Sealing Excellence, Securing Industry

CFKS DK Piston Seal 70*12*22 Hydraulic Cylinder DK Seal NBR DK Rubber Oil Seal

The CFKS DK Piston Seal 70*12*22 is a premium double-acting pneumatic and hydraulic seal designed specifically for complete piston assemblies. Its integrated geometry provides high sealing efficiency and excellent mechanical stability, ensuring peak performance in high-pressure environments where space and friction management are critical.

  • Zero Leakage Integrity: Precision-molded NBR/FKM ensures a tight seal against cylinder walls.

  • Integrated Design: Combines sealing and guiding functions to prevent metal-to-metal contact.

  • Rapid Response: Optimized profile reacts instantly to pressure changes for consistent cylinder force.

Parameter Content Parameter Content
Product Name CFKS DK Piston Seal Specification 70*12*22
Material NBR / FKM / PU Feature High Pressure & Wear Resistance
Work Temp -30℃ to 200℃ Hardness 70 – 90 Shore A
Type Double-Acting Piston Seal Usage Excavators, Presses, Cranes, Lifts

 

The DK type is a complete piston seal featuring a specialized double-acting profile. Unlike standard U-cups, the DK geometry utilizes axial and radial sealing lips that respond dynamically to fluid pressure. When pressurized, the elastomer expands to create a positive interface with the cylinder bore, while the integrated vulcanized metal disc (in specific variants) or the reinforced center provides the necessary structural rigidity to prevent extrusion under high centrifugal or linear forces.

 

 

Material science is the cornerstone of CFKS seal longevity. For standard hydraulic oil and air applications, we utilize high-grade NBR, offering excellent resistance to compression set and wear. For high-temperature environments or aggressive chemical media, our FKM variants provide superior thermal stability up to 200°C. This selection ensures the elastomer maintains its elastic modulus and sealing force, even under fluctuating thermal cycles.

 

The DK Piston Seal is engineered for ease of maintenance, featuring a robust profile that simplifies the assembly process. Its design allows for direct mounting onto the piston rod without the need for complex multi-part housings. To maximize service life, we recommend ensuring the cylinder bore is polished to a Ra of 0.3μm to 0.5μm. This reduced surface roughness, combined with the DK’s low-friction lip design, significantly extends the mean time between failures.

 

 

 

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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