Oops, sorry, missed your other question. I think any pump that has an impeller that spins would be considered centrifugal. I don't know what a positive displacement pump is but if I would hazard a guess I would think that we're talking about piston-type or peristaltic-type pumps where a set volume of fluid is drawn in and then physically pushed out.
So anyhow unless I'm way off I would say your Mag drive is a centrifugal pump.
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-- Tony
My next hobby will be flooding my basement while repeatedly banging my head against a brick wall and tearing up $100 bills. Whee!
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