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http://www.nordson.com/en-us/divisions/efd/Literature/Brochures-Data-Sheets/Dispensers/Air-powered/NordsonEFD-time-pressure-versus-positive-displacement

http://www.nordson.com/en-us/divisions/efd/Literature/Brochures-Data-Sheets/Dispensers/Air-powered/NordsonEFD-time-pressure-versus-positive-displacement
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Catalog excerpts

Let’s get to the point COMPONENTS MAKE A BIG DIFFERENCE The quality of dispensing components impacts the quality of your fluid deposit. Nordson EFD components are manufactured in the US from quality materials and subjected to stringent quality control. Photos on left are magnified to show common flaws in poor quality tips. Flash, burrs and other defects create inconsistent deposits and lead to more rejected parts. HUBS For Nordson EFD LLC sales and service in over 30 countries, contact EFD or go to www.nordsonefd.com Others. “Flash” inside tip hub restricts flow and reduces accuracy. Nordson EFD hubs provide unrestricted flow and produce accurate, consistent deposits. Others. Burrs and flaws inside reduce accuracy. Nordson EFD needles are carefully polished and burr-free.

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Time pressure offers many advantages over positive displacement TIME-PRESSURE POSITIVE DISPLACEMENT Accuracy / Performance Accuracy / Performance Real-time display of air pressure and dispense time reect actual dispensing parameters. Displacement value on display is a mathematical computation of how far the lead screw travels - not how much uid is displaced. Simple adjustments maintain accuracy as barrel empties. As barrel empties, lead screw pullback does not change so there is less uid compression and deposit consistency suffers. Components made in USA by Nordson EFD under stringent...

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