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Time：2025-02-10 10:25:35 Reading volume：
The selection of the filtration accuracy of the hydraulic oil filter is crucial and directly affects the performance of the hydraulic system and the life of the equipment. The following are the key factors and suggestions for selecting filtration accuracy:
1. Hydraulic system requirements
- System type: Different hydraulic systems have different requirements for oil cleanliness.
- High-pressure system: Usually requires a higher filtration accuracy (such as 3-5 microns).
- Medium and low-pressure systems: The filtration accuracy can be appropriately relaxed (such as 10-20 microns).
- Component sensitivity: Precision components (such as servo valves, and proportional valves) require higher cleanliness, and it is recommended to choose a filtration accuracy of 1-3 microns.
2. Oil contamination degree
- Contamination level: Assess the oil contamination degree according to ISO 4406 standard.
- When the contamination is serious, you can use a lower-precision filter element for coarse filtration first, and then use a high-precision filter element for fine filtration.
- Type of pollutant:
- Solid particles: ｓｅｌｅｃｔ a filtration accuracy suitable for the particle size.
- Water or gas: A dehydration or degassing function is required.
3. Filtering precision level
- Coarse filtration: The filtration precision is 20-100 microns, suitable for pre-filtration or seriously contaminated oil products.
- Fine filtration: The filtration precision is 3-10 microns, suitable for daily maintenance of general hydraulic systems.
- High-precision filtration: The filtration precision is 1-3 microns, suitable for systems with extremely high cleanliness requirements.
4. Filter element type
- Material: ｓｅｌｅｃｔ the appropriate filter element material (such as glass fiber, or stainless steel mesh) according to the filtration precision.
- Structure: Multi-layer filter elements can improve filtration efficiency and dirt-holding capacity.
5. Equipment performance
- Flow matching: The higher the filtration precision, the greater the resistance. It is necessary to ensure that the equipment flow meets the system requirements.
- Pressure difference control: High-precision filtration may cause an increase in pressure difference. It is necessary to monitor the pressure difference change and ｒｅｐｌａｃｅ the filter element in time.
6. Economy
- Cost balance: High-precision filter elements are more expensive, and a balance needs to be found between cleanliness requirements and economy.
- Maintenance cycle: high-precision filter elements may need to be replaced more frequently, and maintenance costs need to be considered.
7. Industry standards
- Refer to ISO 4406, NAS 1638 and other standards, and ｓｅｌｅｃｔ the filtration accuracy in combination with the cleanliness requirements of the hydraulic system.
Recommended selection:
| Hydraulic system type | Recommended filtration accuracy |
|---|---|
| High-pressure system (>21 MPa) | 1-3 microns |
| Medium-pressure system (10-21 MPa) | 3-5 microns |
| Low-pressure system (<10 MPa) | 10-20 microns |
| Precision components (servo valves, etc.) | 1-3 microns |
| Pre-filtration or heavily contaminated oil | 20-100 microns |
This table clearly shows the different types of hydraulic systems and the corresponding recommended filter fineness.
Summary
The filtration accuracy selection of the hydraulic oil filter needs to comprehensively consider the hydraulic system requirements, oil contamination level, filter element type, equipment performance and economy. ｓｅｌｅｃｔ the appropriate filtration accuracy according to the system pressure and component sensitivity to ensure efficient and stable operation of the hydraulic system.
