Loaded U-Cup Seals

KOK supplies loaded U-cup seals for hydraulic and high-pressure fluid power applications, including industrial and oil & gas environments.

Loaded U-cups combine a primary sealing profile with an internal elastomeric energizer (typically an O-ring), providing pressure-responsive sealing performance in reciprocating rod or piston systems.

Functional Characteristics

Loaded U-cups are designed to support:

• Hydraulic rod and piston sealing
• Pressure-responsive contact force
• Improved low-pressure sealing through O-ring energization
• Resistance to extrusion under elevated pressure

Seal design and material selection are aligned with operating pressure, media compatibility, and temperature range.

Application Scope

KOK loaded U-cups are supplied for:

• Hydraulic cylinders
• Industrial fluid power systems
• Oil & gas equipment
• Heavy-duty reciprocating applications

Custom dimensions and material combinations are supported based on customer-provided drawings and system specifications.