This main operating cylinder series is the primary actuator for the ramp and heavy-duty gangway systems of roll-on/roll-off (Ro-Ro) ships. Typically mounted in pairs at the stern or side of the vessel, they are responsible for smoothly lowering the massive ramp — often tens of meters long and weighing tens of tonnes — to the dock, and then securely retracting and housing it after loading and unloading operations. With a heavy-duty design offering up to 3,500 kN of thrust and an ultra-long stroke up to 7,300 mm in a multi-stage telescopic configuration, the cylinders integrate a counterbalance valve and end-of-stroke cushioning. This ensures exceptionally smooth deployment and stable static holding under challenging conditions such as frequent port cycling, tidal variations, and surging swells. As the vital core equipment for Ro-Ro vessels, this cylinder fully complies with SOLAS and major classification society regulations, supporting real-time position monitoring and remote safety interlock.

This latch cylinder series (mechanical self-locking type) is the passive safety locking element for the ramp and gangway systems of roll-on/roll-off (Ro-Ro) ships, mounted in pairs on the hull locking base. Unlike the hydraulic self-locking type, once this cylinder drives the high-strength stainless steel latch pin into the locking hole, an internal mechanical locking mechanism (such as a spring-loaded wedge or cam lock) retains the pin in the engaged position. Thereafter, even if the hydraulic system is completely depressurized, lines rupture, or pressure is lost, the pin will not disengage. Unlocking requires reverse hydraulic pressure to release the mechanical lock before retracting the pin. Arranged in “front locking” and “rear locking” groups for redundant protection, and featuring a standardized bore series (60/80 mm), stainless steel piston rods, and a compact seawater-corrosion-resistant structure, this series has obtained DNVGL type approval. It is the preferred solution for next-generation Ro-Ro ship safety locking, particularly suitable for Ro-Pax vessels and deep-sea route ships with the highest fail-safe requirements against pressure loss.

This latch cylinder series (hydraulic self-locking type) is the safety locking element for the ramp and gangway systems of roll-on/roll-off (Ro-Ro) ships. Installed in pairs on the hull locking base, it drives a high-strength stainless steel latch pin into the locking hole once the ramp is retracted to its navigation position. The pin is held in engagement by continuous hydraulic pressure, ensuring that the ramp remains absolutely locked during navigation, heavy seas, and emergency maneuvers. The cylinders are arranged in “front locking” and “rear locking” groups, providing redundant locking protection. Featuring a standardized bore series (40/63/80 mm), stainless steel piston rods, a compact seawater-corrosion-resistant structure, and DNVGL type approval, the series fully meets the stringent requirements of SOLAS and major classification societies for locking devices on Ro-Ro equipment.

This push cylinder series is the core actuator for the ramp and gangway systems of roll-on/roll-off (Ro-Ro) ships. It smoothly extends and retracts stern, side, and internal deck ramps, enabling efficient vehicle and cargo transfer between ship and shore, and between decks. Designed with a compact high-strength structure, low-friction sealing, and an integrated counterbalance valve, it provides stable, reliable, and lockable push/pull force under the harsh marine conditions of frequent cycling, wave impact, and salt spray. Optional displacement sensors or proximity switches enable real-time ramp position monitoring and safety interlock, meeting IMO and classification society requirements for Ro-Ro equipment.