NBN EN 19:2002

This Standard specifies the requirements for marking of industrial metallic valves. It defines the method of applying the markings, on the body, on a flange, on an identification plate or any other location.
When specified as a normative reference in a valve product or performance standard, this Standard has to be considered in conjunction with the specified requirements of that valve product or performance standard.
The marking requirements for plastic valves are not within the scope of this Standard.