Description
The Siemens Building Technology 257-02040 is a complete valve and actuator assembly engineered for precision 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 accurate, repeatable modulation of heating and cooling media in hydronic and pneumatic control applications.
Valve Body
- 2-way, normally open (N/O) configuration
- 1/2″ pipe size with Angle NPT x Union Male end connections
- Flow coefficient (Cv): 2.5
- Equal percentage flow characteristic for precise, stable modulation
- Forged brass body with brass trim for durability and corrosion resistance
Pneumatic Actuator
- Spring range: 3–8 PSI for reliable, fail-safe positioning
- Normally open fail-safe action — valve opens on loss of air signal
- Compatible with standard pneumatic control systems
Key Features & Benefits
- Pre-assembled valve and actuator for simplified installation
- Equal percentage flow characteristic ensures smooth, proportional control across the full stroke
- Forged brass body and brass trim provide long service life in demanding hydronic environments
- Angle body design allows for flexible piping configurations and reduced pressure drop
- Union male connection simplifies field installation and future serviceability
- Designed for use in commercial building automation and HVAC control systems
Specifications
- SKU: 257-02040
- Brand: Siemens Building Technology
- Valve Type: 2-Way, Normally Open
- Pipe Size: 1/2″
- End Connections: Angle NPT x Union Male
- Flow Coefficient (Cv): 2.5
- Flow Characteristic: Equal Percentage
- Body Material: Forged Brass
- Trim Material: Brass
- Actuator Type: Pneumatic
- Spring Range: 3–8 PSI
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