Oil-lubricated or dry running
Elmo Rietschle makes its V-Series rotary vane vacuum pumps in two kinds, according to its website: oil-lubricated pumps such as the V-VCS, which use oil to seal and reach deeper vacuum, and dry running pumps such as the V-VTN and V-VTR, designed to operate without oil lubrication.
Sources: Elmo Rietschle, Rotary Vane Vacuum Pumps and Elmo Rietschle, Oil-Lubricated Rotary Vane Pumps.





