| 摘要 |
An improved jacking system for a liftboat with a high speed manifold system with high speed motors and high speed planetary gear drives, a heavy lift manifold system with heavy lift motors and heavy lift planetary gear drives, and bypass valves for diverting hydraulic pressure between the high speed manifold system and the heavy lift manifold system. The improved jacking system makes the boat easier to position precisely and expands the weather and sea condition envelope the liftboat can operate in by reducing its exposure to multiple impact stresses while jacking up in rough sea conditions. The improved jacking system also serves as a safety device which can quickly “tag” the bottom to stop and stabilize the liftboat's motion in a close situation.
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