DANSK DSF/ISO/FDIS 21159 PDF

This International Standard specifies requirements of design, manufacture, and test methods for cryogenic butterfly valves in order to have excellent quality of leakage stability in a very low temperature service (-196°C~80°C). It covers valves of nominal sizes: DN: 80,100,150,200,250,300,350,400,450,500,600. Corresponding to nominal pipe size (NPS): 3,4,6,8,10,12,14,16,18,20,24.