Peter Fairbrother wrote in message
...


Quimby expanders are good for tolerance requirements, as the pressure
difference is split between several seals.

If the shafts aren't parallel then more work can be extracted as well.
Another way is to vary the depth, groove/land ratio, or the pitch.*


--
Peter Fairbrother


Where could I find info on Quimby expanders? Google coughed nothing up on them.

Thanks, TDP