The Type 567/568 butterfly valves (photo) feature a passage seal made of polytetrafluoroethylene (PTFE) in combination with the FPM backing seal and the PVDF media-contacting parts, which guarantee better chemical resistance and expands the application range possibilities. The butterfly valves are suitable for conveying aggressive media and operate over the temperature range from –20 to 120°C. The valves are available with a handle lever for manual operation, with manual gears, as well as with pneumatic or electric actuation from DN 50 to DN 300 for wafers and lug-style installation. With the new PVDF/PTFE butterfly valves, a homogeneous plastic piping system is now available from this firm, with pipes, fittings and butterfly valves. — GF Piping Systems Ltd., Schaffhausen, Switzerland