Sealing Excellence, Securing Industry

CFKS PU DKBI Dust Oil Seal 55*69*8/11 Leakage-free DKBI Oil Seal Hydraulic DKBI Wiper Seal

Engineered for demanding hydraulic systems, the CFKS PU DKBI Dust Oil Seal 55*69*8/11 delivers dual-acting protection by scraping exterior contaminants off the rod while retaining internal fluid pressure. Constructed from high-grade PU, it prevents premature cylinder scoring and system leakage under extreme impulse pressures.

  • Dual-Action Design: Scrapes fine dirt and retains grease film in a single compact profile.

  • Metal-Cased Stability: Outer metal skeleton ensures a rigid press-fit prevents axial walking in the groove.

  • Premium PU Formulation: High abrasion resistance with minimal compression set under dynamic load.

Find your sealing solution with CFKS — contact us for a quote.

Product Name CFKS PU DKBI Dust Oil Seal Work Temperature -20℃ to 220℃ (Material Dependent)
Specification 55*69*8/11 (Custom Sizes Supported) Usage Hydraulic Cylinders, Excavators, Presses, Loaders, Agricultural Equipment
Material PU / NBR / FKM Hardness 90-95 Shore A
Feature High Wear Resistance, Leakage-Free Type Metal-Cased Hydraulic Wiper Seal

 

The DKBI seal operates on a dynamic wiping principle combined with secondary fluid retention. As the piston rod extends, the primary elastomeric wiping lip maintains continuous radial force against the surface, stripping dust, mud, and fine particulates to prevent contamination of the hydraulic fluid. On the retract stroke, its inner sealing lip controls fluid film thickness, drastically reducing dynamic leakage. The integral outer metal shell provides structural stiffness, ensuring uniform circumferential contact even under severe thermal expansion and high-speed reciprocal motion.

Crafted from premium-grade PU, the DKBI profile exhibits superior tensile strength, tear resistance, and anti-extrusion capabilities compared to standard elastomers. For standard hydraulic applications operating within oil-based media, PU maintains high elasticity and dynamic lip flex. When exposed to harsh operational conditions—such as elevated thermal environments or synthetic hydraulic fluids—the material selection can be optimized using high-performance NBR or FKM compounds, ensuring zero lip cracking, low swell, and extended service intervals.

Installing the DKBI wiper seal requires minimal downtime due to its precise dimensional tolerance and metal-reinforced shell. The seal is press-fitted into an open housing groove, requiring standard fitting tools without thermal pre-treatment or complex axial disassembly. Proper deburring of the shaft chamfer during assembly prevents lip damage. Its low-friction compound minimizes breakaway force, reducing stick-slip phenomena and dramatically extending overall seal wear life in severe-duty hydraulic cylinders.

Frequently Asked Questions (FAQ)

Why does my CFKS oil seal fail prematurely? Common causes and prevention tips2025-06-26T15:44:39+08:00

Premature oil seal failure can result from improper installation, poor shaft finish, incorrect material selection, or excessive pressure. To prevent this, ensure the shaft surface is smooth and within tolerance, use correct tools during installation, and choose seals made from materials compatible with your media and temperature.

How to correctly install a CFKS industrial oil seal to avoid leakage2025-06-26T16:04:32+08:00

Always clean the shaft and bore before installation. Use appropriate seal drivers to avoid deformation. Lubricate the lip before fitting to reduce friction during the first rotation. Ensure the seal is seated evenly and not tilted to avoid leaks.

What to do when your CFKS hydraulic seal is leaking under pressure2025-05-20T16:33:14+08:00

Check if the pressure exceeds the seal’s rated limit. Examine for wear, hardening, or improper installation. Replace the seal if damaged, and consider upgrading to a high-pressure CFKS seal variant. Also, verify that the housing and shaft are properly aligned.

How to choose the right CFKS oil seal for extreme operating environments2025-05-20T16:34:39+08:00

For high temperatures, aggressive chemicals, or abrasive environments, choose CFKS seals made of FKM, PTFE, or high-performance elastomers. Consider using seals with protective dust lips or metal casing. Our team can recommend the best fit for your application.

MESSAGE

Go to Top