Scroll vacuum pumps consist of both a set and an orbiting scroll. As the orbiting scroll moves, voids are manufactured at the inlet of the pump, drawing in the gas. As the rotor additional moves, the gas is usually 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 separated from the Scroll Vacuum Pump compression chamber therefore no contamination of the pumped gas is possible. In addition, the leak-tight design helps prevent contamination of the pumped gas by ambient air. Maintenance is limited to changing the scroll tip seals which 
may be easily completed by the operator and with no need for special tools.