... ,couplins,guides,gear reducer etc. Screw Jack Lifting System configurations screw jacks, bevel gearboxes, flex linking shafts ... self locking 2. Multiple jack system, from pair jacks system to fourteen jacks system 3. Electric driven, manual operated ... Industries: Workplace table adjustments, Sluice gate in hydroelectric dam, Pinch valve control actuation, gate and ball valve, Powered straighteners ...