ISO 5752:2021

Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions

This document specifies the basic series of face-to-face (FTF) and centre-to-face (CTF) dimensions for two-way metal valves of the gate, globe, diaphragm, ball, plug, butterfly design types used as isolating and check valves in flanged pipe systems. Each basic series of face-to-face and centre-to-face dimensions can be used as required with flanges of mating dimensions conforming to the equivalent EN or ASME flange series. This document covers valves with the following PN, Class, DN and NPS 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 650; DN 700; DN 750; DN 800; DN 900; DN 1 000; DN 1 050; DN 1 200; DN 1 400; DN 1 600; DN 1 800; DN 2 000; — corresponding to nominal sizes NPS: ⅜; ½; ¾; 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20; 24; 26; 28; 30; 32; 36; 40; 42; 48; 56; 64; 72; 80. NOTE See Annex B for the relationship between DN and NPS.

Appareils de robinetterie métalliques utilisés dans les tuyauteries à brides — Dimensions face-à-face et face-à-axe

General Information

• Status: Published
• Publication Date: 21-Jun-2021
• ICS: 23.060.01 - Valves in general
• Technical Committee: ISO/TC 153 - Valves
• Drafting Committee: ISO/TC 153 - Valves
• Current Stage: 6060 - International Standard published
• Start Date: 22-Jun-2021
• Due Date: 26-Feb-2022
• Completion Date: 22-Jun-2021

Relations

• Revises: ISO 5752:1982 - Metal valves for use in flanged pipe systems — Face-to-face and centre-to-face dimensions
• Effective Date: 23-Apr-2020

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 5752
Third edition
2021-06
Metal valves for use in flanged pipe
systems — Face-to-face and centre-to-
face dimensions
Appareils de robinetterie métalliques utilisés dans les tuyauteries à
brides — Dimensions face-à-face et face-à-axe
Reference number
ISO 5752:2021(E)
©
ISO 2021

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ISO 5752:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
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Phone: [phone]
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Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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ISO 5752:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 2
Annex A (normative) Additional length for valves with ring joint flange .27
Annex B (informative) Relationship between DN and NPS .29
Annex C (informative) Origin of basic series .30
Bibliography .34
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ISO 5752:2021(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 153, Valves.
This third edition cancels and replaces the second edition (ISO 5752:1982), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— extension to PN 63; PN 100; PN 160; PN 250; PN 320; PN 400; deletion of PN 1; PN 1,6; PN 4;
— extension to Class 900; Class 1 500; Class 2 500;
— addition of DN 1 050; deletion of DN 550;
— deletion of Table 1 (Isobaric) and Table 10 (copper alloy);
— update of the basic series in Table 1;
— update of the face-to-face and centre-to-face dimensions in Tables 2 to 19;
— addition of an informative Annex B giving the relationship between DN and NPS;
— addition of an informative Annex C giving the origin of each basic series.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
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ISO 5752:2021(E)

Introduction
The aim of this document is to establish face-to-face and centre-to-face dimensions for metal valves
to permit a degree of dimensional interchangeability. They are intended to be used in valve product
standards.
Although the tables of face-to-face dimensions in this document represent a considerable rationalization
of international practices, it has not been possible to reduce these to a single series of dimensions for
the various types of valves. Alternatives have been included. For convenience these have been called
short, medium and long, but these terms are not used in a descriptive sense.
The pressure/temperature ratings for the different types of valves are those to be specified for the type
of valves and materials used.
The principle of establishing dimensions in this document is that, first, there exists an ISO industrial
valve standard covering that product, in its size and pressure rating, and second, certain valve types
are of significant international demand and their use justifies inclusion in this document.
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INTERNATIONAL STANDARD ISO 5752:2021(E)
Metal valves for use in flanged pipe systems — Face-to-face
and centre-to-face dimensions
1 Scope
This document specifies the basic series of face-to-face (FTF) and centre-to-face (CTF) dimensions for
two-way metal valves of the gate, globe, diaphragm, ball, plug, butterfly design types used as isolating
and check valves in flanged pipe systems. Each basic series of face-to-face and centre-to-face dimensions
can be used as required with flanges of mating dimensions conforming to the equivalent EN or ASME
flange series.
This document covers valves with the following PN, Class, DN and NPS 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 650; DN 700; DN 750; DN 800;
DN 900; DN 1 000; DN 1 050; DN 1 200; DN 1 400; DN 1 600; DN 1 800; DN 2 000;
— corresponding to nominal sizes NPS: ⅜; ½; ¾; 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20;
24; 26; 28; 30; 32; 36; 40; 42; 48; 56; 64; 72; 80.
NOTE See Annex B for the relationship between DN and NPS.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
DN
NPS
nominal size
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes, comprising the letters DN or NPS followed by a dimensionless number which is indirectly
related to the physical size, (in millimetres for DN and in inches for NPS), of the bore or outside diameter
of the end connections
Note 1 to entry: The number following DN or NPS does not represent a measurable value and is not used for
calculation purposes except where specified in a product standard.
[SOURCE: ISO 6708:1995, 2.1, modified — The terms "nominal size" and "NPS" have been added, "NPS"
has been integrated into the definition and the Note 2 to entry has been deleted.]
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ISO 5752:2021(E)

