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Time：2025-05-15 13:23:20 Reading volume：
An oil filter can effectively filter particulate contaminants in hydraulic oil, but the filtering effect depends on the type and accuracy of the oil filter and the specific requirements of the hydraulic system. Here are the key points:
- Filtration principle:
Remove particulate matter by physical interception (filter element/filter material), adsorption (electrostatic or magnetic), or centrifugal separation.
- Typical accuracy:
- Ordinary hydraulic system: 5~10 μm (meet ISO 4406 18/16/13 level).
- Precision hydraulic system (such as servo valve): 1~3 μm (need to reach ISO 14/12/10 level).
| Oil filter types | Applicable scenarios | Particle filtration capacity | Advantages and disadvantages |
|----------------|-----------------------------|--------------------------------|-------------------------------|
| Filter element type | Conventional hydraulic oil cleaning | 1~30 μm (depending on the filter element grade) | Easy to ｒｅｐｌａｃｅ the filter element, low cost |
| Vacuum oil filter | Hydraulic oil containing water and particles | Can stack filter elements (such as 3 μm + vacuum dehydration) | Multifunctional, but large in size |
| Centrifugal | Large particles/high viscosity oil (such as gear oil) | 10~100 μm (lower precision) | No consumables, but cannot handle tiny particles |
| Electrostatic | Ultra-precision system (aviation, medical) | 0.1~1 μm (NAS level 4 or below) | Extremely high precision, but expensive equipment |
- Filtration accuracy: ｓｅｌｅｃｔ ≤50% of the system required accuracy (e.g., the system requires 5 μm, ｓｅｌｅｃｔ a 2~3 μm filter element).
- β value (filtration ratio):
- β₅≥200 (indicates that the filtration efficiency for 5 μm particles is ≥99.5%).
- Flow matching: The oil filter flow rate is ≥20% of the hydraulic system tank capacity (e.g., the tank is 500L, ｓｅｌｅｃｔ ≥100L/min).
- Filter element replacement: ｒｅｐｌａｃｅ immediately when the pressure difference alarm (usually >0.3MPa) or the particle count exceeds the standard.
- Oil sample detection: Use a particle counter (such as ISO 4406) to verify cleanliness before and after filtration.
- Avoid secondary contamination:
- Clean the oil filter pipe before use.
- Keep the oil tank sealed during filtration to prevent air dust from entering.
- Economical: Filter element oil filter (such as Pall HC8900 series) + regular oil sample testing.
- High precision requirements: Electrostatic oil filter (such as HYDAC EDS-3000) or coalescing oil filter.
If you need specific models or working conditions, please provide hydraulic system parameters (oil type, target cleanliness, etc.)!
