Welch Vacuum 1402 Duoseal Belt Drive - Manual (Page 15)

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Section 7: PUMPING SPEED CURVES
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.