The volumetric lobe vacuum pumps “B” series are machines that, thanks to the conjugated rotation without contact of two rotors (with two lobes) within a suitably shaped chamber, create volumes and transfer air through the inlet manifold to the outlet one. They operate completely dry without any lubrication or residues generated by brushing or contact during rotation. These pumps do not actually compress the gas they elaborate, but transfer it from the inlet mouth to the outlet one.

In the vacuum sector, the volumetric lobe vacuum pumps should always be inserted in series with other pumps, normally of a lower flow, known as primary pumps (“L” series lubricated pumps). This way the unit (“CBL” pumping systems) is capable of:

  • achieving extremely low-end pressure levels (normally 10 times lower than what can be achieved with just the primary pump);
  • accelerating the emptying times of a closed volume.

As the primary pump flow is normally lower than that of the lobe pump, it is clear that, in the presence of insufficiently rarefied air, the volumetric pump could transfer an amount of air greater than the primary pump is capable of elaborating and this, as well as damaging it, can cause overheating and a subsequent seizure of the lobe pump.

For setting up the CBL groups, DVP uses volumetric lobe vacuum pumps with AdaptShield technology. These systems reach best volumetric efficiency and self-adapt to working conditions. AdaptShield technology guarantees a high level of protection against failures.





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