Non-contacting labyrinth seals deliver leakage reduction in centrifugal applications, restricting flow through a sequence of chambers formed between the rotating element and the teeth to control the passage of media. Traditional metallic labyrinth seals require large clearances to avoid potential heat generation, deformation and galling that reduce efficiency and component life. Metallic labyrinth seals also suffer from corrosion and erosion damage in high acid or mercury and high velocity environments.
Greene, Tweed’s Arlon® 4020 labyrinth seals deliver superior performance by combining custom-engineered tooth designs and high-performance thermoplastic materials. Our solution incorporates a tooth profile with outstanding dimensional stability, allowing for a cyclic flex-and-return motion to withstand contact during critical speeds. This allows for tighter clearances, dramatically increasing efficiency and reliability for longer run times. The engineered tooth profile also creates a more controlled flow pattern, further
increasing efficiency by encouraging vortex generation and reducing “carry-over” media that can bypass chambers – especially in high velocity applications.
Arlon 4020’s excellent tribological properties reduce friction and wear during contact, eliminating gall to extend seal life and reduce maintenance costs. The material’s enhanced corrosion and erosion resistance make it ideally suited to severe sealing applications including high acid or mercury contents and high velocity media. The superior thermal expansion of Arlon 4020 allows for tight clearances at operating temperatures while maintaining the generous clearances of conventional metallic seals during ambient installation. This allows for retrofit and like-for-like replacement utilizing the same assembly techniques.
Labyrinth seals for centrifugal compressors and dry gas seals in: