Coalescing Filters

Model: DDP520F

Core Technical Specifications

Filtration Grade: F Grade Primary Coarse Filtration

Filtration Precision: 1 μm solid particles, bulk condensed water & large oil droplets

Residual Oil Mist at Outlet: ≤0.5 ppm under rated airflow

Filter Media: Multi-layer gradient borosilicate micro glass fiber composite with hydrophobic & oleophobic coating

Max Working Pressure: 16 bar / 232 PSIG

Max Continuous Operating Temperature: ≤80°C

Service Life: 4000 working hours or 12 months, whichever comes first

Airflow Direction: Outside-to-Inside

End Cap & Sealing: Integrated reinforced plastic upper & lower end caps with built-in NBR O-ring seal

Support Frame: Double-layer perforated anti-corrosion plastic inner & outer protective cage

Key Product Features

Frontline System Protection

As the first defensive barrier of compressed air purification system, it intercepts pipeline rust, scale, industrial dust, massive condensate and bulky oil droplets. It effectively reduces pollutant load on downstream medium coalescing, superfine and activated carbon filter elements, extends their service life and prevents premature saturation of refrigerated dryer desiccant.

Low Pressure Drop & Energy Efficient

Deep-pleated glass fiber media maximizes effective filtration area. Stable low airflow resistance is maintained under 24-hour full-load continuous operation, cutting extra power consumption of air compressors and lowering overall factory air supply operation costs.

Large Dirt & Liquid Holding Capacity

Multi-gradient layered depth filtration structure stores massive separated lubricant, condensed water and solid contaminants, prolonging maintenance cycles and minimizing production downtime for filter replacement.

Impact Resistant Reinforced Support Frame

Dual plastic protective cages resist high-speed airflow impact, preventing filter media collapse, deformation and fiber shedding to avoid secondary fiber contamination of clean compressed air.

Direct OEM Interchangeability

Strict original dimensional tolerance matching corresponding DDP series filter housings. No air bypass leakage under frequent pressure fluctuations. Plug-and-play structure allows fast disassembly and installation without housing modification.

Working Principle

Raw unpurified compressed air flows into the cartridge from the outer protective frame. The outer coarse fiber layer traps large solid particles, liquid water and large oil droplets. Minor oil mist is coalesced into heavy liquid condensate, which sinks to the housing bottom and drains automatically by gravity. Primarily purified compressed air flows to the secondary medium coalescing filter for further oil removal.

Application & Industries

First-stage protective pre-filter for medium-flow compressed air post-processing systems, installed upstream of medium coalescing filters and refrigerated air dryers.

Widely used in machinery manufacturing, automotive production lines, packaging printing, textile factories, general industrial spraying, pneumatic tool stations, food primary processing, medium laser cutting and factory centralized air supply systems.