3.2
PN
Class
nominal pressure
numerical designation relating to pressure that is a convenient rounded number for reference purposes,
and which comprises the letters “PN” or “Class” followed by the appropriate reference number
Note 1 to entry: It is intended that all equipment of the same nominal size (DN or NPS) (3.1) designated by the
same PN number or Class number shall have compatible mating dimensions.
Note 2 to entry: The maximum allowable pressure depends on materials, design and working temperature, and is
to be selected from the tables of pressure/temperature ratings given in the appropriate standards.
[SOURCE: ISO 7268:1983, Clause 2, modified — The terms "nominal pressure" and “Class” have been
added, and “Class” has been integrated into the definition.]
3.3
face-to-face dimension
FTF
distance between the two planes perpendicular to the valve axis located at
the extremities of the body end ports
Note 1 to entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Figures 1 to 5 and Figure A.1.
3.4
centre-to-face dimension
CTF
distance, between the plane located at the extremity of either body end port and
perpendicular to its axis and the other body end port axis
Note 1 to entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Figures 1 to 5 and Figure A.1.
4 Dimensions and tolerances
The basic series of FTF and CTF dimensions, expressed in millimetres, shall be as given in Table 1.
Table 1 is a summary of the dimensions in Tables 2 to 19 giving the origin of each series and should be
referred to when considering valve types not covered by this document. Each particular column does
not necessarily include all the values of the relevant basic series. See Annex C for information as to the
origin of each basic series.
Tables 17 and 18 cover butterfly check or wafer check valves which are retained in the piping by bolting
that spans the two adjacent flanges, however these valves may alternately be furnished with full end
flanges. Check valves shown as ‘long pattern’ shall be furnished with full end flanges only.
The face-to-face and centre-to-face dimensions, as appropriate for the types of valves covered by this
document, shall be in accordance with Tables 2 to 19, and the tolerances shall be in accordance with
Tables 20 and 21. Annex A includes additional information on face-to-face and centre-to-face dimensions
where ring joint facing is used and shall be followed.
Tolerances on FTF and CTF dimensions as shown in Figure 1 are given in Table 20. Both tolerances shall
be fulfilled.
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ISO 5752:2021(E)

Key
a face-to-face (FTF)
b centre-to-face (CTF)
Figure 1 — Face to face and centre to face dimensions

a) flat face b) raised face
Key
a face-to-face (FTF)
Figure 2 — Flanged valves PN and Class designated (flat and raised faces)
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ISO 5752:2021(E)

a) b) c) d) e) f)
Key
a face-to-face (FTF)
Figure 3 — Flanged valves PN designated (other types)
Class 150 and Class 300 Class 600 and above
a) Large or small male face
b) Large or small female face
c) Large or small tongue
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ISO 5752:2021(E)

Class 150 and Class 300 Class 600 and above
d) Large or small groove
Key
a for dimensions, see Tables 2 to 19
b face-to-face (FTF)
c centre-to-face (CTF)
e height
NOTE For height e, see appropriate flange standard.
Figure 4 — Flanged valves Class designated (other types)
End flange seating surfaces shall be parallel or perpendicular. Tolerances “c” on parallel or perpendicular
surfaces as shown in Figure 5 are given in Table 21.
Figure 5 — Tolerances on parallelism and perpendicularity
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ISO 5752:2021(E)

