Description
Siemens 257-02039 Two-Way Normally Open Pneumatic Valve Assembly
The Siemens 257-02039 is a precision-engineered two-way, normally open valve assembly designed for demanding HVAC hydronic and building automation applications. Featuring a forged brass body with brass trim, this valve delivers reliable flow control and long-term durability in commercial mechanical systems. The integrated 3–8 PSI spring range pneumatic actuator provides dependable, air-operated modulation without the need for additional control power.
Key Features
- Two-way, normally open (N/O) valve configuration
- 1/2″ NPT x union male end connections for easy installation and serviceability
- 2.5 Cv flow coefficient with equal percentage flow characteristic for precise modulation
- Forged brass body construction for superior strength and corrosion resistance
- Brass trim for compatibility with a wide range of hydronic fluids
- Integrated pneumatic actuator with 3–8 PSI spring range
- Normally open fail-safe position ensures system safety on air loss
- Compact assembly design simplifies installation in tight mechanical spaces
Application
The 257-02039 is ideally suited for use in commercial HVAC systems including chilled water coil control, hot water heating coils, and other hydronic terminal unit applications where pneumatic control is employed. The equal percentage flow characteristic provides stable control across a wide range of load conditions, making it well-suited for variable-flow hydronic systems.
Specifications
- SKU: 257-02039
- Brand: Siemens Building Technology
- Valve Type: 2-Way, Normally Open
- Connection Size: 1/2″
- Connection Type: 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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