Professional O-Ring and Oil Seal Manufacturer, Sealing Solution Supplier Since 2008.
DDKK High-Performance Combination Seal for Double-Acting Hydraulic Cylinders
High-Pressure, Low-Friction – For Heavy Machinery
The DDKK combination seal is a high-performance sealing solution engineered specifically for double-acting hydraulic cylinders, with its core design focused on stable sealing and low-friction operation in high-pressure environments. Its composite structure integrates wear-resistant materials and elastic compensation properties, enabling it to withstand intense high-pressure impacts while reducing component wear and extending equipment service life. Widely suited for heavy machinery, industrial hydraulic systems, and similar applications, it maintains reliable performance in both frequent start-stop cycles and continuous operation. This seal delivers efficient, long-lasting sealing protection for hydraulic equipment.
5.0
design customization
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Product Advantages
High-Pressure Resilience: Engineered to handle extreme pressure loads (up to 620 bar/9000 psi), ensuring leak-free performance even in high-impact hydraulic systems. Its reinforced structure prevents extrusion under intense pressure, maintaining seal integrity.
Low-Friction Efficiency: The PTFE-bronze composite sliding ring minimizes friction, reducing energy loss and heat generation during operation. This design lowers wear on cylinder walls, extending overall equipment lifespan by 30%+ compared to standard seals.
Durable & Adaptive: Combines wear-resistant materials with elastic compensation elements, adapting to temperature fluctuations (-30°C to +120°C) and minor surface irregularities. Resists degradation from hydraulic fluids, ensuring long-term reliability.
Easy Installation: Modular design simplifies fitting, with precise dimensional tolerance ensuring compatibility with standard cylinder grooves. Reduces downtime during maintenance or replacement.
Working Principle
The DDKK combination seal operates through the synergistic action of its multi-component structure to achieve reliable sealing in dynamic hydraulic environments. The nitrile rubber (NBR) elastomer ring provides initial preload, ensuring tight contact with the cylinder wall even at low pressure to prevent leakage. As system pressure increases, the elastomer compresses, driving the PTFE-bronze sliding ring outward to form a primary seal interface—its low-friction minimizes energy loss while maintaining a tight seal against pressure fluctuations.
Polyurethane (PUR) support rings reinforce the structure, resisting extrusion into gaps under high pressure and distributing forces evenly across the seal assembly. Meanwhile, the integrated guiding elements stabilize the piston movement, preventing metal-to-metal contact and reducing wear. This dynamic interaction between elastic compensation, rigid sealing, and structural reinforcement enables the seal to adapt seamlessly to varying pressures, temperatures, and movement speeds, delivering consistent performance across diverse hydraulic applications.
Product Details
Composite Structure: Features a PTFE-bronze main seal ring for low friction, nitrile rubber (NBR) elastomer for dynamic pressure compensation, and polyurethane (PUR) support rings to prevent extrusion. Optional FKM elastomer available for high-temperature applications.
Surface Compatibility: Optimized for cylinder walls with Ra 0.3-0.5 μm roughness, ensuring effective sealing without excessive wear. Suitable for both steel and chrome-plated surfaces.
Dimensional Flexibility: Available in a range of sizes (customizable upon request) to match diverse cylinder specifications, with standard configurations covering most industrial and heavy machinery requirements.
Application Range
Heavy Machinery: Excavators, cranes, and bulldozers, where frequent pressure spikes and heavy loads demand robust sealing.
Industrial Hydraulics: Injection molding machines, hydraulic presses, and metallurgical equipment, supporting continuous operation under high pressure.
Mobile Hydraulics: Agricultural machinery, mining equipment, and construction vehicles, adapting to harsh working environments.
Specialized Systems: Servo hydraulic cylinders and high-precision hydraulic tools requiring consistent low-friction performance.
FAQ
What temperature range does the DDKK seal handle?
Standard version operates from -30°C to +120°C; FKM-customized models extend to +200°C for high-heat applications.
Can it be used with mineral oil and synthetic hydraulic fluids?
Yes, compatible with most mineral-based oils, water-glycol mixtures, and synthetic hydraulic fluids (contact us for specialized mediums).
How to ensure proper installation?
Follow groove dimension guidelines (available in technical datasheets) and avoid sharp tools during fitting to prevent damage to the PTFE components.
What’s the expected service life?
Typically 2-3 times longer than conventional seals in similar conditions, with average lifespan exceeding 10,000 operating hours in standard industrial use.
Company Selling Points
Customization Capability: Offer tailored solutions for unique groove sizes, temperature requirements, or chemical resistance needs, with fast turnaround for prototype samples.
Quality Assurance: Manufactured under strict ISO 9001 standards, each seal undergoes pressure and wear testing to ensure compliance with performance specifications.
Technical Support: Provide groove design consultation, installation guidance, and application-specific recommendations from our team of hydraulic sealing experts.
Global Availability: Backed by a network of distributors, ensuring timely delivery and localized after-sales service for clients worldwide.
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