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Table 1 — Dimensions of basic series (1-24)
Dimensions in millimetres
Nominal size Basic series DN
a a a a
DN NPS 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24
10 ⅜ 130 210 102 — — 108 90 105 102 51 130 — 115 — — – 80 — — — — 10
b
15 ½ 130 210 108 140 165 108 90 105 108 57 130 — 115 — — 140 80 140 — 108 83 15
b
20 ¾ 150 230 117 152 190 117 95 115 117 64 130 — 120 — — 152 90 152 25 117 95 20
c
25 1 160 230 127 165 216 127 100 115 127 70 140 — 125 120 — 165 100 165 25 216 108 25
d
32 1 ¼ 180 260 140 178 229 146 105 130 140 76 165 — 130 140 — 178 110 178 33 229 114 32
e
40 1 ½ 200 260 165 190 241 159 115 130 165 83 165 106 140 240 33 190 120 190 33 241 121 40
50 2 230 300 178 216 292 190 125 150 203 102 203 108 150 250 43 216 135 216 43 267 146 50
65 2 ½ 290 340 190 241 330 216 145 170 216 108 222 112 170 270 46 241 165 241 46 292 165 65
80 3 310 380 203 283 356 254 155 190 241 121 241 114 180 280 64 283 185 283 46 318 178 80
100 4 350 430 229 305 432 305 175 215 292 146 305 127 190 300 64 305 229 305 52 356 216 100
g
125 5 400 500 254 381 508 356 200 250 330 178 356 140 200 325 70 381 — 381 56 400 254 125
h
150 6 480 550 267 403 559 406 225 275 356 203 394 140 210 350 76 403 — 403 56 444 279 150
f
200 8 600 650 292 419 660 521 275 325 495 248 457 152 230 400 89 502 — 419 60 533 330 200
250 10 730 775 330 457 787 635 325 — 622 311 533 165 250 450 114 568 — 457 68 622 394 250
300 12 850 900 356 502 838 749 375 — 698 349 610 178 270 500 114 648 — 502 78 711 419 300
350 14 980 1 025 381 762 889 — 425 — 787 394 686 190 290 550 127 762 — 572 78 838 — 350
i
400 16 1 100 1 150 406 838 991 — 475 575 864 457 762 216 310 600 140 838 — 610 102 864 — 400
450 18 1 200 1 275 432 914 1 092 — 500 — 978 483 864 222 330 650 152 914 — 660 114 978 — 450
500 20 1 250 1 400 457 991 1 194 — — 700 978 — 914 229 350 700 152 991 — 711 127 1 016 — 500
600 24 1 450 1 650 508 1 143 1 397 — — — 1 295 — 1 067 267 390 800 178 1 143 — 787 154 1 346 — 600
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.
b
For swing check valve only. For globe valve use152 for DN15 and 178 for DN20.
c
For swing check valve only. For globe valve use 203.
d
For swing check valve only. For globe valve use 216.
e
For swing check valve only. For globe valve use 229.
f
For swing check valve only. For globe valve use 559.
g
For swing check valve only. For globe valve use 356.
h
For swing check valve only. For globe valve use 406.
i
For swing check valve only. For globe valve use 914.

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ISO 5752:2021(E)

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Table 1 (continued)
Nominal size Basic series DN
a a a a
DN NPS 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24
650 26 — — 559 1 245 1 448 — — — 1 295 — 1 143 — — — — 1 245 — — — 1 346 — 650
700 28 1 650 — 610 1 346 1 549 — — — 1 448 — — 292 430 900 229 1 346 — — 165 1 499 — 700
750 30 1 750 — 610 1 397 1 651 — — — 1 524 — 1 295 — — 950 230 1 397 — — 190 1 594 — 750
800 32 1 850 — 660 1 524 1 778 — — — 1 676 — — 318 470 1 000 241 1 524 — — 190 1 778 — 800
900 36 2 050 — 711 1 727 2 083 — — — 1 956 — 1 600 330 510 1 100 241 1 727 — — 203 2 083 — 900
1 000 40 2 250 — 813 — — — — — — — — 410 550 1 200 300 — — — 216 — — 1 000
1 050 42 — — — — — — — — — — — — — — — — — — — — — 1 050
1 200 48 — — — — — — — — — — — 470 630 — 350 — — — 254 — — 1 200
1 400 56 — — — — — — — — — — — 530 710 — 390 — — — — — — 1 400
1 600 64 — — — — — — — — — — — 600 790 — 440 — — — — — — 1 600
1 800 72 — — — — — — — — — — — 670 870 — 490 — — — — — — 1 800
2 000 80 — — — — — — — — — — — 760 950 — 540 — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.
b
For swing check valve only. For globe valve use152 for DN15 and 178 for DN20.
c
For swing check valve only. For globe valve use 203.
d
For swing check valve only. For globe valve use 216.
e
For swing check valve only. For globe valve use 229.
f
For swing check valve only. For globe valve use 559.
g
For swing check valve only. For globe valve use 356.
h
For swing check valve only. For globe valve use 406.
i
For swing check valve only. For globe valve use 914.

