The topics of environmental protection and slowing global warming are becoming increasingly important in the market for valves. This is why there are new, stricter standards worldwide, such as TA Luft Rev 2021, ISO 15848 or API 641. Our special valves with FSN-EF sealing in sizes DN15 to DN400 (½‘’ to 16‘’) are now certified according to ISO 15848-1 from -29°C to +230°C in accordance with the highest tightness class A. The special valves remain tight to the atmosphere under high mechanical loads and temperature changes, even without readjusting the stem seal. We are also working on certification down to -45°C, for which test series are currently being carried out.