Leybold presents dry screw vacuum pumps DRYVAC DV 500 and DV 800 The new screw vacuum pumps DRYVAC DV 500 and DV 800 will be presented by Leybold in spring 2021. These vacuum pumps compress completely dry, i.e. without operating lubricant in the compression chamber and are therefore ideally suited as backing pumps in food packaging or in pumping sets in heat treatment or coating systems, as...