Scroll vacuum pumps consist of both a set and an orbiting scroll. 
As the orbiting scroll movements, voids are created at the inlet of the pump, drawing in the gas. As the rotor additional moves, the gas is certainly steadily compressed until it really is discharged to atmosphere at the pump exhaust.
The scroll pump design provides 100% oil-free operation as it will not require any lubrication. The bearings are Scroll Vacuum Pump separated from the compression chamber so no contamination of the pumped gas is possible. In addition, the leak-tight design aids in preventing contamination of the pumped gas by ambient air. Maintenance is limited to changing the scroll suggestion seals which can be easily performed by the operator and with no need for special tools.