrofits and new construction requiring reliable, long-service-life flow control in commercial HVAC hydronic applications.