1. Balanced spool, immune to variations of pressure. 2. Short stroke with high flow. 3. High shifting forces. 4. Checked accumulator guarantees maximum pilot pressure. 5. Powerful return force thanks to the combination of mechanical and air springs. 6. Bonded spool with minimum friction, shifting in a glass-like finished bore. 7. Wiping effect eliminates sticking. 8. Pilot valve with balanced poppet, high flow, short and consistent response times.