BS EN 558:2017 pdf free.Industrial valves- Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems- PN and Class designated valves.
BS EN 558 This European Standard specifies the “face-to-face” (FTF) and “centre-to-face” (CTF) dimensions for PN and Class designated metal valves used in flanged pipe systems.This European Standard covers valves with the following PN, Class and DN values:一PN2,5;PN6;PN10;PN16;PN25;PN40;PN63;PN100;PN160;PN250;PN320;PN400;
-Class 125; Class 150; Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
DN 10; DN15; DN20; DN 25; DN32; DN 40; DN50; DN 65; DN 80; DN 100; DN 125; DN 150;
DN 200; DN 250; DN 300; DN 350; DN 400; DN 450; DN 500; DN 600; DN 700; DN 750; DN 800;
DN900;DN1000;DN1050;DN1200;DN1400;DN1600;DN1800;DN2000. For valves in other shell materials than metal the same FTF and CTF dimensions may be used. For relationship between DN and NPS see Annex B. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.EN 736-1, Valves . Terminology- Part 1: Definition of types of valves.3，Terms and definitions For the purposes of this document, the terms and definitions given in EN 736-1 and the following apply. 3.1 face-to-face dimensions (FTF)
[straight pattern valves] distance between the two planes perpendicular to the valve axis located at the extremities of the body end ports or as specified in the relevant valve product standard Note 1 to entry: See Figures 1 to 4. Note 2 to entry: In millimetres. 3.2 centre-to-face dimensions (CTF) [angle pattern valves]
distance, between the plane located at the extremity of either body end port and perpendicular to its axis and the axis of the other body end port Note 1 to entry: See Figures 1 to 4.Note 2 to entry: In millimetres. For valves having a resilient lining which forms the gasket joint with the mating flanges, the FTF and
CTF dimensions shall be the distance between the extremities of the valve in the installed condition. If the dimensions for CTF and FTF differ from the standard dimensions, they shall be given by the manufacturer.For valves having a resilient or hard lining, the thickness of the lining on the mating surface shall be included in the FTF and CTF dimensions given in Table 2, unless the design of the valve precludes such an inclusion.BS EN 558 pdf downlaod.