Figure 12
From: Present Status and Prospect of High-Frequency Electro-hydraulic Vibration Control Technology
Pilot rotary-spool driven electro-hydraulic directional control valve. 1. Rotary motor; 2. Coupling; 3. Torsional spring; 4. Oil supply port; 5. Oil return port; 6. High pressure oil circuit; 7. Back valve sleeve window; 8. Low pressure spiral groove; 9. Main spool; 10. Compression spring; 11. Left sensitive chamber; 12. High pressure spiral groove; 13. Front valve sleeve window; 14. Right sensitive chamber; 15. Low pressure oil circuit; A. Valve sleeve moving direction; B. Pilot rotary spool rotation direction; C. Main spool moving direction