Counterbalance valves control motion by guaranteeing the directional valve always sees a positive load pressure, even with overrunning loads. Sun counterbalance valves (with pilot-to-open assist) will shut off with very low (approaching zero) leakage. Absent nicks in the seating area, silting (even with “clean” oil) will normally produce a zero leak seal within minutes after closing. Deceleration control of moving loads can be provided with the proper selection of directional valves and/ or circuitry.
