1. Strength requirements, manufacturing integrity requirements, bearing pressure difference, bearing installation external force, bearing pressure difference alternating load.

2. The smoothness of oil flow requirements and flow resistance characteristics.

3. It is resistant to a certain high temperature and compatible with the working medium.

4. The fiber of the filter layer cannot be displaced or fall off.

5. It can carry more dirt.

6. Normal use in high altitude and cold areas.

7. Fatigue resistance, fatigue strength under alternating flow.

8. The cleanliness of the filter element itself must meet the standard.

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