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Hybrid configuration is designed after considering all the prospects of the process, like two stage liquid ring vacuum pumps are ideal for a variety of industrial applications and may be combined with ejectors or boosters to form hybrid packages, allowing higher vacuum levels.
Similarly, dry vacuum pump or oil sealed vacuum pump are configured with vacuum booster for high vacuum and high flow rate.
Combination vacuum pumps, also known as hybrid vacuum pumps, have both a rotary vane and diaphragm pump together in the same vacuum pump.
In a combination pump the diaphragm pump keeps the oil of the rotary vane pump under negative pressure to reduce or eliminate vapors going through it and condensing in the oil.
This design keeps the oil cleaner and allows for less frequent changing – oil lasts up to 10 times longer between changes compared to rotary vane pumps.
So while there may be a higher up-front cost than an rotary vane pump, the operation costs are lowered as less replacement oil is needed and less time is lost changing the oil.
The ultimate vacuum level and displacement capacity with combination pumps is similar to those of rotary vane pumps.
Because the diaphragm pump is incorporated into the design, these pumps are better at handling acids and solvents than rotary vane pumps.
Combination pumps are recommended for freeze drying corrosive or volatile samples as they can be used with acidic samples and those containing harsh chemicals.
Steam ejectors and liquid ring vacuum pumps have advantages and disadvantages in any given process application.
In some cases, the disadvantages of using one over the other make it difficult to make the best overall vacuum equipment selection to meet even the most basic process requirements.
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