Description
The Siemens Building Technology 257-02043 is a precision-engineered 2-way normally open valve assembly designed for demanding HVAC hydronic and pneumatic control applications. Combining a forged brass valve body with a factory-matched pneumatic actuator, this assembly delivers reliable, repeatable flow modulation in commercial building automation systems.
Valve Configuration
- 2-way, normally open (NO) configuration
- 1/2″ angle 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 precise, stable modulation across the full stroke
Construction & Materials
- Forged brass body for superior strength and corrosion resistance
- Brass trim components for long-term durability in hydronic service
- Angle-pattern body design minimizes pressure drop and simplifies piping layout
- Union male connection allows quick removal and reinstallation without cutting pipe
Pneumatic Actuator
- Factory-mounted pneumatic actuator for a complete, ready-to-install assembly
- 3–8 PSI spring range for compatibility with standard pneumatic control signals
- Spring-return action ensures fail-safe normally open position on loss of air pressure
- Designed for integration with pneumatic building automation and DDC control systems
Typical Applications
- Chilled water and hot water coil control in AHUs and fan coil units
- Commercial HVAC hydronic systems with pneumatic controls
- Building automation systems requiring modulating 2-way valve control
- Retrofit and replacement of existing pneumatic valve assemblies
The Siemens 257-02043 valve assembly is a trusted solution for contractors and building engineers who require a reliable, factory-matched pneumatic valve and actuator combination. Its forged brass construction and equal percentage flow characteristic make it well-suited for precise temperature and flow control in commercial HVAC environments.
Reviews
There are no reviews yet.