EN-558-1 : Industrial valves, Face-to-face and centre-to-face Dimensions of metal valves for use in flanged pipe systems - PN and Class designated valves
The EN 558 norm compiles several intenational standards for face-face distances on valves. The numbers of the existing ISO basic series are maintained as in ISO 5752:1982.
(Note: Valve manufacturers catalogues are the source of the following information. Valvias is not responsable of any due to wrong information. Use the original standards for more feseable data.)