Sealing Excellence, Securing Industry

CFKS NBR DK Oil Seal 63*12*22 DK Type Pneumatic Seal DK Piston Seal

  • The DK Type Piston Seal is a high-performance pneumatic seal designed to provide a secure, low-friction seal in reciprocating cylinder applications. Its compact, double-acting profile ensures stable operation even under rapid pressure fluctuations.

    • Integrated Design: Combines sealing and guiding functions for streamlined piston assemblies.

    • Optimal Friction: Precision-molded NBR reduces startup drag and heat buildup.

    • Standard Compliance: Fully compatible with ISO and standard pneumatic cylinder grooves.

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

Parameter Value Parameter Value
Product Name DK Pneumatic Piston Seal Specification Support Customization / OEM
Material NBR / FKM / PU Feature Low Friction & Wear Resistance
Work Temperature -20℃ to 220℃ Usage Cylinders, Valves, Pumps, Actuators
Hardness 70 – 90 Shore A Type Double-Acting Piston Seal

 

The DK profile operates as a double-acting pneumatic piston seal with a specialized geometry that leverages the system’s air pressure. Unlike V-type seals that focus on axial rotation, the DK type utilizes its reinforced center and flexible sealing lips to maintain constant contact with the cylinder wall. As pressure increases, the lips expand to ensure zero-leakage, while the rounded profile minimizes the “stick-slip” effect, ensuring smooth linear movement in high-frequency pneumatic actuators.

Material integrity is the cornerstone of seal longevity. Our standard NBR formulation offers excellent resistance to petroleum-based lubricants and greases, making it ideal for standard industrial air systems. For high-temperature environments or applications involving aggressive chemical media, we provide FKM options. FKM maintains its elastic memory and sealing force at temperatures exceeding 200°C, preventing the hardening and cracking that leads to catastrophic system failure.

One of the primary operational advantages of the CFKS DK seal is its “easy-fit” geometry, which allows for rapid installation onto the piston head. The material’s inherent elasticity ensures the seal can be stretched into the groove without permanent deformation. To maximize service life, we recommend initial lubrication with a compatible silicone or mineral grease. The low-friction design significantly extends the Mean Time Between Maintenance by reducing wear on the cylinder bore.

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.

CFKS Seal Manufacturing Co.,Ltd.
https://cfksseals.com/
Email:cfksnacy@gmail.com Mobile/WhatsApp/Wechat:(86)188-3097-5917
DK/DP Oil Seal Size List
SIZEMaterialTYPE
20*6*12NBR/FKMDK
25*8*12NBR/FKMDK
30*8*12NBR/FKMDK
32*8*15NBR/FKMDK
40*8*20NBR/FKMDK
40*10*18NBR/FKMDK
50*8*20NBR/FKMDK
50*10*18NBR/FKMDK
50*10*24NBR/FKMDK
60*12*22NBR/FKMDK
60*12*27NBR/FKMDK
63*12*22NBR/FKMDK
63*14*22NBR/FKMDK
63*16*22NBR/FKMDK
65*12*25NBR/FKMDK
70*12*22NBR/FKMDK
70*10*22NBR/FKMDK
75*12*22NBR/FKMDK
75*12*30NBR/FKMDK
16*4.5*6.5NBR/FKMDP
20*6*7.5NBR/FKMDP
25*7*8.5NBR/FKMDP
25*8*7NBR/FKMDP
32*8*10NBR/FKMDP
32*8*11NBR/FKMDP
32*8*8.8NBR/FKMDP
32*10*8.8NBR/FKMDP
40*8*11.8NBR/FKMDP
40*10*14NBR/FKMDP
50*10*14NBR/FKMDP
40*12*14NBR/FKMDP
50*12*10NBR/FKMDP
60*10*14NBR/FKMDP
63*10*17NBR/FKMDP
63*12*14NBR/FKMDP
63*14*14NBR/FKMDP

 

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