This traveling cylinder is the main drive element of the stepping system on cutter suction dredgers (CSD). Mounted between the spud carriage frame and the vessel hull, it pushes and pulls the entire vessel to step forward along the spud rail, enabling precise positioning and incremental advance during dredging. In each dredging cycle, when one spud is firmly planted in the seabed, the cylinder extends or retracts to move the vessel around or along that spud, covering the cut area continuously. Featuring a large bore (up to 480 mm) and an ultra-long stroke (up to 9,400 mm), it operates steadily at low speed and high thrust, absorbing the massive axial loads from vessel inertia, current drag, and spud reaction. The cylinder integrates a heavy-duty structure, waterproof sealing, safety lock valves, and intelligent position monitoring, allowing long-term maintenance-free operation in the high-sediment environments of inland, coastal, and offshore waters.

This spud kick cylinder (piling cylinder) is the auxiliary pile extraction actuator of the positioning and stepping system on cutter suction dredgers (CSD). Typically installed in pairs on the spud frame or deck foundation, it provides hydraulic thrust to a lever or wedge mechanism at the base of the spud, generating a massive upward force to break the suction between the spud and the seabed, enabling a rapid pull-out. During the stepping cycle, after the main spud cylinder retracts, the kick cylinder delivers the extra push needed to free the spud quickly from the bottom, minimizing stepping auxiliary time. With a high thrust output (up to 3,140 kN) over a short stroke, it produces an enormous moment while operating reliably under high side loads, strong vibration, and heavy sediment. Integrated special anti-corrosion coatings, heavy-duty waterproof seals, and safety valve packages fully suit the harsh conditions of inland, coastal, and offshore waters.

This spud cylinder is the core actuator of the positioning and stepping system on cutter suction dredgers (CSD). Vertically mounted within the stern spud frame, it hydraulically lowers the spud (anchor pile) into the seabed to fix the vessel in position, and raises it for recovery. During dredging, one spud is planted in the seabed as a pivot while the other is raised; the vessel then swings around the pivot using side winches to cut material. For advancing, the cylinders lift and lower the spuds alternately in a stepping motion. Featuring an ultra-high push/pull force (up to 7,500 kN push / 5,000 kN pull) and a long stroke (up to 5,200 mm), the cylinder maintains smooth lifting and reliable locking under the huge side loads caused by the weight of the spud, water resistance, and vessel sway. Integrated multi-stage waterproofing, side-load resistant guiding, and safety valve packages ensure maintenance-free operation over the long term in inland, coastal, and offshore environments with high salt spray and sediment.

This heave compensation cylinder is the critical dynamic balancing element for the suction tube system of trailing suction hopper dredgers (TSHD). Installed between the hanger frame and the draghead, or within a dedicated compensator mechanism, it compensates for the vessel's heave motion induced by waves, maintaining a constant contact force between the draghead and the seabed — preventing lift-off or excessive downforce. Featuring a high-speed low-friction design and working in tandem with an accumulator system for active or passive heave compensation, the cylinder smoothly extends and retracts at typical wave frequencies (0.05–0.5 Hz) with instantaneous speeds up to 0.5 m/s. The long-stroke, high-rigidity guiding system and specialized waterproof sealing enable maintenance-free operation in the deep-sea, high-salinity, high-vibration dredging environment, dramatically improving excavation efficiency and extending draghead service life.

This hanger cylinder is the core deployment actuator for the suction tube system on trailing suction hopper dredgers (TSHD). Mounted between the vessel’s gantry and the suction tube frame, it extends and retracts the hanger, indirectly controlling the depth of the trailing draghead and suction pipe into the water for digging, or lifting them clear for sailing. During dredging, the cylinder must steadily withstand massive tensile forces to keep the draghead firmly on the seabed while the vessel rolls, pitches, and pitches in waves. When the gear is stowed, it must lock securely to prevent accidental deployment. Featuring a high-tensile, long-stroke design, an integrated wave-compensation accumulator interface, counterbalance valve, and specialized watertight sealing, it operates maintenance-free for extended periods in the deep-sea, high salt-spray, and high-vibration environment.

This mud door cylinder series is the core actuator of the bottom discharge system on trailing suction hopper dredgers (TSHD). Mounted in pairs along the hopper sides or at the conical bottom doors, these cylinders open and close the mud doors to rapidly dump the dredged material and ensure a watertight seal during navigation. With a heavy-duty design delivering up to 2,355 kN of pulling force per cylinder, they securely lock the doors against the enormous static head of thousands of tonnes of mud slurry, preventing leakage during transit and avoiding jamming during discharge. Combining high-strength anti-fatigue construction, multi-stage waterproof sealing, and integrated safety valve packages, the cylinders operate reliably for decades in the aggressive conditions of mud, saltwater, high humidity, and frequent cycling. An optional displacement sensor enables real-time door position monitoring.

This overflow cylinder is specifically designed for the adjustable overflow system on trailing suction hopper dredgers (TSHD). It raises and lowers the overflow weir or pipe via a wire rope or direct linkage, precisely controlling the overflow height within the hopper to optimize loading efficiency for different soil types while maintaining safe sailing draft. Featuring a high pulling force (up to 900 kN) and a long stroke (up to 6,000 mm), the cylinder provides smooth, steady motion and zero-leakage performance under the harsh conditions of mud, frequent adjustment, and saltwater spray. With integrated multi-stage waterproofing and corrosion protection, it meets IHO and classification society requirements, delivering safe, efficient, and long-life level control power for dredgers.

This split barge cylinder is the core actuator of hydraulic split barges (split-hull hopper barges). Mounted in pairs on either side of the central hinged axis, these cylinders pull or push the two hull halves to open and close, enabling rapid discharge of dredged material and secure closure for transit. The cylinder features an ultra-large bore, a robust tension-rod design, and can sustain tens of thousands of kN of locking force. Even under a full load of mud, sand, and wave impact, it rigidly holds the hull closed, ensuring safe navigation and dumping. With special seawater-resistant coatings, watertight sealing, and built-in cushioning, it operates reliably for decades in the harsh conditions of port channels, coastal reclamation, and inland dredging, without corrosion or leakage.