Description
The Siemens Building Technology 257-02045 is a complete valve and actuator assembly engineered for reliable flow control in commercial HVAC and building automation systems. Featuring a 2-way, normally open configuration with an equal percentage flow characteristic, this assembly delivers precise, repeatable modulation to maintain optimal system performance.
Valve Body
- 2-way, normally open (N/O) configuration
- 3/4″ NPT x union male end connections for easy installation and serviceability
- Flow coefficient (Cv): 6.3 — suitable for moderate flow applications
- Equal percentage flow characteristic for accurate proportional control
- Forged brass body construction for durability and corrosion resistance
- Brass trim for compatibility with hydronic and water-based systems
Pneumatic Actuator
- Spring range: 3–8 PSI for direct integration with pneumatic control systems
- Normally open fail-safe operation — valve opens on loss of air pressure
- Designed for use with standard pneumatic control signals
Applications
- Commercial HVAC hydronic heating and cooling systems
- Building automation and pneumatic control systems
- Air handling units, fan coil units, and terminal equipment
- Hot water and chilled water coil control
Why Choose Siemens 257-02045?
Siemens Building Technology is a trusted name in commercial HVAC controls and valve assemblies. The 257-02045 combines a robust forged brass valve body with a factory-matched pneumatic actuator, ensuring seamless integration and long-term reliability. The union male end connections simplify field installation and future maintenance, while the equal percentage flow characteristic provides superior control linearity across the full operating range.
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