Products
Hydraulic Seals
U-Cup For Hydraulic
Product Overview
KAFLON® U-Cup Seals for Hydraulic are high-performance dynamic rod seals designed for reciprocating motion in hydraulic systems. The optimized U-shaped lip design provides excellent sealing efficiency, low friction, and long service life, even under demanding pressure and speed conditions.
Compared with conventional sealing solutions, U-Cup seals offer improved dynamic sealing capability by allowing system pressure to energize the sealing lips, ensuring consistent contact with the rod surface.
Advantages vs Standard Sealing Solutions
| Feature | O-Ring | U-Cup Seal |
|---|---|---|
| Dynamic sealing | Limited | Excellent |
| Wear resistance | Moderate | High (especially PU) |
| Pressure capability | Medium | High |
| Service life | Medium | Long |
| Stick-slip effect | High | Low |
FEATURE 01
Excellent dynamic sealing performance
FEATURE 02
Low friction and reduced stick-slip behavior
FEATURE 03
High resistance to wear and extrusion
FEATURE 04
Suitable for high-pressure applications
FEATURE 05
Suitable for high-pressure applications
FEATURE 06
Long service life under repetitive motion
Typical Applications
KAFLON® U-Cup Seals are widely used in:
- Hydraulic cylinders
- Construction and mobile equipment
- Industrial presses
- Agricultural machinery
- Mining and heavy-duty equipment
- Pumps and control valves
These applications require robust dynamic sealing performance with excellent wear resistance and long service life.
Material Options
KAFLON® offers a wide range of materials to meet different application requirements:
| Material | Key Advantages | Typical Applications |
|---|---|---|
| PU (Polyurethane) | Excellent wear resistance, high strength, extrusion resistance | Heavy-duty hydraulics, construction equipment |
| NBR | Cost-effective, good oil resistance | Standard hydraulic systems |
| HNBR | Improved temperature and mechanical properties | High load and temperature applications |
| FKM | Excellent chemical and high-temperature resistance | Aggressive media and high-temperature environments |
👉 PU U-Cup seals are the most commonly used option due to their superior durability and resistance to abrasion in demanding hydraulic applications.
do you have any question?
What are typical applications?
Used in:
Hydraulic cylinders
Construction machinery
Industrial equipment
What pressure can U-Cup seals handle?
Typically up to 40 MPa (400 bar), depending on material and design.
Why use U-Cup seals instead of O-rings?
U-Cup seals offer better dynamic sealing, lower friction, and higher pressure resistance, making them ideal for hydraulic applications.
Can U-Cup seals be customized?
Yes, KAFLON® offers custom sizes, materials, and designs based on application requirements.
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