X-Mozilla-Keys:                                                                                 

Jon wrote:
One important and often overlooked consideration regarding any rotor
material
is the compatibility with the seal materials (coefficient of friction
and galling tendency).

Archie wrote:

Titanium is abrasive without some coating protection
or lubrication.
On valves, the bearing surface is usually plasma
applied molybdenum, or a bronzanium guide, or
preferably, both.  If movement exists between the Ti
rotor, and seal material, this should be taken into consideration.
Archie

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