Loaded U-Cup Description
Loaded U-cups are excellent seals for low-pressure rod and piston applications. With loaded U-cups, as the system pressure increases, so does the force on the loading lips. This automatically compensates for the higher pressure, while still maintaining a positive seal. A variety of styles, materials and sizes are available to suit specific requirements.
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Profiles
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 | Square with Straight Lip
The standard O-ring loaded U-cup profile is square in cross section and it is suitable for both rod and piston applications. The standard design can be used to replace existing hydraulic packing and O-Rings without changing gland design. |
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 | Deep with Straight Lip
The deep O-ring loaded U-cup design is a modified version of the standard square U-cup shape. This design has approximately 1-1/2 times the axial depth of the square profile, which greatly adds to the stability of the design in higher-pressure applications. Generally, a gland would have to be modified for this seals when replacing O-rings. The deep O-ring loaded U-cup is an ideal design for replacing V or W packing, or braided rope packing.
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 | Deep with Beveled Lip
The type B O-ring loaded U-cup is similar in design to the deep U-cup with a straight lip, except it features a back beveled sealing lip. The beveled lip is designed to provide additional film breaking ability and increased squeeze on the sealing surface. The back bevel on the lip aligns the seal interface near the centerline of the O-Ring energizer. This provides an increased sealing force, which adds to the low pressure sealing capability while also increasing the high pressure sealing ability. The added length also provides stability to the seal. |
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 | Square with Beveled Lip
The Square beveled design provides you with the additional sealing ability of the back bevel
lip design, while still being able to replace o-rings without changing the groove.
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