U-Cup/ Rod Seal
A majority of rod seals are manufactured utilizing a precision knife trim process to ensure the sealing contact with the dynamic surface yields the best possible performance.
The U-Cup (U-Packing or U-Ring) is 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.
The U-cup with long thin lips has very low dynamic friction and can accommodate out-of-round or eccentric components.
Other configurations with short heavy lips provide a more reliable seal at low pressures and are better suited for sealing at high pressures.