The size comparison table of Sanitary Ball Valve is as follows:

Inch means: 1/2", 3/4", 1", 1-1/2", 2", etc. These sizes correspond to different pipe diameters.
DN means: DN15-DN150, where DN15 corresponds to 1/2", DN20 corresponds to 3/4", DN25 corresponds to 1", DN40 corresponds to 1-1/2", DN50 corresponds to 2", etc.

Please note that the specific size may vary depending on the manufacturer and product model. When selecting a sanitary ball valve, it is recommended to refer to the technical specification sheet of the specific product or consult the manufacturer for accurate information.