Coalescing Filters

Model: PD390

Core Technical Specifications

Filter Grade: PD High-efficiency Superfine Coalescing Filtration

Filtration Precision: 0.01 μm submicron oil mist & micro solid particles

Residual Oil Content at Outlet: ≤0.01 ppm under rated airflow

Filter Media: Imported HV multi-layer gradient borosilicate micro glass fiber with permanent hydrophobic & oleophobic coating

Max Working Pressure: 16 bar / 232 PSIG

Max Continuous Operating Temperature: ≤66℃

Key Product Features

Deep Polishing Ultra-Fine Oil Mist Removal

Installed after DD390 coarse pre-filter, this cartridge captures invisible trace submicron oil aerosols and tiny residual condensed water droplets that coarse-grade filters cannot fully intercept. It delivers nearly oil-free compressed air and significantly slows saturation of downstream QD390 activated carbon filter elements to extend their overall service cycle.

Low Pressure Drop & Energy Saving

Deep-pleated proprietary glass fiber media maximizes effective filtration area remarkably. It maintains stable low airflow resistance under 24-hour full-load continuous operation, reduces extra power consumption of air compressors and cuts overall factory air supply operating costs.

Large Dirt & Oil Holding Capacity

Multi-gradient layered depth filtration structure stores massive separated lubricating oil, condensed water and micro solid contaminants, extending maintenance intervals and minimizing production downtime during filter replacement.

Heavy-Duty Stainless Steel Reinforced Support Cage

Dual stainless steel mesh cages resist strong high-speed airflow impact under heavy-duty industrial conditions, preventing filter media collapse, deformation and fiber shedding to eliminate secondary fiber contamination of clean compressed air.

Working Principle

Compressed air pre-treated by DD390 coarse filter enters the cartridge from the outer stainless steel protective mesh. Multi-layer ultra-fine glass fiber captures 0.01 μm submicron oil mist particles; tiny oil droplets continuously collide and coalesce into large liquid condensate, which sinks to the filter housing bottom and drains automatically by gravity. Ultra-clean low-oil compressed air is delivered to QD activated carbon filters or high-precision terminal production equipment.

Application & Industries

Core ultra-precision polishing filter for medium-flow industrial compressed air post-processing systems, installed between coarse pre-filters and activated carbon filters.

Widely applied in precision electronic assembly, pharmaceutical aseptic manufacturing, food sterile packaging, medical equipment processing, optical coating, laboratory analytical instruments, automotive topcoat spraying, laser cutting and factory centralized air supply systems requiring Class 1 ultra-clean oil-free compressed air.