With the new oil-free DSS scroll vacuum pump, Atlas Copco is expanding its range of dry industrial pumps. The robust, low-wear pump is particularly suitable for vacuum generation in the rough vacuum range. A key feature of the innovation is its simple and effective operating principle for gas handling. Inside the pump there are two intermeshing, spiral-shaped screws made of aluminium. One spiral screw is fixed, while the second one rotates to compress the gas inclusions.