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CFKS DKB Oil Seal 35*47 DKB Double Lip Scraper Oil Seal Hydraulic Cylinder Dust Seal

The CFKS 35*47 DKB Double Lip Scraper Oil Seal is high-performance axial seal engineering designed to protect hydraulic cylinder systems from external dirt, dust, and moisture ingress while maintaining optimal lubrication retention.

  • Double-Lip Protection: Primary scraper blade wipes foreign particles clear while the inner sealing lip retains system fluid.

  • Heavy-Duty Durability: Engineered with high-rigidity metal casing bonded to oil-resistant elastomers to resist centrifugal force and extrusion.

  • Easy Retrofit: Standardized 35*47 dimensions ensure direct replacement and tool-free seating in standard hydraulic glands.

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

Product Name CFKS DKB Oil Seal Specification 35*47mm (Custom Sizes Available)
Material Premium NBR / FKM / PU Feature High Pressure, Wear & Abrasion Resistant
Work Temperature -20℃ to 220℃ Usage Hydraulic Cylinders, Excavators, Presses, Loaders, Pumps
Hardness 70 – 90 Shore A Type Double Lip Scraper / Wiper Dust Seal

 

The CFKS DKB Series functions as a specialized axial rotary seal and dust-scraper combo operating within reciprocating hydraulic systems. During stroke execution, the flexible outer elastomeric lip exerts targeted surface pressure against the moving rod. This lip profile actively displaces abrasive grit, mud, and external particulate before contamination can compromise the primary wiper element or internal dynamic packings. Concurrently, the secondary internal sealing geometry maintains fluid film equilibrium, drastically reducing friction-induced thermal degradation without permitting dynamic fluid loss.

Standard configurations utilize high-grade NBR bonded to a structural metal cage, providing exceptional resistance to mineral oils, greases, and dynamic mechanical shear. For extreme temperature thresholds or aggressive chemical exposure—including synthetic hydraulic fluids—a FKM elastomeric matrix is specified. This material combination prevents hardening, degradation, and permanent deformation under continuous cyclic pressures, maintaining elasticity and structural sealing integrity across demanding industrial workloads.

Designed for straight-bore housings, the metal-cased outer diameter ensures precise drive-in fitment without risk of axial shift during operations. Prior to installation, light pre-lubrication of the sealing lip prevents dry runs during initial startup. Maintenance requirements are significantly reduced due to the seal’s self-cleaning lip profile and low-coefficient friction performance, eliminating the need for frequent teardowns or shaft modifications during routine service intervals.

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.

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