Disc Wear in the Björk-Shiley Tilting Disc Valve

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Abstract
A more durable carbon has been tested in a Kay-Shiley disc valve, but demonstrated a too pronounced strut wear to be acceptable. A Bjork-Shiley valve with a pyrolytic carbon disc is under investigation. Furthermore, a thicker-edged delrin disc would produce a significantly more marked strut wear than the standard delrin disc. In the Bjork-Shiley tilting disc valve, evidence from in vivo cycling indicates a disc rotation, either as a random change of orientation or a more consistent rotation. This disc rotation provides a more even distribution of wear and gives a disc lifetime of significantly more than 20 to 30 years.

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