Siemens Building Technology 259-02011 2-Way Normally Closed Valve Assembly 1/2" FxUM Brass 4.0 Cv

The Siemens Building Technology 259-02011 is a 2-way, normally closed (N/C) valve and actuator assembly designed for precise hydronic flow control in commercial HVAC and building automation systems. Featuring a 1/2-inch Female × Union Male (FxUM) connection configuration and a 4.0 Cv flow coefficient, this assembly provides reliable modulating or on/off control of heating and cooling water circuits.

Part of Siemens' proven Powermite 599 MT Series, this valve assembly integrates a brass-trim globe valve body with an electronic actuator. The normally closed (N/C) fail-safe position ensures the valve defaults to closed in the event of a power loss, protecting the system from unintended flow.

Key Features:

• Configuration: 2-Way, Normally Closed (N/C)
• Line Size: 1/2 inch
• Flow Coefficient: 4.0 Cv
• Connection Type: Female × Union Male (FxUM)
• Trim Material: Brass
• Actuator Type: Electronic, 24 VAC
• Fail-Safe Position: Fail-in-Place
• Control Mode: Floating (3-point)
• Valve Body Series: Powermite 599 MT Series

The 259-02011 is well-suited for terminal unit applications including fan coil units, unit ventilators, and zone valves in commercial building automation and direct digital control (DDC) systems. The union male outlet simplifies installation and maintenance in tight mechanical spaces.