How does the Arrow-hook split seal work?

How does the Arrow-hook split seal work?

AIGI has taken double split rotary seal design to a new level with the introduction of its patented arrowhook™seals.
These technologies allow for the incorporation of two independent seal surfaces into the design which dramatically improves sealing performance.
The duo-lock design improves the overall elasticity of the seal while the wedge cutting technology significantly upgrades the integrity of the split joint.
However, the arrowhook split, duo-lock and four rings design requires a high installation technology. Check the following video to see how it is installed:

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