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ISO 5752:2021(E)

8 © ISO 2021 – All rights reserved
Table 1 — (25-71) (continued)
Nominal size Basic series DN
a a a a
DN NPS 25 26 27 28 32 48 54 55 56 57 58 59 69 70 71
10 ⅜ — — 115 130 — — — — — — — — — — — 10
15 ½ — — 115 130 76 — — 216 264 — 108 132 — — — 15
20 ¾ — — 120 150 89 — 229 229 273 114 114 137 — — — 20
25 1 — — 125 160 102 — 254 254 308 127 127 154 140 140 186 25
32 1 ¼ — — 130 180 108 — 279 279 349 140 140 175 165 165 232 32
40 1 ½ 37 240 140 200 114 180 305 305 384 152 152 192 178 178 232 40
50 2 44 250 150 230 133 200 368 368 451 184 184 226 216 216 279 50
65 2 ½ 49 290 170 290 146 240 419 419 508 210 210 254 254 254 330 65
80 3 49 310 180 310 159 260 381 470 578 190 235 289 305 305 368 80
100 4 56 350 190 350 178 300 457 546 673 229 273 337 356 406 457 100
125 5 64 400 325 400 200 350 559 673 794 279 337 397 432 483 533 125
150 6 70 450 350 450 222 400 610 705 914 305 353 457 508 559 610 150
200 8 71 550 400 550 279 500 737 832 1 022 368 416 511 660 711 762 200
250 10 76 650 450 650 311 600 838 991 1 270 419 495 635 787 864 914 250
300 12 83 750 500 750 356 700 965 1 130 1 422 483 565 711 914 991 1 041 300
350 14 92 850 550 850 — 800 1 029 1 257 — 514 629 — 991 1 067 1 118 350
400 16 102 950 762 950 — 900 1 130 1 384 — 660 — — 1 092 1 194 1 245 400
450 18 114 1 050 — — — 1 000 1 219 1 537 — 737 — — — 1 346 1 397 450
500 20 127 1 150 914 1 150 — 1 100 1 321 1 664 — 826 — 1 650 — 1 473 — 500
600 24 154 1 350 — — — 1 300 1 549 1 943 — 991 — — — — — 600
650 26 — — — — — — — — — — — — — — — 650
700 28 — 1 550 — — — 1 500 — — — — — — — — — 700
750 30 — — — — — — — — — — — — — — — 750
800 32 — 1 750 — — — 1 700 — — — — — — — — — 800
900 36 — 1 950 — — — 1 900 — — — — — — — — — 900
1 000 40 — 2 150 — — — 2 100 — — — — — — — — — 1 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO 5752:2021(E)

© ISO 2021 – All rights reserved 9
Table 1 (continued)
Nominal size Basic series DN
a a a a
DN NPS 25 26 27 28 32 48 54 55 56 57 58 59 69 70 71
1 050 42 — — — — — — — — — — — — — — — 1 050
1 200 48 — — — — — — — — — — — — — — — 1 200
1 400 56 — — — — — — — — — — — — — — — 1 400
1 600 64 — — — — — — — — — — — — — — — 1 600
1 800 72 — — — — — — — — — — — — — — — 1 800
2 000 80 — — — — — — — — — — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO 5752:2021(E)

