Ultra-High Thrust & Long Stroke Heavy-Duty Construction
The barrel is forged from high yield-ratio quenched & tempered alloy steel, with FEA-optimized stress distribution at the gland, flanges, and clevises. All welds undergo 100% UT/MT. The piston rod is a large-diameter solid forging with hard chrome plating or laser-clad nickel-based alloy. At full extension under maximum offshore lifting moment, the cylinder maintains exceptional bending stiffness and stability.
Integrated Counterbalance Valve, Safe Holding
A standard high-flow counterbalance valve or hydraulic lock instantly holds the A-frame at any luffing angle. Even if a hydraulic hose bursts or system pressure is lost, the frame will not free-fall, ensuring absolute safety for deck personnel and equipment.
Optional Ice Scraper for Polar Operations
For polar ice zone operations, a spring-loaded metallic ice scraper can be fitted on the exposed piston rod. It effectively clears ice and frost from the rod surface during retraction, protecting the main seal from ice crystal scoring and ensuring smooth, reliable operation at low temperatures.
Position Feedback & Intelligent Control
An optional built-in or external magnetostrictive displacement sensor (±0.5 mm accuracy) provides real-time piston position feedback corresponding to the A-frame luffing angle. This integrates with the vessel control system for precise lifting positioning, limit protection, and remote monitoring.
Comprehensive Marine Anti-Corrosion
The cylinder exterior is coated with a marine-grade heavy-duty coating system. All exposed fasteners are duplex stainless steel. The piston rod is available with hard chrome, Ni/Cr alloy plating, laser cladding, or ceramic spray, with a salt spray resistance exceeding 6,000 hours, ensuring decades of rust-free service in splash zones and salt-laden atmospheres.
Complete Third-Party Certification
Type approval certificates from major classification societies — CCS, ABS, DNV, BV — are available. Full material traceability ensures compliance with IMO and international offshore safety regulations.
Maintenance-Free Pivots & Flexible Mounting
Self-lubricating composite bushings are standard in the clevises, eliminating greasing and withstanding long-term high humidity and salt spray. Mounting dimensions, port orientations, and pin sizes are customized to the hull structure.
