I like these mag-drive gear pumps. I've used with great success. Product data page of their website is
http://www.pulsafeeder.com/literature/litbyproductline.asp?prodline=Eclipse&EPSP=EPO
Non-pulsing flow (like with peristaltic pumps) is eliminated, and no danger if hose/tube fails.
You...
Working on a project requiring very high motor efficiency. In reviewing motor selections, I notice with changes in the number of poles in asynchronous motors, PF changes. Can anyone explain why?