Gas circulation pumps are oil-free rotary vane pumps for small and medium volume flows in laboratory, small-scale production and for process applications up to 60 m³ / h. They are usable for delivering of aggressive gases and gas mixtures, hot or radioactively contaminated gases, in high-pressure processes, but also used for high-purity gases and as bypass pump for gas analysis systems. Hermetically sealed, leak-free by magnetically coupled drive technology. High-quality material selection in stainless steel and Hastelloy, ceramic and tungsten carbide (carbide) for maximum chemical resistance and wear resistance. Pump selection for system pressures up to 400 bar and temperatures up to 300 ° C. Available with heated pump head and split case and in atex conforming construction.