The ball valves by Hartmann are gas-tight and have a metallic sealing between ball and seal ring. Thus they withstand aggressive media, high pressures and high temperatures. Examples for applica-tions under extreme conditions are given by valves (DN 125 PN160) for oxygen at 350 °C and water vapour at 450 °C and by valves of type 12”PN50, which absolved about 400,000 cycles in de-grassed media at 200 °C. Furthermore, valves for hydrogen applications and 20” valves for operation in carbon pressure facilities at 400 °C are produced. The valve tightness has been verified by an abrasion test at 425 °C and helium as test gas. For abrasive media such as TiO2 an 8” valve for portioning was developed, with which revision intervals of few weeks could be lengthened up to 15 months. During this time the valves absolved about 1 million cycles.
Hall 8.0, Booth B36
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