Sealing Excellence, Securing Industry

CFKS High Quality NBR Water Seal 18*30*6 EPDM Water Oil Seal for Excavator Hydraulics

This industrial-grade NBR water seal 18*30*6 is engineered specifically for heavy-duty excavator hydraulics, providing a robust barrier against contaminants while maintaining internal fluid pressure. Designed for high-speed rotation and axial stability, it ensures long-term operational reliability in harsh environments.

  • Dynamic Resilience: High-elasticity NBR compound absorbs mechanical shocks and axial misalignments.

  • Thermal Stability: Operates consistently across a wide temperature gradient without hardening or cracking.

  • Zero-Leak Interface: Optimized lip geometry minimizes friction while maximizing the centrifugal sealing effect.

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

Parameter Value Parameter Value
Product Name NBR Water Seal 18*30*6 Specification Standard & Custom Support
Material NBR / FKM / EPDM Feature High Pressure & Wear Resistance
Work Temp. -20℃ to 220℃  Hardness 70 – 90 Shore A
Type VA / Rotary Axial Seal Usage Boom Cylinders, Pumps, Motors

 

The VA-style design of this seal operates on the principle of axial contact against a counter-face. As the shaft rotates, centrifugal force deflects the seal lip outwards, reducing contact pressure and friction at higher speeds while maintaining a tight seal at rest. This axial tensioning ensures that the seal remains effective even in applications with significant shaft run-out or end-play, common in heavy hydraulic machinery.

Selecting the correct elastomer is critical for seal longevity. Our standard NBR offers exceptional resistance to mineral oils, greases, and water, making it the ideal choice for general hydraulic applications. For environments involving aggressive chemicals or temperatures exceeding 120°C, we provide FKM variants. Both materials are processed to ensure high abrasion resistance and low compression set, extending the mean time between failures.

One of the primary advantages of this specific profile is the simplified installation process. The flexible nature of the NBR material allows for “stretch-over” installation, often eliminating the need to fully disassemble shafts or complex housings. This “low-friction” design not only preserves the integrity of the counter-face but also reduces power consumption and heat generation, significantly lowering the overall maintenance overhead for fleet operators.

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
High Pressure Water Seal Size List
TypeSIZETypeSIZE
v type18*30*5.5U type15*22*5
v type18*28*5.5U type15*24*5
v type18*32*6U type18*26*5
v type20*32*5.5U type18*28*6
v type20*28*5.5U type20*28*5.7
v type22*28*5.5U type20*30*6
v type16*24*5.5U type28*36*5.9
v type15*25*5.5U type28*38*5.9
v type18*35*7U type22*30*6
v type14*26*5U type12*20*5
v type22*32*.5U type14*22*5
v type18*26*5.5U type18*24
v type20*35*5.5U type25*37*6.4
v type18*35*7U type13*20*5
v type18*32*7U type14*20*5
v type20*30*6U type16*24*5.5
v type20*35*7U type18*25*5
v type18*30*6U type20*35*6
v type24*35*6U type24*34*6
v type15*28*5U type18*25*5
v type18*32*5.5U type18*28*6
v type12*20*5U type18*26*6
v type12*22*5.5U type22*32*5.5
v type18*32*7.1U type18*26*5

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