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Welch™ DuoSeal™ High-Vacuum Pumps

Rugged, durable pumps are ideal for demanding applications such as Schlenk drying lines, freeze drying, vacuum distillations, concentrating and degassing

Manufacturer:  Welch™ 1402B01

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Catalog No. 01-100

Includes: V-belts, pulleys, belt-guard, oil supply, 3-wire cord (except 01-105-1 which must be conduit wired), plug, inline switch and instructions.



The ruggedness is a result of reduced frictional wear (less than 580rpm vs. typical 1750rpm direct-drive pumps) and high contamination tolerance (contaminants diluted due to large oil capacity).

  • Dual-voltage models come wired for lowest voltage listed in specifications chart; may be converted to higher voltage listed by rewiring
  • Wiring diagram supplied with each model
  • All models are single phase

1International Model for 115/230V 50Hz available on special order.



1 x 10-4 torr
128 lb.
8.8/4.4 A
525 rpm
58 kg
60 Hz
38.1 cm
51 cm
High Vacuum Pump, Two-Stage
1 x 10-4 torr
0.5 hp
58 kg
V-belts, pulleys, belt guard, Oil supply, 3-wire cord, N. American 115V plug, inline switch and instructions
115/230 V 60 Hz
128 lb.
5.6 CFM
15 in.
20 in.
12 in.
Concentrating and Degassing,Freeze Drying,Schlenk Drying Lines,Schlenk drying lines, freeze drying, vacuum distillations, concentrating and degassing,Vacuum Distillations
115/230 V


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