10 © ISO 2021 – All rights reserved
Table 1 — (91-132) (continued)
Nominal size Basic series DN
a
DN NPS 91 92 93 98 99 109 110 119 120 121 126 127 128 130 131 132
10 ⅜ — 230 115 65 — — — — — — — — — — — — 10
15 ½ — 230 115 65 — — — — — — — — — — — — 15
20 ¾ — 260 130 65 — — — — — — — — — — — — 20
25 1 — 260 130 65 — — — — — — — — — — — — 25
32 1 ¼ — 300 150 80 — — — — — — — — — — — — 32
40 1 ½ 310 300 150 85 270 — — — — — — — — — — — 40
50 2 350 350 175 100 300 — — 60 60 60 70 70 70 114 121 165 50
65 2 ½ 425 400 200 130 360 — — 67 67 67 83 83 83 — — — 65
80 3 470 450 225 160 390 48 54 73 73 73 83 83 86 121 143 165 80
100 4 550 520 260 190 450 54 64 73 73 79 102 102 105 121 165 197 100
125 5 650 600 300 240 525 — — — — — — — — — — — 125
150 6 750 700 350 250 600 59 78 98 98 136 159 159 159 130 194 219 150
200 8 950 800 400 320 750 73 102 127 127 165 206 206 206 152 219 254 200
250 10 1 150 900 — — 900 83 117 146 146 213 241 248 254 178 244 267 250
300 12 1 350 1 050 — — 1 050 92 140 181 181 229 292 305 305 — — — 300
350 14 1 550 — — — 1 200 117 155 184 222 273 356 356 — — — — 350
400 16 1 750 — — — 1 350 133 178 191 232 305 384 384 — — — — 400
450 18 1 950 — — — 1 500 149 200 203 264 362 451 468 — — — — 450
500 20 2 150 — — — 1 650 159 216 219 292 368 451 533 — — — — 500
600 24 — — — — — 181 232 222 318 438 495 559 — — — — 600
650 26 — — — — — — — 222 318 457 533 — — — — — 650
700 28 — — — — — — — 305 368 483 572 — — — — — 700
750 30 — — — — — — — 305 368 505 635 — — — — — 750
800 32 — — — — — — — 356 368 533 660 — — — — — 800
900 36 — — — — — — — 368 483 635 718 — — — — — 900
1 000 40 — — — — — — — 432 546 660 762 — — — — — 1 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO 5752:2021(E)

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Table 1 (continued)
Nominal size Basic series DN
a
DN NPS 91 92 93 98 99 109 110 119 120 121 126 127 128 130 131 132
1 050 42 — — — — — — — 432 568 701 787 — — — — — 1 050
1 200 48 — — — — — — — 524 629 787 — — — — — — 1 200
1 400 56 — — — — — — — — — — — — — — — — 1 400
1 600 64 — — — — — — — — — — — — — — — — 1 600
1 800 72 — — — — — — — — — — — — — — — — 1 800
2 000 80 — — — — — — — — — — — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO 5752:2021(E)

Table 2 — Gate valves — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 250
DN NPS PN 6 – 10 – 16 PN 25 – 40 PN 63 – 100 PN 160 – 250
– 320 – 400
Basic series 3 14 15 15 26 26 99 91
10 ⅜ 102 115 — — — — — —
15 ½ 108 115 — — — — — —
20 ¾ 117 120 — — — — — —
25 1 127 125 120 — — — — —
32 1 ¼ 140 130 140 — — — — —
40 1 ½ 165 140 240 240 240 240 270 310
50 2 178 150 250 250 250 250 300 350
65 2 ½ 190 170 270 290 290 290 360 425
80 3 203 180 280 310 310 310 390 470
100 4 229 190 300 350 350 350 450 550
125 5 254 200 325 400 400 400 525 650
150 6 267 210 350 450 450 450 600 750
200 8 292 230 400 550 550 550 750 950
250 10 330 250 450 650 650 650 900 1 150
300 12 356 270 500 750 750 750 1 050 1 350
350 14 381 290 550 850 850 850 1 200 1 550
400 16 406 310 600 950 950 950 1 350 1 750
450 18 432 330 650 1 050 1 050 1 050 1 500 1 950
500 20 457 350 700 1 150 1 150 1 150 1 650 2 150
600 24 508 — 800 1 350 1 350 1 350 — —
650 26 559 — — — — — — —
700 28 610 — 900 1 550 1 550 1 550 — —
750 30 610 — 950 — — — — —
800 32 660 — 1 000 1 750 1 750 1 750 — —
900 36 711 — 1 100 1 950 1 950 1 950 — —
1 000 40 813 — 1 200 2 150 2 150 2 150 — —
1 050 42 — — — — — — — —
1 200 48 — — — — — — — —
Table 3 — Gate valves — Class rating
Nominal size Face-to-face dimensions
Class Class 900 Class 1500 Class 2500
Class Class Class
DN NPS 125-
250 300 600
Short Long Short Long Short Long
150
Basic series 3 19 4 5 69 54 70 55 71 56
10 ⅜ 102 — — — — — — — — —
15 ½ 108 — 140 165 — — — 216 — 264
20 ¾ 117 — 152 190 — 229 — 229 — 273
25 1 127 — 165 216 140 254 140 254 186 308
32 1 ¼ 140 — 178 229 165 279 165 279 232 349
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ISO 5752:2021(E)

