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The FreFlow range of self-priming centrifugal pumps are suited to chemical and pharmaceutical applications to transfer low viscosity, contaminated liquids or those containing gas or air. They are based on the injection principle, with a semi-open or closed impeller and a mechanical seal in the oil chamber. The self-priming ability prevents the pumpfrom running dry and eliminates the need for a separate vacuum pump or associated equipment. A non-return valve is not needed, in combination with a back pull-out system and an inspection cover, this ensures easy maintenance as the pump does not need to be disconnected and removed from the pipework. An oil chamber is located behind the mechanicalseal which lubricates the seal faces when priming. The FreFlow range consists of 20 pumps with connections from 32 to 150mm, providing capacities up to 350m3/hr at heads up to 80m. Their self-priming ability isup to 7m and they handle liquids with a viscosities up to 150 mPa.s.Pumps are available in cast iron or bronze and in a stainless steel version for handling aggressive, corrosive and environmentally harmful liquids.
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