High Precision FAUDI MIL.4-559 Coalescing Filter Replacement | Full Series In Stock

LEFILTER manufactures premium drop-in replacement filter for FAUDI MIL.4-559 coalescing element. Complying with EI 1581 6th Edition aviation filtration standards, this MIL-series coalescer is engineered for high-efficiency water separation and fine particle removal in jet fuel, diesel and light hydrocarbon fluids. Every dimension, sealing interface and flow characteristic is precisely matched to original FAUDI specifications, enabling direct plug-and-play installation without vessel modification. With upgraded hydrophilic gradient fiber media and fatigue-resistant structure, our MIL.4-559 replacement delivers consistent purification performance, helping users cut down high OEM costs and resolve long lead-time issues.

FAUDI MIL.4-559 is a widely used medium-flow coalescing element designed for standard fuel water separator systems. It effectively tackles common fluid contamination problems such as emulsified water, oil mist and micro solid particles, which easily cause fuel quality degradation, pipeline corrosion and downstream instrument failure. LEFILTER’s optimized MIL.4-559 filter adopts balanced density fiber layout, maintaining stable coalescing efficiency under pressure cycling and continuous variable-flow working conditions, ideal for long-term operation of aviation fuel terminals and petrochemical processing systems.

Coalescing & Filtration Working Principle

The FAUDI MIL.4-559 coalescing filter adopts two-stage gradient progressive filtration technology. The outer open fiber layer performs pre-filtration to intercept large-scale sediments and scale, preventing premature clogging of the inner precision media and ensuring uniform fluid distribution across the entire filter area.

During standard in-to-out fluid penetration, micron-level water droplets and oil mist are fully captured by the high-hydrophilic inner glass fiber network. Under continuous fluid shear force, scattered micro-droplets collide, adsorb and polymerize into large-diameter droplets. By gravity effect, the enlarged water droplets separate from the hydrocarbon fluid and settle into the filter sump, while clean fuel flows steadily downstream to complete high-standard purification.

Product Structure & Material Advantages

1. EI 1581 Standard Aviation-Grade Fiber Media

Adopting high-purity borosilicate glass fiber with graded density structure, the media features excellent hydrophilicity and chemical inertness. It is fully compatible with aviation kerosene, diesel, gasoline and various light hydrocarbon solvents, achieving stable particle interception and micro-water coalescing performance without fiber shedding or performance attenuation.

2. Reinforced Polyamide End Cap & Reliable NBR Sealing

Glass fiber reinforced polyamide end caps enhance structural rigidity and aging resistance. Equipped with original-standard NBR sealing gaskets, the filter maintains zero-leakage performance under cyclic pressure and temperature changes, ensuring seamless assembly with genuine FAUDI filter housings.

3. Epoxy-Coated Steel Support & Integrated Hot-Melt Structure

Internal epoxy-coated steel central tube provides strong anti-collapse support, effectively resisting media deformation under high differential pressure. Full automatic hot-melt bonding eliminates adhesive dissolution and secondary pollution risks, supporting 24-hour uninterrupted industrial operation.

Full FAUDI Interchangeable Filter Series (Complete Models)

LEFILTER provides full-range aftermarket replacement elements for complete FAUDI A / Y / MIL / K / P / D / DC series coalescing filters. All models are 100% drop-in compatible with original FAUDI filter housings and systems:

A Series: A.1-559、A.1-842、A.3-842、A.4-727、A.4-842、A.6-467、A.6-842

Y Series: Y.1-842/5、Y.4-467/5、Y.4-559/5、Y.4-842/5、Y.6-362/5、Y.6-559/5、Y.6-842/5、Y.7-362/5、Y.7-842/5、Y.7-1422/5

MIL Series: MIL.6-362、MIL.6-559、MIL.6-842、MIL.1-842、MIL.3-467、MIL.3-559、MIL.3-842、MIL.3-965、MIL.4-279、MIL.4-362、MIL.4-559、MIL.4-727、MIL.4-842、MIL.4-965、MIL.4-1093、MIL.4-1422、MIL.7-362、MIL.7-559、MIL.7-727、MIL.7-842、MIL.7-965、MIL.7-1093、MIL.7-1422

K Series: K.1-842、K.3-467、K.3-559、K.3-842、K.3-965、K.4-279、K.4-362、K.4-559、K.4-727、K.4-842、K.4-965、K.4-1093、K.4-1422、K.7-362、K.7-559、K.7-727、K.7-842、K.7-965、K.7-1093、K.7-1422

P Series: P.1-842、P.3-467、P.3-559、P.3-842、P.3-965、P.4-279、P.4-362、P.4-559、P.4-727、P.4-842、P.4-965、P.4-1093、P.4-1422、P.7-362、P.7-559、P.7-727、P.7-842、P.7-965、P.7-1093、P.7-1422

D & DC Series: D.1-362、D.1-842、D.6-467、DC.1-842-xx、DC.4-279-xx、DC.4-362-xx、DC.4-559-xx、DC.4-727-xx、DC.4-842-xx、DC.4-1093-xx、DC.4-1422-xx、DC.7-362-xx、DC.7-559-xx、DC.7-727-xx、DC.7-842-xx、DC.7-1093-xx、DC.7-1422-xx

Application Fields

LEFILTER FAUDI MIL.4-559 coalescing filter is widely used in aviation fuel supply terminals, military fuel depots, petrochemical refineries and industrial light hydrocarbon purification systems. It effectively removes fine solid particles, free water and oil mist, improving fuel cleanliness and quality stability. It also protects downstream compressors, precision flow meters and control valves from liquid hammer, corrosion and abrasive wear, reducing system failure rate and maintenance costs.

Core Product Advantages

All MIL.4-559 filter elements undergo strict bubble point test and pressure resistance inspection before delivery, achieving 100% dimensional and performance interchangeability with original FAUDI products. Compared with ordinary generic filters, our upgraded gradient fiber media provides higher dirt holding capacity and longer service life, effectively reducing replacement frequency and system downtime. We support full-series FAUDI filter one-stop procurement, sufficient spot inventory and fast global delivery.

FAQ for FAUDI MIL.4-559 Coalescing Filter

Q1: Is LEFILTER MIL.4-559 fully compatible with original FAUDI?

A1: Yes. It completely matches the original in-to-out flow direction, installation size and NBR sealing structure, supporting direct drop-in replacement without equipment modification.

Q2: What standard does FAUDI MIL.4-559 comply with?

A2: It is manufactured and tested in accordance with EI 1581 6th Edition aviation filtration standards, suitable for high-standard aviation and industrial fuel purification.

Q3: What are the operating temperature and pressure limits?

A3: Stable working temperature ranges from -30℃ to +80℃, with a maximum differential pressure of 5.2 bar. Replace timely when DP reaches 1.0 bar.

Q4: What kind of contaminants can this filter remove?

A4: It efficiently intercepts fine solid particles, free water droplets and emulsified oil mist in jet fuel, diesel and light hydrocarbon media.

Q5: Does it support long-term continuous industrial operation?

A5: Yes. Reinforced epoxy steel support and integrated hot-melt sealing ensure excellent structural stability for 24-hour continuous operation.

Q6: Do you supply other FAUDI series replacement filters?

A6: We provide complete A/Y/MIL/K/P/D/DC series FAUDI coalescing filters, supporting one-stop batch procurement for all project and maintenance needs.

Q7: Do you provide sample testing and customization?

A7: Free sample verification is available. We also support customized logo, packaging and bulk order solutions for global customers.

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