Roots pumps
Roots pumps for higher pumping speed
Roots pumps are installed upstream of a backing pump. They increase pumping speed where the backing pump is working close to its ultimate pressure, and allow a deeper vacuum.
Available with or without an internal bypass valve, on request in stainless steel, Hastelloy, bronze or aluminium.
Pumping speed
200 to 16,000 m³/h
Pumping chamber
no lubricant
Materials
special materials also available
ATEX
available
Features
- no lubricant in contact with the pumped gas
- contact-free, no wear in the pumping chamber
- with or without bypass valve
- Special materials and internal coatings
- Mechanical seals or labyrinth seals
- resistant to gases and vapours
Application
As a stage upstream of rotary vane, screw or liquid ring pumps in process industry vacuum systems.
Technical data
GV series
| Type | Pumping speed | Speed | Max. differential pressure in continuous operation | Motor power | Cooling water consumption | Oil quantity | Weight with oil and motor |
|---|---|---|---|---|---|---|---|
| [m³/h] | [rpm] | [mbar] | [kW] | [l/h] | [l] | [kg] | |
| GV 20.10 | 200 | 2850 | 130 | 0,75 | 60 | 0,7/1,0 | 73 |
| GV 20.20 | 280 | 2850 | 80 | 1,1 | 60 | 0,7/1,0 | 85 |
| GV 21.20 | 500 | 2860 | 80 | 2,2 | 80 | 1,1/1,6 | 130 |
| GV 21.30 | 740 | 2860 | 80 | 3,0 | 80 | 1,1/1,6 | 158 |
| GV 22.20 | 1000 | 2895 | 80 | 4,0 | 100 | 1,6/2,5 | 240 |
| GV 22.30 | 1430 | 2895 | 66 | 4,0 | 100 | 1,6/2,5 | 270 |
| GV 23.20 | 2000 | 2910 | 50 | 5,5 | 120 | 3,1/4,8 | 360 |
| GV 23.30 | 2880 | 2910 | 40 | 7,5 | 120 | 3,1/4,8 | 400 |
GNV series
| Type | Pumping speed | Speed | Max. differential pressure in continuous operation | Motor power | Cooling water consumption | Oil quantity | Weight with oil and motor |
|---|---|---|---|---|---|---|---|
| [m³/h] | [rpm] | [mbar] | [kW] | [l/h] | [l] | [kg] | |
| GNV 24.20 | 3725 | 2915 | 50 | 11 | 140 | 5,0/8,5 | 580 |
| GNV 25.10 | 5422 | 2925 | 66 | 15 | 160 | 7,5/12,5 | 755 |
| GNV 25.20 | 7295 | 2930 | 50 | 18,5 | 160 | 7,5/12,5 | 850 |
| GNV 26.20 | 7954 | 1460 | 50 | 22 | 180 | 16/27 | 1600 |
| GNV 26.30 | 9478 | 1460 | 40 | 22 | 180 | 16/27 | 1700 |
| GNV 27.10 | 11515 | 1465 | 40 | 30 | 200 | 27/35 | 2490 |
| GNV 27.20 | 15558 | 1465 | 30 | 30 | 200 | 27/35 | 2690 |
GNP series
| Type | Pumping speed | Speed | Max. differential pressure in continuous operation | Motor power | Oil quantity | Weight (free shaft end) |
|---|---|---|---|---|---|---|
| [m³/h] | [rpm] | [mbar] | [kW] | [l] | [kg] | |
| GNP 30.20 | 280 | 3000 | 800 | 7,5 | 1,0 | 90 |
| GNP 31.20 | 500 | 3000 | 800 | 18,5 | 1,6 | 125 |
| GNP 32.20 | 1000 | 3000 | 800 | 30,0 | 2,45 | 210 |
| GNP 33.20 | 2000 | 3000 | 800 | 55,0 | 4,8 | 330 |
| GNP 34.20 | 3000 | 2200 | 800 | 75,0 | 8,5 | 448 |
| GNP 35.20 | 4000 | 1800 | 800 | 132,0 | 12,5 | 675 |
| GNP 36.20 | 8000 | 1500 | 800 | 250,0 | 27,0 | 1380 |
| GNP 37.20 | 10000 | 1000 | 800 | 300,0 | 35,0 | 2442 |
GV-GNVP series
| Type | Pumping speed | Speed | Max. differential pressure in continuous operation | Motor power | Cooling water consumption | Oil quantity | Weight (free shaft end) |
|---|---|---|---|---|---|---|---|
| [m³/h] | [rpm] | [mbar] | [kW] | [l/h] | [l] | [kg] | |
| GV-GNVP 20.20 | 280 | 3000 | 400 | 4,0 | 60 | 1,0 | 90 |
| GV-GNVP 21.20 | 500 | 3000 | 400 | 7,5 | 80 | 1,6 | 125 |
| GV-GNVP 22.20 | 1000 | 3000 | 400 | 15,0 | 100 | 2,45 | 215 |
| GV-GNVP 23.20 | 2000 | 3000 | 300 | 30,0 | 120 | 4,8 | 335 |
| GV-GNVP 24.20 | 3000 | 2200 | 300 | 37,0 | 120 | 8,5 | 455 |
| GV-GNVP 25.20 | 4000 | 1800 | 300 | 55,0 | 140 | 12,5 | 682 |
| GV-GNVP 26.20 | 8000 | 1500 | 300 | 90,0 | 160 | 27,0 | 1385 |
| GV-GNVP 27.20 | 10000 | 1000 | 300 | 132,0 | 180 | 35,0 | 2450 |
Weight: GV and GNV series with oil and motor, GNP and GV-GNVP series with free shaft end.
Oil quantity: where two values are shown, both are stated this way on the data sheet.
Frequently asked questions
Is a backing pump needed?
Yes. The Roots pump does not work against atmospheric pressure but always together with a backing pump. We size the combination for you.
Is the pump available for potentially explosive atmospheres?
Yes. GEV also supplies rotary vane, screw, claw and Roots pumps to ATEX Directive 2014/34/EU, tested by TÜV NORD. Tell us the zone and the medium, and we will determine the right version.
Who supplies and services the pumps?
We do. As General Europe Vacuum’s representative in Switzerland, we supply pumps and spare parts, advise on sizing and handle maintenance and repairs.
Downloads
Which vacuum pump is right for you?
Pumping speed, ultimate pressure, medium and operating mode determine the choice. We size the pump with you, supply accessories and spare parts and take care of servicing.