Coalescing Filters

Part No: EFST170ZN

Core Technical Specifications

Absolute filtration accuracy: Solid particles & liquid oil/water aerosols ≥1 μm

Outlet residual liquid oil content: ≤0.1 mg/m³ (0.1 ppm), fully compliant with ISO 8573-1 Class 3 general industrial compressed air standard

Multi-layer deep-bed imported borosilicate gradient glass fiber composite media, outer thick blue hydrophobic & oleophobic PU drainage foam. Integrated liquid diversion anti-re-entrainment barrier prevents separated liquid oil from being re-carried by high-speed large airflow.

3,500–5,000 working hours / 12 months (whichever comes first) under clean low-dust environments; shorten to 2,000–3,000 hours for spray booth, foundry and high-humidity workshops. Mandatory replacement when differential pressure ΔP ≥ 0.06 MPa.

Differential pressure replacement thresholds

Initial pressure drop of new element: ≤0.012 MPa

Mandatory alarm replacement threshold: ΔP ≥ 0.06 MPa

Sealing & support construction

End cap: Reinforced black PA polymer internal threaded bayonet lock cap with built-in flow diversion channels

Seal system: One-piece full-circle NBR nitrile rubber O-ring, zero air bypass, resistant to compressor oil aging and acidic condensate corrosion

Inner & outer support cage: Single-layer perforated 304 stainless steel mesh, lightweight anti-collapse reinforcement for stable large airflow

Key Product Advantages

First-stage primary coalescing protection to extend service life of downstream precision filters

Installed as the first precision filter after water separator, ZN grade intercepts pipeline bulk condensed water, rust particles and large 1μm liquid oil mist. It drastically reduces liquid contamination load on EFST170XN ultrafine and terminal EFST170XXN activated carbon elements, cuts overall factory spare parts consumption and maintenance frequency.

Large dust & oil holding capacity with stable low differential pressure

Proprietary deep-fold glass fiber matrix stores massive oil sludge, condensate and solid dust without rapid pressure rise, matching non-stop heavy-duty continuous production for large air consumption workshops. Outer blue hydrophobic foam rapidly drains liquid to filter bowl, minimizing oil re-entrainment risk.

Heat-stabilized glass fiber media eliminates fiber shedding and secondary pipeline contamination

High-temperature cured borosilicate glass fiber remains stable within operating temperature range, no softening or pulverization. Zero glass fiber debris enters air piping to block spray guns, industrial laser lenses and proportional solenoid valves.

Low permanent differential pressure design reduces large compressor power consumption

Uniform gradient pore layout maintains minimal airflow resistance throughout full service cycle. Stable low backpressure reduces continuous motor load of large screw air compressors and slashes long-term workshop electricity operating costs.

Working Principle

Pre-dried large-volume compressed air flows through filter cartridge from outside to inside:

Large water droplets and coarse solid impurities are trapped by outer blue hydrophobic foam, drain down to filter bowl by gravity.

1μm oil-water micro-aerosols collide and coalesce into large separable liquid droplets while passing through multi-layer gradient borosilicate glass fiber media.

Outer anti-re-entrainment foam barrier prevents separated liquid oil from being re-carried by high-speed large-volume compressed airflow.

Collected oil and condensate are automatically discharged via electronic zero-loss drain valve.

Medium-clean air with residual liquid oil ≤0.1 mg/m³ flows downstream to EFST170XN ultrafine coalescing filter for secondary high-precision purification.

Application Industries

Full vehicle automotive electrostatic spray production lines, heavy industry large-format laser cutting workshops, large-scale pharmaceutical central aseptic filling air supply, electronics factory large cleanroom main gas source, food & beverage large sterile packaging plants, multi-station heavy automation production lines requiring medium-clean industrial compressed air.