High-Temperature Metal-To-Metal Sealing Has Graphite At Its Heart
01 August 2004
Garlock sealing Technologies has developed a metal-to-metal seal method
for duties involving temperatures of up to 1,000oC, without imposing
undue seating loads. In addition to its high temperature tolerance,
Ultraseal's die-formed graphite core provides good 'spring-back' and
deflection properties. This graphite ring is controlled by two metal cups
moving axially relative to one another during seal compression. The ring
and cup assembly is hermetically sealed by laser-welding to prevent
oxidation of the graphite at elevated temperatures, and the whole
assembly is then sealed within an 'envelope' of the actual sealing
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.
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