Table 3 (continued)
Nominal size Face-to-face dimensions
Class Class 900 Class 1500 Class 2500
Class Class Class
DN NPS 125-
250 300 600
Short Long Short Long Short Long
150
Basic series 3 19 4 5 69 54 70 55 71 56
40 1 ½ 165 — 190 241 178 305 178 305 232 384
50 2 178 216 216 292 216 368 216 368 279 451
65 2 ½ 190 241 241 330 254 419 254 419 330 508
80 3 203 283 283 356 305 381 305 470 368 578
100 4 229 305 305 432 356 457 406 546 457 673
125 5 254 381 381 508 432 551 483 673 533 794
150 6 267 403 403 559 508 610 559 705 610 914
200 8 292 419 419 660 660 737 711 832 762 1 022
250 10 330 457 457 787 787 838 864 991 914 1 270
300 12 356 502 502 838 914 965 991 1 130 1 061 1 422
350 14 381 572 762 889 991 1 029 1 067 1 257 1 118 —
400 16 406 610 838 991 1 092 1 130 1 194 1 384 1 245 —
450 18 432 660 914 1 092 — 1 219 1 346 1 537 1 397 —
500 20 457 711 991 1 194 — 1 321 1 473 1 664 — —
600 24 508 787 1 143 1 397 — 1 549 — 1 943 — —
650 26 559 — 1 245 1 448 — — — — — —
700 28 610 — 1 346 1 549 — — — — — —
750 30 610 — 1 397 1 651 — — — — — —
800 32 660 — 1 524 1 778 — — — — — —
900 36 711 — 1 727 2 083 — — — — — —
1 000 40 813 — — — — — — — — —
1 050 42 — — — — — — — — — —
1 200 48 — — — — — — — — — —
Table 4 — Butterfly valves — Flange type — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10 –16 - 25 - 40
DN NPS PN 63 – 100
Short series Long series
Basic series 13 14 14
25 1 — — 125
32 1 ¼ — — 130
40 1 ½ 106 140 140
50 2 108 150 150
65 2 ½ 112 170 170
80 3 114 180 180
100 4 127 190 190
125 5 140 200 —
150 6 140 210 210
200 8 152 230 230
© ISO 2021 – All rights reserved 13

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ISO 5752:2021(E)

Table 4 (continued)
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10 –16 - 25 - 40
DN NPS PN 63 – 100
Short series Long series
Basic series 13 14 14
250 10 165 250 250
300 12 178 270 270
350 14 190 290 290
400 16 216 310 310
450 18 222 330 330
500 20 229 350 350
600 24 267 390 390
650 26 292 410 —
700 28 292 430 —
750 30 318 450 —
800 32 318 470 —
900 36 330 510 —
1 000 40 410 550 —
1 050 42 410 570 —
1 200 48 470 630 —
1 400 56 530 710 —
1 600 64 600 790 —
1 800 72 670 870 —
2 000 80 760 950 —
Table 5 — Butterfly valves — Flange type — Class rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
Class 125 – 150
DN NPS Class 250 – 300 Class 600
Short Long
Basic series 13 14 14 14
40 1 ½ 106 140 140 140
50 2 108 150 150 150
65 2 ½ 112 170 170 170
80 3 114 180 180 180
100 4 127 190 190 190
125 5 140 200 200 200
150 6 140 210 210 210
200 8 152 230 230 230
250 10 165 250 250 250
300 12 178 270 270 270
350 14 190 290 290 290
400 16 216 310 310 310
450 18 222 330 330 330
500 20 229 350 350 350
600 24 267 390 390 390
14 © ISO 2021 – All rights reserved

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ISO 5752:2021(E)

