Technology
Roots vacuum pumps
Also called vacuum boosters: dry and contact-free for high pumping speeds, usually together with a backing pump. 134 current models from 6 manufacturers ā comparable by pumping speed and rated motor power.
Compare 134 modelsHow the technology works
- 134models
- 21series
- 6manufacturers
- 44,300 mĀ³/hhighest pumping speed (50 Hz)
Touch the points: the parts explain themselves.
Manufacturers and series
6 manufacturers, 21 series
Each series leads to its page with all models. āShow only ā¦ā sets the filter of the product overview.
Atlas Copco
11 models Ā· 253ā4,140 mĀ³/h
Becker
3 models Ā· 500ā2,000 mĀ³/h
Busch
26 models Ā· 250ā12,000 mĀ³/h
Edwards
24 models Ā· 30ā44,300 mĀ³/h
Leybold
28 models Ā· 25ā4,700 mĀ³/h
Pfeiffer Vacuum
42 models Ā· 14ā13,540 mĀ³/h
Product overview
Compare all 134 models
The filters on the left narrow down the selection by the key figures of the models ā for 50 or 60 Hz.
Atlas Copco DRB series 4 models
DRB 250Pumping speed 253 mĀ³/h 50 Hz304 mĀ³/h 60 HzUltimate pressure Rated motor power 1.1 kW 50 Hz1.1 kW 60 HzVariants 2Atlas Copco DRB VSD+ series 2 models
Atlas Copco ZRS series 5 models
Becker RBP series 3 models
Busch PANDA/PUMA series 26 models
Edwards EH series 5 models
Edwards GMB series 2 models
Edwards HV series 1 model
Edwards nXLi series 7 models
Edwards nXRi series 5 models
Edwards Stokes series 4 models
Leybold ECODRY series 5 models
Leybold RUVAC WA/WAU series 8 models
Leybold RUVAC WH/WHU series 7 models
Leybold RUVAC WS/WSU series 8 models
Pfeiffer Vacuum A4 series 12 models
Pfeiffer Vacuum A 100/200 L series 3 models
Pfeiffer Vacuum ACP series 4 models
Pfeiffer Vacuum HiLobe series 17 models
Pfeiffer Vacuum TORRI series 4 models
Pfeiffer Vacuum UltiDry series 2 models
No model matches these filters.
Atlas Copco DRB series 4 models
Atlas Copco DRB VSD+ series 2 models
Atlas Copco ZRS series 5 models
Becker RBP series 3 models
Busch PANDA/PUMA series 26 models
Edwards EH series 5 models
Edwards GMB series 2 models
Edwards HV series 1 model
Edwards nXLi series 7 models
Edwards nXRi series 5 models
Edwards Stokes series 4 models
Leybold ECODRY series 5 models
Leybold RUVAC WA/WAU series 8 models
Leybold RUVAC WH/WHU series 7 models
Leybold RUVAC WS/WSU series 8 models
Pfeiffer Vacuum A4 series 12 models
Pfeiffer Vacuum A 100/200 L series 3 models
Pfeiffer Vacuum ACP series 4 models
Pfeiffer Vacuum HiLobe series 17 models
Pfeiffer Vacuum TORRI series 4 models
Pfeiffer Vacuum UltiDry series 2 models
Models that a manufacturer no longer carries in its current range are not part of this overview; they are listed in its āOutdated modelsā section ā for example under outdated Leybold models.
Operating principle
How a Roots vacuum pump works
Two Roots rotors turn in opposite directions in the housing without touching each other or the housing; a gearbox synchronises them. Between rotor and housing wall the gas is carried from the inlet to the outlet without the volume of the cell changing. Compression only takes place at the outlet ā against the higher pressure that prevails there.
The drawing shows the basic principle. The designs of the individual manufacturers differ in detail.
- SuctionThrough the inlet (A) the gas flows into the cell (D) that a Roots rotor (C) forms with the housing (B).
- TransportThe following rotor lobe cuts the cell off from the inlet. The gas is carried to the outlet without compression.
- DischargeAt the outlet (F), gas flows from the discharge side into the cell and compresses its contents; the rotors then push the gas out.
Key figures
The technology in figures
The ranges result from the current models in our range.
Pumping speed (50 Hz)
14 to 44,300 mĀ³/hin our range
Rated motor power (50 Hz)
0.85 to 18.5 kWin our range
Ultimate pressure: a question of the combination
Roots vacuum pumps usually work together with a backing pump. The ultimate pressure that can be reached then depends on the combination; many manufacturers therefore do not state it for the individual pump. Where a manufacturer does state an ultimate pressure ā for example for multi-stage Roots pumps that compress against atmosphere ā it is given in the product overview.
What characterises the technology
With a backing pump
Together with backing pumps, Roots vacuum pumps cover a wide range in which high pumping speeds are required.
Dry and contact-free
In the working chamber there is neither oil nor water as a sealing medium. In most models only the timing gear and the bearings are lubricated with oil.
Bypass valve
Some models have an automatic bypass valve that limits the pressure difference between inlet and outlet.
Multi-stage designs
Multi-stage Roots pumps compress against atmosphere in several successive stages and work without a backing pump.
Advantages
What speaks for this technology
- High pumping speeds
- Dry-running
- Robust and economical
- Reliable and heavy-duty
- Modular design
- Available as individual units
- Comprehensive range of accessories
- Frequency control possible
Applications
Where they work
- General industryextraction systems, drying, process engineering applications, vacuum conveying
- Environmental technologyextraction systems, drying systems, gas circulation
- Pumping stationsin combination with a backing pump, for example a rotary vane or screw pump
Frequently asked questions
Questions about Roots vacuum pumps
How does a Roots vacuum pump work?
Two Roots rotors turn in opposite directions and without contact in the housing. They carry the gas in the cells between rotor and housing wall from the inlet to the outlet; compression only takes place there, against the higher pressure of the discharge side. The drawing in the section Operating principle shows every step.
Does a Roots vacuum pump need a backing pump?
As a rule, yes: the classic Roots pump is designed for operation with a backing pump, for example a rotary vane pump or a screw pump. Multi-stage Roots pumps, by contrast, compress against atmosphere themselves.
Roots pump or vacuum booster ā what is the difference?
There is none: both terms describe the same design.
From which manufacturers does Ehrler & Beck carry this technology?
Currently from Atlas Copco, Becker, Busch, Edwards, Leybold and Pfeiffer Vacuum. The series are listed in the section Manufacturers and series.
How do I find the right model?
In the product overview, the filters narrow down the selection by the key figures of the models. For sizing, it is best to tell us the gas to be conveyed, the working pressure and the flow rate you need ā we will be glad to advise you.
What do the figures for 50 Hz and 60 Hz mean?
Flow rate and rated motor power depend on the mains frequency. The overview therefore shows both values wherever the manufacturer states them, and the size filters can be switched between 50 Hz and 60 Hz.
Does Ehrler & Beck also supply spare parts and service?
Yes. Ehrler & Beck offers original spare parts and accessories as well as maintenance and repair.
Which model fits your process?
Tell us the gas to be conveyed, the working pressure and the flow rate you need ā we will advise you on selection, spare parts and service.
