Elmo Rietschle's S-Series VSI Twister screw vacuum pump represents modern, state-of-the-art dry running vacuum technology that is not only extremely energy efficient and reliable but offers a low life cycle costs. It is used in a variety of industrial applications such as drying and packaging.

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The VSI Twister dry running vacuum pumps with contact-free screw design are primarily used in the chemical and pharmaceutical industries for processing applications. With no lubrication in the pumping chamber, contamination with oil or other operating liquids is impossible.