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CFKS PU UR Oil Seal 160*176*18 High Pressure UR Type Rotary Seal U-Cup Oil Seal for Hydraulic Cylinder

Engineered for high-pressure hydraulic cylinders, the CFKS PU UR 160*176*18 rotary U-cup oil seal offers high resistance to wear, extrusion, and fluid bypass. Its optimized polyurethane profile maintains a tight dynamic axial seal under shifting mechanical loads, extending overall equipment maintenance intervals.

  • High Extrusion Resistance: Specially formulation PU resists deformation under continuous high-pressure conditions.

  • Superior Dynamic Sealing: U-cup geometry utilizes hydraulic system pressure to enhance lip contact and prevent fluid bypass.

  • Broad Application Range: Designed for smooth integration into excavators, hydraulic presses, and heavy-duty industrial actuators.

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

Product Name PU UR Oil Seal 160*176*18 Work Temperature -20℃ to 220℃
Specification 160*176*18 mm (Customization Supported) Usage Hydraulic Cylinders, Excavators, Injection Molding Machines, Presses, Agricultural Equipment
Material PU / NBR / FKM Hardness 90° – 95° Shore A
Feature High Pressure & Wear Resistance Type UR Type U-Cup Rotary Seal

 

The UR-type U-cup profile operates on a pressure-energized sealing mechanism designed specifically for dynamic reciprocating and rotary hydraulic rods. As system fluid pressure climbs, force builds against the interior cavity of the U-cup profile, naturally flexing the inner and outer lips tighter against the housing wall and shaft surface. The primary seal interface relies on controlled lip radial squeeze to maintain zero leakage during low-pressure standby, while leveraging working fluid forces to handle intense peak pressures without experiencing excessive friction, stick-slip, or blow-by.

Manufactured from high-grade PU, this seal exhibits exceptional resistance to tensile wear, abrasion. Polyurethane maintains its structural memory and elasticity even when exposed to demanding mineral-based hydraulic oils, grease, and continuous friction. For specialized heavy-industry applications involving higher operating thermal bands, FKM alternatives are available to protect seal integrity against extreme fluid temperatures and aggressive chemical additive packages without causing premature hardening or cracking.

Featuring a flexible dynamic U-cup design, the 160*176*18 UR seal enables straightforward snap-in installation into standard closed housing grooves without requiring complete shaft disassembly or major overhaul setups. The low-friction elastomeric contact face minimizes breakaway forces, reducing heat generation during quick strokes and significantly slowing seal lip wear. Regular maintenance inspections should include verifying housing cleanliness, checking shaft surface finish for micro-pitting, and ensuring proper pre-lubrication during fitting to preserve maximum operating service life.

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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