Machine Design

Seals for Exhaust Valves

Exhaust gases can form a sticky gum or hard deposits that often cause premature seal or bearing failure.

One solution are double-delta seals that use of PTFE components riding energized by an O-ring. The O-ring creates a balance between the desired leakage, friction, and response time. Glyd Ring II seals reduce tolerance stack-up and its elastomer is bonded to the PTFE. In the final seal, the Variseal, the elastomer is replaced with a slant coil spring that energizes the seal, thus making sealing friction more consistent.

Trelleborg Sealing Solutions, 510 Burbank, Broomfield, CO 80020, (303) 465-1727,

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