The chemically-resistant butterfly valves are available in large diameter sizes up to eight or 12 inches, depending on model. The valves feature a disc and liner made of PVDF and PTFE seals to provide superior 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 valves provide exceptional reliability, 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. Further reliability is provided with the disc’s PTFE outer shell and FPM inner core. The new valves were designed to provide a solution for plastic piping systems that handle extremely aggressive chemicals. Available in two styles, the wafer style is available in sizes 2-12” and is manufactured with glass filled polypropylene compatible with ANSI and DIN flanges. The lug style valve is available in sizes 2-8” and is constructed of epoxy powder coated ductile iron with ANSI 150 bolt pattern. Both valves provide an operating temperature range of -20º to 120 ºC and can be electrically or pneumatically actuated. Other outstanding characteristics include bi-directional capability and a high psi rating of 150. The valves meet international standards of DIN EN ISO 16136, ISO 9393, and EN 558. Approvals include DIBt, ACS, TA Luft, KTW approval for drinking water. NSF61 approval is pending.