Kalrez® TriLobe™ Seals

Article

DuPont has developed a unique seal design to improve seal life in dovetail grooves. This design benefits from the excellent chemical, thermal and plasma resistance of DuPont^™ Kalrez^® perfluoroelastomer parts with a unique cross-sectional trilobe seal that eliminates many of the problems associated with semi-dynamic seal applications using a dovetail groove. These problems include installation difficulties as well as short seal life and particle generation due to seal wear and degradation.

Features and Benefits

Molded notch makes installation a snap
Reduces installation time.
Avoids improper installation.
Geometry interlocks in groove to prevent seal from rolling and twisting during installation.
Bottom lobes lock seal in place to resist pullout and movement during actuation.
Seal parting lines are maintained below the flange surface, eliminating direct exposure to plasma or process chemicals.
Seal design and compound selection combine to yield reduced particle generation and significantly increase seal life.

Suggested Applications

Slit valve doors
Gate valves
Semi-dynamic sealing applications that utilize a dovetail groove configuration

Availability

Molds have already been developed for a number of common slit valve door seal part sizes.
A DuPont^™ Kalrez^® TriLobe^™seal can be developed to fit any size dovetail groove.
The Kalrez^® TriLobe^™ seal is available in a variety of compounds.

Ideas & innovations

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