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Time：2025-11-07 13:46:14 Reading volume：
An oil purifier can effectively filter and restore No. 46 anti-wear hydraulic oil, provided that the purifier type and filter materials are compatible with hydraulic oil properties. Below is a clear explanation of how to achieve the best results.
No. 46 anti-wear hydraulic oil (ISO VG 46) is a medium-viscosity, mineral-based oil widely used in hydraulic systems, presses, and injection machines.
Most vacuum, pressure, or centrifugal oil purifiers are fully compatible with this oil if:
The operating temperature stays within the purifier’s design limit (≤ 80 °C).
The filter media and seals (NBR or FKM) are resistant to petroleum-based oils.
These conditions ensure safe operation and stable filtration performance.
| Purifier Type | Function | Suitability for No. 46 Hydraulic Oil |
|---|---|---|
| Vacuum Dehydration Oil Purifier | Removes free and dissolved water, gases, and fine particles | ✅ Best choice – restores clarity and dielectric strength |
| Pressure / Precision Filter System | Removes solid impurities | ✅ Ideal for routine filtration maintenance |
| Centrifugal Oil Separator | Uses density difference to remove water and sludge | ✅ Effective for heavy contamination |
| Coalescence–Separation System | Eliminates water through coalescing filters | ✅ Suitable for low-moisture conditions |
When processing No. 46 hydraulic oil, aim for:
Cleanliness level: ISO 4406 ≤ 16/14/11 (or NAS 1638 ≤ 6)
Moisture content: ≤ 100 ppm
Particle size: ≤ 5 μm (β₅ ≥ 200 filter element)
These levels help maintain stable hydraulic performance and extend oil service life.
Preheat the oil to 40 – 60 °C to reduce viscosity and improve flow.
Use glass-fiber or composite filter elements for higher efficiency.
Avoid cellulose filters if additives are present—they may absorb them.
Use compatible seals (NBR or FKM) and avoid EPDM for mineral oils.
Monitor inlet pressure to prevent overload during cold starts or thick oil conditions.
Summary
An oil purifier can absolutely filter No. 46 anti-wear hydraulic oil.
For best performance, choose a vacuum dehydration oil purifier equipped with fine filtration (≤ 5 μm) and moisture-removal capability. This setup ensures the oil regains cleanliness, stability, and extended service life, keeping your hydraulic equipment operating reliably.
