The HeptaDry line of dry pumps from Pfeiffer Vacuum is very well suited for low- and medium-vacuum applications. These pumps are designed for all areas in which oil-free vacuum is required. Rugged and dependable, they offer pumping speeds of from 100 to 600 m3/h. HeptaDry pumps are suitable for use as stand-alone pumps for processes of up to 10–1 mbar. When used in combination with roots pumps, they supply an ultimate pressure of up to 5 x 10–3 mbar. One special advantage consists of their coated, single-piece, variable-pitch rotors. The internal compression makes for low energy consumption. And the innovative design and slow speed of these pumps is gentler to bearings and seals. High-quality axial face seals between bearings and suction chamber afford increased reliability.
cpp 415
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