Siemens Building Technology 259-02035 2-Way Normally Open Valve Assembly 1/2" FxUM 1.0 Cv

The Siemens Building Technology 259-02035 is a 2-way normally open valve actuator assembly designed for HVAC terminal unit applications. This assembly features a 1/2-inch connection size with Female NPT x Union Male configuration and a flow coefficient (Cv) of 1.0, making it suitable for precise flow control in hydronic heating and cooling systems.

Key Features:

• 2-way normally open configuration with brass trim for corrosion resistance
• 1/2-inch Female x Union Male (FxUM) NPT connections
• 1.0 Cv flow coefficient for controlled water flow
• Electronic non-spring return actuator for fail-in-place operation
• Designed for terminal unit valve control in commercial HVAC systems
• Operating pressure range: 3 to 8 psi (21 to 55 kPa)
• 24 VAC power supply with floating control signal
• ANSI Class IV leakage rating (0.01% of Cv)

This valve assembly is ideal for zone control applications, fan coil units, and other HVAC systems requiring reliable modulating or two-position control. The normally open design ensures flow continues in the event of power failure, providing safe operation for most heating applications.