This European Standard specifies the marking of general purpose industrial valves. It gives the description of the mandatory markings and of supplementary markings which may be necessary and states the manner of applying the markings, viz. on the body, on a flange, or on an ident-fication plate. Markings on the body may be integral with the body or on a plate, distinct from the identification plate mentioned above and securely fixed to the body.
DS/EN 19:1992 history
2002DS/EN 19:2002 Industrial valves - Marking of metallic valves
1992DS/EN 19:1992 Marking of general purpose industrial valves