Non-preload lip type
Non-preloaded lip piston seals, such as classic U-cups and Y-rings, are engineered to maximize sealing efficiency through fluid pressure. These profiles rely on the system's dynamic pressure to flare the sealing lips against the cylinder bore. At Carlock Sealing, we optimize the outer lip geometry to ensure an immediate response to pressure fluctuations, providing a robust seal that minimizes bypass leakage in reciprocating industrial cylinders.
Q: Can I use a single non-preloaded lip seal for bi-directional pressure?
A: No. Lip seals are inherently uni-directional. For bi-directional piston applications, Carlock Sealing recommends installing two lip seals back-to-back, or choosing our Coaxial PTFE Piston Seals or Compact Piston Seals designed for dual-pressure service.
Q: Why choose non-preloaded designs for my piston?
A: These seals offer the lowest breakout friction in the lip seal family. If your application involves stable pressures and standard temperatures, Carlock Sealing’s non-preloaded U-cups provide a highly reliable and cost-effective sealing solution without the added complexity of metal springs or extra energizers.
Technical Disclaimer: Non-preloaded seals rely on material elasticity to maintain initial contact. In low-pressure or zero-pressure conditions, slight bypass may occur if the material has taken a compression set. For critical zero-leakage piston applications, consider Carlock Sealing's preloaded or spring-energized designs.
