Description
Overview
The Siemens Building Technology 257-02042 is a complete 2-way, normally open valve assembly engineered for precise hydronic and HVAC flow control. Combining a forged brass valve body with a pneumatically operated actuator, this assembly delivers reliable modulating performance in commercial building automation systems.
Valve Features
- 2-way, normally open (N/O) configuration for fail-safe operation
- 1/2″ NPT x Union Male end connections for easy installation and serviceability
- 4.0 Cv flow coefficient for accurate flow capacity sizing
- Equal percentage flow characteristic for stable, linear control response across the full valve stroke
- Forged brass body with brass trim for durability and corrosion resistance
Pneumatic Actuator Specifications
- 3–8 PSI spring range for direct integration with standard pneumatic control systems
- Spring-return design ensures normally open fail-safe positioning on loss of air pressure
- Compatible with standard building automation pneumatic control signals
Applications
- Hydronic heating and cooling coil control
- Fan coil unit (FCU) and air handling unit (AHU) water-side control
- Commercial building automation and DDC/pneumatic hybrid systems
- Chilled water and hot water distribution systems
Why Choose Siemens 257-02042
Siemens Building Technology products are trusted throughout the commercial HVAC industry for precision, longevity, and seamless integration with building management systems. The forged brass body and brass trim construction of the 257-02042 ensure long service life even in demanding hydronic applications, while the equal percentage flow characteristic provides the fine-tuned modulation needed for energy-efficient system operation.
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