GF Piping Systems has introduced its new chemically resistant Type 567 and 568 butterfly valves in large diameter sizes up to 8 or 12in, depending on model. The new valves feature a disc and liner made of PVDF (polyvinylidene fluoride) and PTFE (polytetrafluorethylene) seals to provide chemical resistance and performance capabilities across a wide temperature range. Suitable applications include chemical processing, chlorine electrolysis, chemical production, and sanitization in markets such as food and beverage, pulp and paper, and steel production. By combing the two high-performance plastics of PVDF and PTFE, the new valves provide low permeability and high chemical resistance for conveying extremely aggressive media. Specifically, three separate sealing elements are used: a PTFE profile seal in the seal passage, a double internal shaft seal on both sides of the shaft, and a special profile flange seal with broader contact face. Available in two styles, the Type 567 Wafer style is available in sizes 2-12in and is manufactured with glass filled polypropylene compatible with ANSI and DIN flanges. The Type 568 Lug Style Valve is available in sizes 2-8in and is constructed of epoxy powder coated ductile iron with ANSI 150 bolt pattern.
