Siemens Building Technology 908-051 Filter

The Siemens Building Technology 908-051 Filter is a high-capacity, single-housing oil removal filter designed to maintain air quality in pneumatic control systems and HVACR air stations. As a specialized Hankison coalescing filter, this unit is the engineered direct replacement for legacy dual-filter configurations including the K-337 and K-337-1. Unlike the older two-stage sequences, the 908-051 optimizes the filtration process into a single large-form factor, utilizing a high-efficiency coalescing filter element to trap oil aerosols and moisture before they reach sensitive downstream components like BAS controllers and actuators.

This 908-051 filter assembly features a robust 10 scfm flow capacity and is rated for a maximum operating pressure of 150 psig. The 3/8-inch NPT female connections ensure a secure fit within standard air line architectures. Designed for the removal of particulate matter and liquid contaminants down to 0.0025 particle size, it effectively prevents the oil fouling often seen in aged pneumatic lines. The integrated drain port allows for easy bulk liquid removal, while the replaceable cartridge design enables maintenance without disconnecting the main piping assembly, ensuring long-term system reliability in demanding industrial air treatment applications.

• Streamlined Retrofitting: Replaces the dual-cartridge K-337 pneumatic filter series with a single, simplified housing for faster installation and fewer leak points.
• High-Precision Filtration: Achieves superior air purity by removing oil and water contaminants down to 0.0025 microns, protecting sensitive pneumatic thermostats and valves.
• Optimized Pressure Management: Supports up to 150 psig, making it suitable for standard and high-pressure compressed air station equipment.
• Simplified Maintenance: Features a manual drain valve and 1/8-turn bowl removal for rapid filter element replacement without system teardown.

Can I use this to replace the older K-337-1 dual filter setup?
Yes. The 908-051 is the direct OEM single-filter replacement for the K-337 and K-337-1 sequences. It provides the same filtration efficiency in a more efficient single-housing footprint.

When should the internal filter element be replaced?
For peak performance in pneumatic control systems, it is recommended to replace the element (part 908-052) when the pressure drop across the filter reaches 10 psi or during your annual preventative maintenance cycle.

Where is the best installation point for this filter?
For maximum service life, install the 908-051 downstream of refrigerated air dryers or upstream of desiccant dryers to prevent oil coating that can lead to dryer failure.

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Disclaimer: While we strive for 100% accuracy, product data and specifications are subject to change. Please contact our team to confirm compatibility or technical details before purchasing.