Table 5 (continued)
Nominal size Face-to-face dimensions
Class 125 – 150
DN NPS Class 250 – 300 Class 600
Short Long
Basic series 13 14 14 14
650 26 292 410 410 —
700 28 292 430 430 —
750 30 318 450 450 —
800 32 318 470 470 —
900 36 330 510 510 —
1 000 40 410 550 550 —
1 050 42 410 570 570 —
1 200 48 470 630 630 —
1 400 56 530 710 710 —
1 600 64 600 790 790 —
1 800 72 670 870 870 —
2 000 80 760 950 950 —
Table 6 — Butterfly valves — Wafer type — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10
PN 10 –16- 25 - 40 PN 63 – 100
–16 – 25 – 40
DN NPS
Short Medium Long
Basic series 20 25 16 110
25 1 33 — 33 —
32 1 ¼ 33 — 33 —
40 1 ½ 33 37 33 —
50 2 43 44 43 —
65 2 ½ 46 49 46 —
80 3 46 49 64 54
100 4 52 56 64 64
125 5 56 64 70 —
150 6 56 70 76 78
200 8 60 71 89 102
250 10 68 76 114 117
300 12 78 83 114 140
350 14 78 92 127 155
400 16 102 102 140 178
450 18 114 114 152 200
500 20 127 127 152 216
600 24 154 154 178 232
650 26 — — — —
700 28 165 — 229 —
750 30 190 165 230 —
800 32 190 — 241 —
© ISO 2021 – All rights reserved 15

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ISO 5752:2021(E)

Table 6 (continued)
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10
PN 10 –16- 25 - 40 PN 63 – 100
–16 – 25 – 40
DN NPS
Short Medium Long
Basic series 20 25 16 110
900 36 203 200 241 —
1 000 40 216 — 300 —
1 050 42 — 251 — —
1 200 48 254 276 350 —
1 400 56 — — 390 —
1 600 64 — — 440 —
1 800 72 — — 490 —
2 000 80 — — 540 —
Table 7 — Butterfly valves — Wafer type — Class rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
Class 125 – 150 Class 250 – 300 Class 600
DN NPS
Short Medium Long Short Medium Long
Basic series 20 25 16 25 109 16 110
40 1 ½ 33 37 33 37 — 33 —
50 2 43 44 43 44 — 43 —
65 2 ½ 46 49 46 49 — 46 —
80 3 46 49 64 49 48 64 54
100 4 52 56 64 56 54 64 64
125 5 56 64 70 64 — 70 —
150 6
...

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 5752
ISO/TC 153
Metal valves for use in flanged pipe
Secretariat: AFNOR
systems — Face-to-face and centre-to-
Voting begins on:
2021­03­16 face dimensions
Voting terminates on:
Appareils de robinetterie métalliques utilisés dans les tuyauteries à
2021­05­11
brides — Dimensions face-à-face et face-à-axe
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO­
ISO/FDIS 5752:2021(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN­
DARDS TO WHICH REFERENCE MAY BE MADE IN
©
NATIONAL REGULATIONS. ISO 2021

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ISO/FDIS 5752:2021(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2021
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH­1214 Vernier, Geneva
Phone: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Dimensions and tolerances . 2
Annex A (normative) Additional length for valves with ring joint flange .27
Annex B (informative) Relationship between DN and NPS .29
Annex C (informative) Origin of basic series .30
Bibliography .34
© ISO 2021 – All rights reserved iii

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ISO/FDIS 5752:2021(E)

Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non­governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/ directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/ patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see www .iso .org/
iso/ foreword .html.
This document was prepared by Technical Committee ISO/TC 153, Valves.
This third edition cancels and replaces the second edition (ISO 5752:1982), which has been technically
revised.
The main changes compared to the previous edition are as follows:
— extension to PN 63; PN 100; PN 160; PN 250; PN 320; PN 400; deletion of PN 1; PN 1,6; PN 4;
— extension to Class 900; Class 1 500; Class 2 500;
— addition of DN 1 050; deletion of DN 550;
— deletion of Table 1 (Isobaric) and Table 10 (copper alloy);
— update of the basic series in Table 1;
— update of the face­to­face and centre­to­face dimensions in Tables 2 to 10;
— addition of an informative Annex B giving the relationship between DN and NPS.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/ members .html.
iv © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Introduction
The aim of this document is to establish face­to­face and centre­to­face dimensions for metal valves
to permit a degree of dimensional interchangeability. They are intended to be used in valve product
standards.
Although the tables of face­to­face dimensions in this document represent a considerable rationalization
of international practices, it has not been possible to reduce these to a single series of dimensions for
the various types of valves. Alternatives have been included. For convenience these have been called
short, medium and long, but these terms are not used in a descriptive sense.
The pressure/temperature ratings for the different types of valves are those to be specified for the type
of valves and materials used.
The principle of establishing dimensions in this document is that, first, there exists an ISO industrial
valve standard covering that product, in its size and pressure rating, and second, certain valve types
are of significant international demand and their use justifies inclusion in this document.
© ISO 2021 – All rights reserved v

