SIST EN 558:2017

SLOVENSKI STANDARD
01-maj-2017
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SIST EN 26554:2000
SIST EN 558:2008+A1:2012
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Industrial valves - Face-to-face and centre-to-face dimensions of metal valves for use in
flanged pipe systems - PN and Class designated valves
Industriearmaturen - Baulängen von Armaturen aus Metall zum Einbau in Rohrleitungen
mit Flanschen - Nach PN und Class bezeichnete Armaturen
Robinetterie industrielle - Dimensions face-à-face et face-à-axe de la robinetterie
métallique utilisée dans les systèmes de canalisations à brides - Appareils de
robinetterie désignés PN et Class
Ta slovenski standard je istoveten z: EN 558:2017
ICS:
23.060.01 Ventili na splošno Valves in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 558
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2017
EUROPÄISCHE NORM
ICS 23.040.99; 23.060.10 Supersedes EN 26554:1991, EN 558:2008+A1:2011
English Version
Industrial valves - Face-to-face and centre-to-face
dimensions of metal valves for use in flanged pipe systems
- PN and Class designated valves
Robinetterie industrielle - Dimensions face-à-face et Industriearmaturen - Baulängen von Armaturen aus
face-à-axe de la robinetterie métallique utilisée dans Metall zum Einbau in Rohrleitungen mit Flanschen -
les systèmes de canalisations à brides - Appareils de Nach PN und Class bezeichnete Armaturen
robinetterie désignés PN et Class
This European Standard was approved by CEN on 25 December 2016.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2017 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 558:2017 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Dimensions and tolerances . 8
4.1 Basic series . 8
4.2 Face-to-face and centre-to-face dimensions. 8
4.2.1 General . 8
4.2.2 Class designated valves with ring joint flanges . 8
4.2.3 Valves with lining . 9
4.2.4 Raised face flanges . 10
4.3 Tolerances . 10
Annex A (informative) Origin of basic series . 29
Annex B (informative) Relationship between DN and NPS . 32
Bibliography . 33

European foreword
This document (EN 558:2017) has been prepared by Technical Committee CEN/TC 69 “Industrial
valves”, the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2017, and conflicting national standards shall
be withdrawn at the latest by August 2017.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 558:2008+A1:2011 and EN 26554:1991.
The main changes to the previous edition are the following:
— PN 500 has been deleted from the scope;
— Figure 4 has been updated;
— 4.2.4 for raised face flanges has been simplified and Figure 6 has been deleted;
— DN 1050 has been added in the scope, Table 2 and Table B.1;
— Basic series 111 to 124 have been added in Table 2 and in Table A.1;
— FTF series 117 to 121, Class 250 and Class 600 have been added in Table 12;
— FTF series 111 and 112 have been added in Table 13;
— A new Table 16 was added for steam traps.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and the United Kingdom.
Introduction
The basic series given in this document are taken from the original series shown in Annex A. Changes
made to the original series will not be automatically incorporated into this document.
The numbers of the existing ISO basic series are maintained as in ISO 5752:1982.
1 Scope
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:
— 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;
— DN 10; DN 15; DN 20; DN 25; DN 32; DN 40; DN 50; 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;
DN 900; DN 1 000; DN 1050; DN 1 200; DN 1 400; DN 1 600; DN 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 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.
Key
a face-to-face (FTF)
b centre-to-face (CTF)
Figure 1 — Face to face and centre to face dimensions

Type A Type B
Key
a face-to-face (FTF)
Figure 2 — Flanged valves PN and Class designated (flat and raised faces)

Type C Type D Type E Type F Type G Type H
Key
a face-to-face (FTF)
Figure 3 — Flanged valves PN designated (spigot and recess)
Class 150 and Class 300 Class 600 and above
Large or small male face
Large or small female face
Large or small tongue
Large or small groove
NOTE For elevation e, see appropriate flange standard.
Key
a for dimensions see Table 2
b face-to-face (FTF)
c centre-to-face (CTF)
e elevation
Figure 4 — Flanged valves Class designated
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 and Table 2.
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 Table 5 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 5 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.

a)
b)
Key
a FTF = Dimension of Table 2 + x
b CTF = Dimension of Table 2 + 0,5 x
Figure 5 — FTF and CTF dimensions for Class designated valves with ring joint flanges
Table 1 — Additional length x for ring joint flanges
Dimensions in millimetres
Nominal
Additional length x for ring joint flanges
size
DN Class 150 Class 300 Class 600 Class 900 Class 1 500 Class 2 500
15 11,1 11,1 - 1,6
20 0
25 0 0
12,7 0
40 3,2
6,4
80 3,2
100 9,5
125 3,2
12,7 12,7
150 6,4
15,9 3,2
200 15,9
9,5
22,2
300 15,9
350 19,1
9,5
450 22,2
12,7
500 19,1 6,4
600 22,2 9,5 19,1 28,6
–
25,4 12,7
800 – – –
900 28,6 15,9
1 000
4.2.3 Valves with lining
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.
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.

Figure 6 — Tolerances on parallelism and perpendicularity

Table 2 — Dimensions of basic series
Dimensions in millimetres
Basic series
DN DN
a a a a a a
1 2 3 4 5 7 10 12 13 14 15 16 18 19 20 21 25
8 9 11 22 23 24
10 130 210 102 – – 108 90 105 – – 130 – 115 – – 80 — – – 65 70 – – 10
15 130 210 108 140 165 108 90 105 108 57 130 – 115 – – 80 140 – 152 65 70 83 – 15
20 150 230 117 152 190 117 95 115 117 64 130 – 120 – – 90 152 – 178 70 75 95 – 20
25 160 230 127 165 216 127 100 115 127 70 140 – 125 120 – 100 165 – 216 80 85 108 – 25
32 180 260 140 178 229 146 105 130 140 76 165 – 130 140 – 110 178 – 229 90 95 114 – 32
40 200 260 165 190 241 159 115 130 165 83 165 106 140 240 33 120 190 33 241 95 100 151 – 40
50 230 300 178 216 292 190 125 150 203 102 203 108 150 250 43 1
...