Direct Drive Pump 8925

List Price:

$3,950.00

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Product Details

  • Deep Vacuum
  • Portable with small footprint
  • Vacuum to 1 X 10-4 torr

Suggested Applications

Welch Direct-Drive Rotary Vane Vacuum Pumps achieve vacuum levels down to 1x10-4 torr (0.1 micron) with flows up to 11.3 CFM. These compact, portable oil-seal pumps are recommended for a variety of laboratory applications. Vacuum system configuration with a cold trap is recommended for use with harsh chemicals. Direct drive pumps are not recommended for filtration, aspiration, drying electrophoresis gels, or other applications requiring sustained operation above 30 torr.


Product Family Specifications

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Model Number 8905 8907 8912 8917 8920 8925 CRVpro4 CRVpro6 CRVpro8
Applications Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines Centrifugal Concentrators, Vacuum Ovens, Freeze Dryers, SEM's, Annular Spaces / Transfer Lines
Type Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump Laboratory Vacuum Pump
Free Air Displacement cfm (l/min.) @60Hz 1.8(51) 2.6(73) 3.8(108) 6.1(173) 7.7(218) 11.3(320) 2.8 (78) 4.2 (118) 5.6 (158)
Free Air Displacement m3/hr (l/min.) @50Hz 2.6(43) 3.7(61) 5.4(90) 8.6(144) 10.9(182) 16(267) 4 (67) 6 (100) 8 (133)
Ultimate Pressure 2 x 10-3(0.0027) 1x10-4(0.00013) 1x10-4(0.00013) 1x10-4(0.00013) 3 x 10-4(0.0004) 4 x 10-4(0.00053) 4 x 10­­⁻⁴ torr (5 x 10­­⁻⁴ mbar) 4 x 10­­⁻⁴ torr (5 x 10­­⁻⁴ mbar) 4 x 10­­⁻⁴ torr (5 x 10­­⁻⁴ mbar)
Sound Level 52 50 50 50 54 55 50 DbA 50 DbA 50 DbA
Pump RPM 3450 1725 1725 1725 1725 1725 1740 1740 1740
Oil Capacity 0.42(0.4) 1.0(0.95) 0.9(0.86) 0.9(0.86) 1.3(1.2) 1.2(1.1) 1.2 Qt (1150 ml) 1.2 Qt (1150 ml) 1.1 Qt (1000 ml)
Motor Horsepower (watts) 1/4(190) 1/2(370) 1/2(370) 1/2(370) 3/4(560) 3/4(560) 0.4 HP (0.3 kW) 0.4 HP (0.3 kW) 0.4 HP (0.3 kW)
Tubing Needed 3/16, 7/16 (5, 11) 7/16, 13/16 (11, 20) 7/16, 13/16 (11, 20) 7/16, 13/16 (11, 20) 9/16, 13/16 (14, 20) 9/16, 13/16 (14, 20) 5/8" to 3/4" ID Vacuum Hose 5/8" to 3/4" ID Vacuum Hose 5/8" to 3/4" ID Vacuum Hose
Intake Thread NPT UNIBARB (3/4-20) UNIBARB (1 1/8-20) UNIBARB (1 1/8-20) UNIBARB (1 1/8-20) UNIBARB (1 1/8-20) UNIBARB (1 1/8-20) NW16; Hose Barb on -01 Models NW16; Hose Barb on -01 Models NW16; Hose Barb on -01 Models
Exhaust Thread NPT 3/4/20 1-20 1-20 1-20 1-20 1-20 NW16 NW16 NW16
Overall Dimensions LxWxH in. (cm) 14.5x5.1x8.4 (36.8x13x21.3) 18.5x6.5x9.6 (47.1x16.5x24.3) 18.5x6.5x9.6 (47.1x16.5x24.3) 18.5x6.5x9.6 (47.1x16.5x24.3) 20.5x7.1x10.7 (52.1x17.9x27.2) 21.2x7.1x10.7 (53.817.9x27.2) 18.2 x 6.1 x 9.1 (46.3 x 15.7 x 23.0) 18.2 x 6.1 x 9.1 (46.3 x 15.7 x 23.0) 18.2 x 6.1 x 9.1 (46.3 x 15.7 x 23.0)
Ship Weight 33(15) 55(25) 55(25) 60(27.3) 71(32.3) 74(33.6) 61.8 lbs (28 kg) 49 lbs (22 kg) 63.9 lbs (29 kg)
Shipping Carton Dimensions LxWxH in. (cm) 21.5x12.5x16 (54.6x31.8x40.6) 24x15.8x14 (61x40.1x35.6) 24x15.8x14 (61x40.1x35.6) 24x15.8x14 (61x40.1x35.6) 24x15.8x14 (61x40.1x35.6) 24x15.8x14 (61x40.1x35.6) 22.3 x 13 x 13 (57 x 33 x 33) 22.3 x 13 x 13 (57 x 33 x 33) 22.3 x 13 x 13 (57 x 33 x 33)
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