BS/EN 558-2008 pdf 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.
This BS/EN 558 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 standard 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; PN 500
— Class 125; Class 150: Class 250; Class 300; Class 600; Class 900; Class 1 500; Class 2 500.
— ON 10; ON 15: DN 20: DN 25: DN 32; ON 40; DN 50; DN 65; DN 80; ON 100; DN 125; ON 150; ON 200; ON 250; ON 300: DN 350; ON 400; ON 450: DN 500; DN 600; DN 700: ON 750; DN 800; ON 900; ON 1 000; ON 1 200: DN 1 400: ON 1 600; DN 1 800; ON 2000.
The face-to-face dimensions of flanged automatic steam traps are specified in EN 26554.
For valves in other shell materials than metal the same FTF and CTF dimensions may be used.
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app(ies,
EN 736-1 :1995, Valves – Terminology – Part 1: Definition of types of valves
ISO 5752:1982. Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions of EN 736-1:1995, and the following apply.
face-to-face dimensions (FTF)
(straight pattern valves)
distance, in millimetres, 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 (see Figures 1 to 3)
3.2
centre-to-face dimensions (CTF)
(angle pattern valves)
distance, in millimetres, between the plane located at the extremity of either body end port and perpendicular.
4 Dimensions and tolerances
4.1 Basic series
The basic series of FTF and CTF dimensions shall be as given in Table 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.
For each type of valve, the basic series to be taken into consideration are given in Table 4 to Table 14.
NOTE 1 Table 2 gives complete series. In Table 4 to Table 14 the columns of senes may be incomplete,
NOTE 2 For certain sizesftypes of valves, alternative dimensions are permitted and these are specified in Table 4 to
Table 14 as appropriate.
NOTE 3 The origin of the basic series is shown In Annex A (Informative).
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 the Table 1.
4.2.2 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.
4.2.3 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.
If this is the case, the manufacturer shall indicate the deviation from the standardised FTF or CTF dimensions in his documentation.
4.2.4 Raised face flanges
For valves:
— having flanges with 1.6 mm raised flange:
— in grey cast iron, Class 250:
ductile cast iron, Class 150 and 300;BS/EN 558-2008 pdf download.
BS/EN 558-2008 pdf download
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