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Content 2. U-Cup Design Loaded U-Cups Unloaded Urethane U-Cups Homo U-Cups DZ Seals Spring Energized U-Cups 3. U-Cup Selection Criteria |
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U-Cup Description U-cups are a lip seal, named for the cross-section's distinctive "U" shape. They are used for both dynamic and static applications. The "U" shape energizes the sealing lips as the application pressure increases. This brilliant design has been modified to create several unique configurations. These modifications provide additional benefits for a variety of applications. The U-cups designs listed below are Hi-Tech Seals' most common designs. | |
| U-Cup Designs | | Loaded U-Cups
Loaded U-cups were primarily designed for dynamic reciprocating applications. The O-rings loader makes this seal excellent for low-pressure rod and piston applications. With loaded U-cups as the system pressure increases, so does the force on the loading lips. Sealing force automatically compensates for the higher pressure, maintaining a positive seal. Loaded U-Cup Design |
 | Unloaded Urethane U-Cups The unloaded urethane U-cup design provides an excellent heavy-duty seal for both piston or rod applications and works well in static and dynamic applications. The unloaded urethane U-cup is commonly known as a Disogrin U-cup. Unloaded Urethane U-Cup Design |
 | Homogenous U-Cups Homogenous U-cups are popular in low-pressure applications where a low friction seal would be beneficial. They are most commonly used in pneumatic applications. Homogenous U-Cup Design |
 | DZ Seals DZ seals are squeeze type seals, primarily used for heavy-duty rod applications. DZ seals have excellent sealability, low compression set and superior anti-extrusion characteristics compared to other lip seals. Under low-pressure conditions, the sealing lip provides its own compressive sealing force. DZ Seal Design |
 | Spring Energized Seals Spring energized seals are engineered plastic seals that incorporate a metallic spring. The spring loads the seals lips against the mating hardware, creating a seal capable of compensating for movement in dynamic applications. Spring Energized Seal Design |