Coalescing Filters

Part No: 2901200404

Core Technical Specifications

Filtration Grade: PDp Primary Coarse Dust & Bulk Liquid Prefilter

Absolute Filtration Precision: Solid particles ≥3 μm, bulk free water droplets

Filtration Efficiency: 99.9% capture efficiency for 3μm pipeline rust, welding slag and dust contaminants

Filter Media Structure: Multi-layer gradient deep-pleated cellulose-glass fiber composite, thick white outer porous foam for capturing large water droplets and coarse solid impurities

Sealing & Support Construction

End Cap Assembly: Reinforced black PA polyamide lock base with built-in flow diversion ribs

Seal System: Single full-circle NBR nitrile rubber O-ring, zero air bypass leakage, resistant to compressor oil and acidic condensate aging

Inner & Outer Support Cage: Double-layer perforated 304 stainless steel mesh, anti-collapse under full rated continuous airflow

Key Product Advantages

First-stage front protective barrier to extend service life of all downstream precision filter cartridges

Installed at the very front of the four-stage purification system, this PDp70+ prefilter intercepts pipeline rust, welding debris, sand dust and massive free condensed water before they reach DD, PD and QD grade fine filters. It dramatically reduces particle and liquid load on subsequent coalescing and carbon elements, cutting overall factory spare parts and maintenance costs.

High dust & liquid holding capacity with slow pressure rise

Thickened composite fiber plus outer thick white foam dual interception design delivers massive dust storage and liquid drainage capacity. Even in humid, dusty production environments, it avoids rapid differential pressure buildup and frequent premature replacement downtime.

Stable solidified media structure with zero fiber shedding secondary contamination

Heat-set composite fiber matched with double-layer stainless steel support mesh prevents fiber powder detachment into pipelines, protecting downstream spray guns, laser optical lenses and precision miniature pneumatic valves from blockage failure.

Ultra-low initial pressure drop to cut compressor energy consumption

Optimized pleat spacing and uniform pore distribution minimize startup airflow resistance. Stable low backpressure reduces continuous power loss of small/medium screw air compressors, lowering long-term factory electricity operating expenses.

Working Principle

Large solid dust, rust particles and bulk water droplets are first trapped by the outer white foam layer; most free water drains down to filter bowl via gravity;

Remaining fine dust and micro water droplets are intercepted by multi-layer deep-pleated composite fiber media;

Primarily cleaned air flows downstream into DD70+ medium coalescing filter for secondary oil-water separation treatment;

Accumulated condensate inside filter bowl is automatically discharged via Atlas Copco EWD electronic auto drain valve.

Application Industries

Small metal machining workshops, mini laser marking & cutting equipment, textile printing auxiliary air supply, small packaging automation lines, standalone small screw compressor stations, plastic injection molding auxiliary air supply, small food aseptic packaging equipment, general pneumatic tool gas source for small manufacturing plants.