Description
Siemens Building Technology 257-02011B Pneumatic Valve Assembly Overview
The Siemens 257-02011B is a complete 2-way, normally closed pneumatic valve assembly engineered for reliable flow control in commercial HVAC and building automation systems. Combining a forged brass valve body with a matched pneumatic actuator, this pre-assembled unit simplifies installation and ensures consistent, accurate performance right out of the box.
Valve Body Features
- 2-way, normally closed (NC) configuration for fail-safe operation
- 1/2″ NPT x union male end connections for straightforward piping integration
- 4.0 Cv flow coefficient for precise flow capacity sizing
- Equal percentage flow characteristic for stable, proportional control across the full stroke
- Forged brass body with brass trim for durability and corrosion resistance
- 3–8 PSI spring range on the valve body
Pneumatic Actuator Features
- Factory-matched pneumatic actuator for plug-and-play assembly
- 3–8 PSI spring range actuator, coordinated with the valve body spring range
- Pneumatic signal input drives smooth, responsive valve positioning
- Normally closed design ensures the valve closes upon loss of air signal, providing a safe default state
Applications
- Hydronic heating and cooling coil control in commercial buildings
- Fan coil unit and air handling unit (AHU) water flow regulation
- Building automation and pneumatic control systems
- Two-pipe and four-pipe HVAC distribution systems
Why Choose the Siemens 257-02011B
As a factory-assembled valve and actuator combination, the 257-02011B eliminates field-matching guesswork and reduces installation time. The equal percentage flow characteristic delivers superior controllability at partial load conditions — the most common operating point in commercial HVAC systems. The forged brass body and brass trim provide long service life, while the normally closed fail-safe position protects system equipment during pneumatic signal loss.
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