Description
The Siemens Building Technology 257-02041 is a complete valve and actuator assembly engineered for precise flow control in commercial HVAC hydronic and pneumatic control systems. Combining a forged brass body valve with an integrated pneumatic actuator, this assembly delivers reliable, repeatable performance in demanding building automation applications.
Valve Configuration
- 2-way, normally open (N/O) configuration
- 1/2″ NPT end connections for straightforward pipe installation
- 4.0 Cv flow coefficient for accurate flow capacity sizing
- Equal percentage flow characteristic for stable, linear control response across the full operating range
- Forged brass body with brass trim for corrosion resistance and long service life
Pneumatic Actuator
- 3–8 PSI spring range for direct integration with standard pneumatic control systems
- Spring-return design ensures fail-safe normally open position on loss of air pressure
- Compatible with standard pneumatic branch line signals from building automation controllers
Applications
- Hydronic heating and cooling coil control
- Fan coil unit and air handling unit water-side modulation
- Commercial building automation and DDC/pneumatic hybrid systems
- Chilled water and hot water distribution control
Key Benefits
- Factory-assembled valve and actuator — ready to install, no field assembly required
- Equal percentage characteristic provides superior controllability at partial load conditions
- Forged brass construction withstands system pressures and temperatures typical of HVAC hydronic applications
- Siemens Building Technology quality ensures compatibility with Siemens pneumatic control systems
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