Two new butterfly valves have been introduced for highly corrosive environments. The FK Polypropylene Butterfly Valve offers chemical resistance in highly corrosive environments. The special trapezoid shape of the line and a serrated body cavity guarantee a bubble-tight seal while keeping break-away torque at a minimum. The FE PVC Butterfly Valve Series incorporates many of the features of the FK Series. The FE Series offers all PVC construction with EPDM seat, which makes the valve ideal for water and light industrial applications.