Description
The Siemens Building Technology 257-02038 is a factory-assembled, two-way normally open control valve engineered for precise hydronic and HVAC flow regulation in commercial building automation systems. Combining a high-quality forged brass body with brass trim and a direct-coupled pneumatic actuator, this valve assembly delivers reliable, repeatable performance in demanding building control applications.
Valve Body Features
- 2-Way, Normally Open (N/O) configuration
- 1/2″ NPT end connections for straightforward pipe installation
- 2.5 Cv flow coefficient for accurate flow capacity sizing
- Equal percentage flow characteristic for stable, proportional control across the full stroke
- Forged brass body construction for durability and corrosion resistance
- Brass trim for compatibility with chilled water, hot water, and steam applications
Pneumatic Actuator Features
- Factory-mounted pneumatic actuator for a ready-to-install valve assembly
- 3–8 PSI spring range for direct integration with standard pneumatic control systems
- Normally open fail-safe position ensures system safety on loss of air signal
Application Highlights
- Ideal for commercial HVAC hydronic systems, fan coil units, air handling units, and terminal equipment
- Compatible with pneumatic building automation and DDC control systems
- Compact, pre-assembled design reduces installation time and labor
- Siemens Building Technology quality assurance for long service life
The Siemens 257-02038 valve assembly is a dependable solution for contractors and building engineers who require precise pneumatic control in hydronic HVAC systems. Its equal percentage flow characteristic ensures excellent controllability at partial loads, making it well suited for variable-flow heating and cooling applications.
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