Scroll Pumps
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Scroll vacuum pumps are oil-free, dry vacuum pumps that generate vacuum without oil in the pumping mechanism, helping prevent oil contamination and back-streaming. Welch scroll pumps are suited to laboratory, analytical and industrial applications where clean vacuum, low maintenance and reliable performance are important.
Choosing a scroll pump+
A scroll vacuum pump uses two interleaved spiral scrolls to compress gas and generate vacuum without oil in the pumping chamber. This oil-free design helps maintain a clean vacuum while eliminating oil changes associated with oil-sealed pumps.
When comparing models, consider:
- Pumping speed
- Ultimate pressure
- Noise level
- Power and voltage requirements
- Inlet connection size
- Cooling and operating range
For example, the Welch SCSpro 15 dry scroll pump delivers up to approximately 280 L/min pumping speed and an ultimate vacuum near 0.012 Torr.
Applications & uses+
Scroll pumps are commonly used for laboratory systems, analytical instruments, backing turbomolecular pumps, freeze dryers, glove boxes and Vacuum Oven applications where a clean, oil-free vacuum is required.
Compared with Direct Drive Rotary Vane Pumps, scroll pumps eliminate oil maintenance and the risk of back-streaming. For applications involving solvents or aggressive vapors, consider whether a Chemical Duty Diaphragm Pump may be more suitable.
If your process includes cold traps or condensable vapors, features such as air-flush systems can help maintain performance. For routine maintenance, see our Service Kits and Accessories categories. Applications such as Rotary Evaporation may also benefit from clean, oil-free vacuum technology.
FAQs+
What is a scroll vacuum pump?
It is a dry, oil-free vacuum pump that uses two spiral scrolls to move and compress gas from inlet to exhaust, producing a clean vacuum without oil in the pumping mechanism.
Are scroll vacuum pumps oil-free?
Yes. Scroll pumps do not use oil in the pumping chamber, which avoids oil contamination and back-streaming and removes the need for oil changes.
How does a scroll vacuum pump work?
One scroll orbits within a second fixed scroll. As it moves, it traps pockets of gas at the inlet and carries them inward, compressing the gas and expelling it at the exhaust, which generates vacuum.
What are scroll vacuum pumps used for?
They are used where a clean, oil-free vacuum is needed, including laboratory and analytical systems, backing turbomolecular pumps, freeze dryers, glove boxes, vacuum ovens and industrial processes.
What vacuum level can a scroll pump reach?
Scroll pumps can reach vacuum levels comparable to oil-sealed rotary vane pumps. The Welch SCSpro 15, for example, reaches an ultimate vacuum near 0.012 Torr. Check the specification for the specific model.
What maintenance does a scroll vacuum pump need?
Because they are dry, scroll pumps do not require oil changes. Maintenance typically involves periodic replacement of tip seals and other wear components according to the manufacturer's recommended service intervals.
Scroll pump vs rotary vane pump: what is the difference?
A scroll pump is oil-free and provides a clean vacuum without oil maintenance. A rotary vane pump is oil-sealed and can achieve deeper vacuum levels but requires oil changes and ongoing oil management. The best choice depends on cleanliness requirements and vacuum performance needs.