U-Cups (U-Packing or U-Ring) are the most compact and versatile of the many lip type seals available. In its several configurations, it may be utilized as an ID - Rod Seal, or an OD - Piston Seal. U-cups with long thin lips may exhibit very low dynamic friction and can accommodate out-of-round or eccentric components. Shorter, heavy, lips provide a more reliable seal at low pressures and are better suited for sealing at high pressures.
Common modifications
Asymetrical lips,
net molded or knife trimmed lip (symmetrical legacy AN 6226)
Catalog StandardsAN, varies by OEM
CustomizableYes
Comparative cost: $$
Special Applications
Lip/rod interface customizable from fully dry to self lubricating, high pressure delta possible, gland OD sizes seal lip to rod
More Information
Sizing standards
Standard hydraulic rod inch and metric sizes with profile and gland dimensions varying by OEM. Consult with Darcoid technical team for the optimal selection for your specific application.
Modifications
Asymmetrical lips for modifying load transfer and dynamic performance. Heel bumps for in groove stability. Shaped heel for integrated anti extrusion devices
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Data Sheets
VMQ Material Compound #5012
Darcoid VMQ (Silicone) Material Compound Data Sheet #5012. Original test data stored in the Darcoid Compound Database. This material is available to run in our manufacturing partner plant in N..
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