On Sun, 29 Jul 2007 18:33:40 -0400, "Roger Long"
wrote:


"David Scheidt" wrote


Why would there be? The seperation is done by gravity.

Undoubtedly. Someone else raised the minimum flow question which seemed
plausible to me only because of seeing spiral grooves on some of the bowl
housings that looked as if the centrifugal effects of flow might be intended
to assist gravity. Maybe so but it apparently isn't a big enough
contribution for Racor to warn against diminished performance at low flow
rates.

A more likely probabiliy now seems to me to be that the grooves are intended
to slow the flow so that gravity will have more time to do its work. I'm
skeptical now that there is a downside to a large filter.

The flow rate is fixed by the flow rate...as is the "time of flight"
from inlet to outlet. Perhaps they are making a vortex. Just a guess.