Welch Vacuum 2047 Dryfast & Dryfast Ultra - Manual (Page 12)

Section 5: APPLICATION
5.10 Operation as a Replacement for Aspirators
Models 2014, 2032, 2034, 2037, 2042, 2044 and 2047 are ideal for replacing common water
aspirators used for vacuum distillation/extraction fi ltration, degassing, low pressure source and/
or gas transfer. The six basic models are available with free air displacements from 25 to 70 L/
min and vacuum to 29.85 inches of Hg. water aspirators have been the researchers’ traditional
source of rough vacuum to 28.5”Hg (36 Torr) and pumping speed up to 20 L/min. Compare
the pump down curves for Models 2037 and 2047 to a standard water aspirator. See the table
below to cross reference the correct Welch Dry Vacuum pump with your water aspirator.
5.20 Cross Reference Welch Dry Vacuum Pump with your Water Aspirator
Style of
Aspirator Pump
Water Flow
(gal/min)
Water Pressure
1 (PSIG)
Matching Welch Dryfast Pump
Catalog Number
Welch Pump Replaces up to:
Plastic
or
Metal
2 30
2014, 2032, 2042, 2034, 2044
2037
2047
2 Aspirators
3 Aspirators
4 Aspirators
Note:
1. Common water pressure found when using water aspirator. Water pressure drops as more
water aspirators are turned on leading to poor vacuum for all.
2. Higher water fl ow rates and/or higher water pressure will increase the pumping speed and
ultimate pressure of a water aspirator.
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