DN shows the nominal flow diameter. Actual flow diameter complies with full port DIN 3357 part 4.
Stem configuration of valves over 2″ is slightly different. Ball valves are marked CE on handle from 1.1/4″ to 2″,
on body over 2″ as follow :
CE 1115 cat IIIB+D PS: 5 GAS TS1: -20°C TS2: +60°C