BS EN 558:2017 pdf free download.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 specifies the “face—to-face (FTF) and centre-to-Iace” (CTF) dimensions for PN and Class designated metal valves used In flanged pipe systems.
BS EN 558 covers valves with the following PN, Class and DN values:
— PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40; PN 63; PN 100; PN 160; PN 250; PN 320; PN 400;
— Class 125; Class 150; Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
— ON 10; DN 15; DN 20; ON 25; ON 32; ON 40; DN 50; DN 65; DN 80; DN 100; DN 125; DN 150; ON 200; DN 250; DN 300; ON 350; ON 400; DN 450; DN 500; ON 600; DN 700; ON 750; DN 800; DN 900. ON 1 000; DN 1050; ON 1 200; DN 1 400; ON 1 600; ON 1 800; DN 2 000.
For valves in other shell materials than metal the same FTF and CTF dimensions may be used. For relationship between ON and NPS see Annex 8.
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 BS EN 558, the terms and defInitions given in EN 736-1 and the following apply.
3.1
face-to-face dimensions
(FTF)
Istraight pattern valvesj
distance between the two planes perpendicular to the valve axis located at the extremities ol the body end ports or as specified in the relevant valve product standard
Note 1 to entry: See Figures ito 4.
4 Dimensions and tolerances
4.1 Basic series
The basic series of FTF and Cl,f dimensions shall be as given in [able 2.
4.2 Face-to-face and centre-to-face dimensions
4.2.1 General
The FTF and CTF dimensions shall be in accordance with Figures 1 to 4 and Table Z.
For each type of valve, the basic series to be taken into consideration are given in Table 5 to Table 16.
NOTE 1 Table 2 gives complete series. In TableS to Table 16, the columns of series may be incomplete.
NOTE 2 For certain sizes/types of valves, alternative dimensions are permitted and these are specifIed in Table S to Table 16 as appropriate.
NOTE 3 The origin of the basic series is shown in Annex A (informative).
4.2.2 Class designated valves with ring joint flanges
For Class designated valves with ring joint flanges, the FTF or CTF dimensions given in Table 2 shall be increased by x as defined in Table 1 and Figure 5.
If this is the case, the manufacturer shall indicate the deviation from the standardized FTF or CTF dimensions in his documentation.
4.2.4 Raised face flanges
The raised face dimensions shall be in accordance with the applicable flange standard.
4.3 Tolerances
Tolerances on FTF and CTF dimensions are given in Table 3. Both tolerances shall be fulfilled.
End flange seating surfaces shall be parallel or perpendicular. Tolerances “c” on the parallelism or perpendicularity as shown in Figure 6 are given in Table 4.