This Welch 7 DirecTorr 8920A Vacuum Pump is in used condition, has been tested and is guaranteed to be functional. This unit came from a local lab that had surplus equipment and shows normal signs of use. Pump will require a filter and oil (not included). We urge customers to view all photos as they show overall condition, included accessories and useful information. Please feel free to contact us with any questions.


The Welch CRVpro series is the latest innovation in the high vacuum, direct-driven vacuum space. Vacuum users can expect increased reliability and longer service live when compared to other direct drive, rotary vane vacuum pumps.

  • Consumes up to 36% less oil than comparable pumps
  • Runs 10°C cooler than comparable pumps. This reduced the degradation of vacuum pump oil, increasing the running time between service intervals.
  • Has a 40% larger oil capacity than comparable pumps. Dilutes aggressive chemicals.
  • Has a chemical resistant coating in the oil case and pump module. Protects non-moving parts.

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The Welch 8920A Direct Drive vacuum pump is a robust vacuum pump for applications requiring pressures < 1 Torr. The 8920A achieves < 0.001 Torr with a pumping speed of 218 liters/min (7.7 CFM).    

Two stage, oil sealed vacuum pumps should not be operated continuously at pressures above 1 Torr. Operating this vacuum pump at higher pressure will induce excessive oil spraying from the exhaust of the vacuum pump causing premature failure and void warranty. Please consult your Chemtech Scientific Representative for consultation, should the ultimate pressure of your process run above 1 Torr.
Common accessory, not included Exhaust Filter
Pumping Speed 7.7 CFM (218 Lit/min.)
Max. Vacuum 0.001 Torr
Oil Capacity 1.3 qts
Tubing Needed Accepts 9/16" or 3/4" ID Hose
Inlet Connection Unibarb 1 1/8 -20
Intake / Exhaust threads 1-20
Pump RPM @ 60 hz 1725
Dimensions LxWxH 20.5x7.1x10.7 inches

Wiring Wired for 115v, 60 Hz, 1 ph with N. American 115v Plug