Siemens Building Technology 259-02000 Normally Closed Valve Assembly Cv HVAC Control Valves & Actuators - 2-Way 1/2-Inch 0.4

The Siemens Building Technology 259-02000 is a 2-way normally closed valve assembly designed for precise control in HVAC and building automation systems. This compact valve features a 1/2-inch line size with a flow coefficient (Cv) of 0.4, making it ideal for small-capacity applications requiring accurate flow modulation.

Key Features:

• Normally closed (N/C) configuration for fail-safe operation
• 0.4 Cv flow coefficient for precise flow control
• Female by female (FxF) pipe connections for easy installation
• Durable brass trim construction for corrosion resistance
• Electronic actuator with fail-in-place functionality
• Floating control operation for proportional modulation
• Compatible with SSC81U electronic actuator

This valve assembly is commonly used in chilled water systems, hot water heating applications, and general HVAC control circuits where reliable, proportional flow control is required. The fail-in-place actuator maintains the valve position during power loss, providing system stability and safety. The brass trim ensures long-lasting performance in both potable water and glycol-based systems.