U-Rings

U-Ring Seals (also called U-seals, U-cup, and Symmetrical seals) is a multipurpose seal that can be fitted either on a rod or a piston cylinder and has a unique “U” shaped profile. Both the outer and inner sealing lips are designed to optimize both rod and piston sealing applications.

The outer static lip seal functions against mating surfaces that have no relative motion between each other. The inside of the U-Seal is a dynamic lip seal that is used where there is motion between surfaces. The “U” shape energizes the sealing lips as the application pressure increases. 

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More about the U-ring seal

The outside is a static lip seal that functions against mating surfaces that have no relative motion between each other. The inside of the U-Seal is a dynamic lip seal that is used for when there is motion between surfaces. The “U” shape energizes the sealing lips as the application pressure increases. 

The primary reason for the existence of U-rings is its interchangeability between rod and piston applications.

The U-Rings have high sealing properties and excellent resistance to abrasion, friction, and wear. Its use is recommended with hydraulic oils, mineral oil-based hydraulic fluids, lubrication oils and HFA/ HFB fluids.

Loaded or unloaded?

Loaded
A loaded U-ring is loaded with an O-ring or sometimes a quad ring, between the two lips of some seals and help increase the sealing force at low pressures while blocking or separating fluid in reciprocating motion applications.

The loaded U-Cup is that when you add a "loader or energizer" to a lip seal, you turn it into a squeeze seal. This provides high sealing force at low pressure. As the system pressure increases, the lip loading also increases, automatically compensating for the higher pressure while maintaining a positive seal

Unloaded 
With an unloaded U-ring, the seal is simply not loaded with an O-ring or a quad ring inside.

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We have a number of items in stock for next day delivery. If you need help or guidance regarding sealing solutions, please fill out our contact form and we will get back to you soon as possible.

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