Metal-to-metal seal is hot stuff
A
Garlock (Great Britain) product story
Edited by the Engineeringtalk editorial team
May 11, 2004
A novel metal-to-metal seal concept enables service temperatures of 1000C to be achieved with low seating loads.
A novel metal-to-metal seal concept enables service temperatures of 1000C to be achieved with low seating loads.
Achieving high sealing tightness at ultra-high temperatures, Ultraseal extends the design boundaries for engineers normally constrained by the need for bulky high-load bearing flanges.
Ultraseal's construction is based around a graphite core which provides excellent "spring back" and deflection properties as well as an ability to withstand temperatures beyond 1000C.
The die formed graphite ring is controlled by two metal cups moving axially relative to one another during seal compression.
The graphite ring and metal cup assembly is encapsulated by hermetically laser-welding to prevent any risk of high temperature oxidation (the reason exposed graphite's upper temperature limit is substantially reduced).
The whole assembly is then sealed within an "envelope" of the actual sealing substrate, depending on the application.
The sealing function relies on the ridges machined on the external face of the spring metal cups acting through the sealing envelope.
This concentrates the seating load over a limited contact area, thus maximising seating stress.
The result of a three year European collaboration involving CEA (the French Atomic Energy Commission), Garlock and six other R and D and industrial partners, Ultraseal is aimed at meeting the design needs of engineers within the power generation, chemical, petrochemical and aerospace industries.
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