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Welch™ Direct-Drive High-Vacuum Pumps: Model 8907

Compact, portable, two-stage direct-drive pumps suitable for vacuum ovens, freeze dryers, concentrators, and chambers

Manufacturer: welch™  8907A

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Catalog No. 01-257-11

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Description & Specifications


Horsepower 0.5hp
Voltage 115V
Hertz 60Hz
Height (English) 9.62 in.
Height (Metric) 24.3cm
Width (English) 6.5 in.
Width (Metric) 16.5cm
Length (English) 18.5 in.
Length (Metric) 46.9cm
Shipping Weight (English) 46 lb.
Shipping Weight (Metric) 21kg
Amperage 4.6A
Includes Line cord, switch, plug and vacuum Oil, integral isolation valve
Motor Speed 1725rpm
Pressure 1 x 10-4 torr
Certifications/Compliance CSA
Flow Rate 2.6 cfm
For Use With (Equipment) Vacuum ovens, freeze dryers, concentrators and chambers
Electrical Requirements 115V 60Hz
Dimensions (L x W x H) 18.5 x 6.5 x 9.62 in. (46.9 x 16.5 x 24.3cm)
Capacity (English) 17 gal./min.
Capacity (Metric) 64L/min.
For Tube Size (English) 0.56, 0.81 in.
For Tube Size (Metric) 1.1, 2cm
Model 8907
Noise Level 50dBA
Type Direct-Drive High-Vacuum Pump
Weight (English) 40 lb.
Weight (Metric) 18.1kg
Dimensions (L x W x H) Exterior 18.5 x 6.5 x 9.62 in. (46.9 x 16.5 x 24.3cm)
Width (English) Exterior 6.5 in.
Height (English) Exterior 9.62 in.
Height (Metric) Exterior 24.3cm
Length (Metric) Exterior 46.9cm
Width (Metric) Exterior 16.5cm
Length (English) Exterior 18.5 in.

All models are an efficient two-stage design for continuous high vacuum operation. Use gas ballast valve to prevent condensation of vapors and to remove water vapor contamination from oil reservoir. Not for continuous operation at pressures above 10 torr.

  • Available in pumping ranges of 1.8 to 11.3cfm (51 to 320L/min.)
  • Ultimate pressure to 1 × 10-4 torr (based on model)
  • Aluminum UNIBARB™ style inlet connector accepts two sets of tubing I.D. (3/16 to 13/16 in. [5 to 20mm]) and has a screen
  • Outlet connector has a 1-20 thread (Model 8905A has a 3/4-20 outlet connector thread)
Models 8907
Include integral isolation valve to prevent oil and air contamination of the system in the event of a power failure.