Scroll vacuum pumps contain both a fixed and an orbiting scroll. As the orbiting scroll movements, 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 is Scroll Vacuum Pump discharged to atmosphere at the pump exhaust.
The scroll pump design provides 100% oil-free operation as it does not require any lubrication. The bearings are separated from the compression chamber therefore 
no contamination of the pumped gas can be done. Furthermore, 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 completed by the operator and without the need for special tools.