Welch Vacuum 1402N Chemstar - Manual (Page 15)

HIGH EFFICIENCY PUMPING
CHARACTERISTIC OF DUOSEAL® PUMPS
The low RPM design of DUOSEAL vacuum pumps makes it possible to maintain high pumping effi ciencies into the low
micron range. High RPM direct drive vacuum pumps, on the other hand, experience a rapid fall off of pumping speed
below 100 microns.
A comparison of the DUOSEAL pumping speed curves shown below, versus high RPM pump speed curves conclusively
illustrates the superior performance of the DUOSEAL pump.
What does that mean for the vacuum pump user? DUOSEAL pumps provide considerable faster pump down time in the
low micron range.
Section 7: PUMPING SPEED CURVES
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