1. The intergrated oil circulation system minimizes oil loss.

2. The built-in filters are prevented to occur air pollution. 

3. The surface of oil mist filter is timproved for long life cycle. 

4. The oil gauge, oil inlet and oil outlet is located at same side for easier maintenance. 

5. The pumps are capable of continuative operation under ambient pressure. 

6. The composition of pump is simple, convenient for maintenace manager. 

7. The installation work is simple. 

8. The colling water is not required by using air-cooled structure.