Centrifugal pumps designed for corrosive fluids, suitable for crystallizing liquids or those with suspended solids Constructed with an external casing in cast iron, with internal volute and impeller made of PVDF, polypropylene, Teflon-PFA or TeflonFEP. Some small models feature integral non-metallic casing. Shaft sealing with single or double mechanical seal options with a dry spring and connections for steam quench or external flushing. Equipped with a thermo-siphon system for double seal versions. Semi-open impeller and stainless steel shaft with a nonmetallic sleeve