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FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 5752:2021(E)
Metal valves for use in flanged pipe systems — Face-to-face
and centre-to-face dimensions
1 Scope
This document specifies the basic series of face-to-face (FTF) and centre-to-face (CTF) dimensions for
two-way metal valves of the gate, globe, diaphragm, ball, plug, butterfly design types used as isolating
and check valves in flanged pipe systems. Each basic series of face-to-face and centre-to-face dimensions
can be used as required with flanges of mating dimensions conforming to the equivalent EN or ASME
flange series.
This document covers valves with the following PN, Class, DN and NPS 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 650; DN 700; DN 750; DN 800;
DN 900; DN 1 000; DN 1 050; DN 1 200; DN 1 400; DN 1 600; DN 1 800; DN 2 000;
— corresponding to nominal sizes NPS: ⅜; ½; ¾; 1; 1 ¼; 1 ½; 2; 2 ½; 3; 4; 5; 6; 8; 10; 12; 14; 16; 18; 20;
24; 26; 28; 30; 32; 36; 40; 42; 48; 56; 64; 72; 80.
NOTE See Annex B for the relationship between DN and NPS.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1
DN
NPS
nominal size
alphanumeric designation of size for components of a pipework system, which is used for reference
purposes, comprising the letters DN or NPS followed by a dimensionless number which is indirectly
related to the physical size, (in millimetres for DN and in inches for NPS), of the bore or outside diameter
of the end connections
Note 1 to entry: The number following DN or NPS does not represent a measurable value and is not used for
calculation purposes except where specified in a product standard.
[SOURCE: ISO 6708:1995, 2.1, modified — The terms "nominal size" and "NPS" have been added, "NPS"
has been integrated into the definition and the Note 2 to entry has been deleted.]
© ISO 2021 – All rights reserved 1

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ISO/FDIS 5752:2021(E)

3.2
PN
Class
nominal pressure
numerical designation relating to pressure that is a convenient rounded number for reference purposes,
and which comprises the letters “PN” or “Class” followed by the appropriate reference number
Note 1 to entry: It is intended that all equipment of the same nominal size (DN or NPS) (3.1) designated by the
same PN number or Class number shall have compatible mating dimensions.
Note 2 to entry: The maximum allowable pressure depends on materials, design and working temperature, and is
to be selected from the tables of pressure/temperature ratings given in the appropriate standards.
[SOURCE: ISO 7268:1983, Clause 2, modified — The terms "nominal pressure" and “Class” have been
added, and “Class” has been integrated into the definition.]
3.3
face-to-face dimension
FTF
distance between the two planes perpendicular to the valve axis located at
the extremities of the body end ports
Note 1 to entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Figures 1 to 5 and Figure A.1.
3.4
centre-to-face dimension
CTF
distance, between the plane located at the extremity of either body end port and
perpendicular to its axis and the other body end port axis
Note 1 to entry: Dimensions are expressed in millimetres.
Note 2 to entry: See Figures 1 to 5 and Figure A.1.
4 Dimensions and tolerances
The basic series of FTF and CTF dimensions, expressed in millimetres, shall be as given in Table 1.
Table 1 is a summary of the dimensions in Tables 2 to 19 giving the origin of each series and should be
referred to when considering valve types not covered by this document. Each particular column does
not necessarily include all the values of the relevant basic series. See Annex C for information as to the
origin of each basic series.
Tables 17 and 18 cover butterfly check or wafer check valves which are retained in the piping by bolting
that spans the two adjacent flanges, however these valves may alternately be furnished with full end
flanges as shown in the table notes. Check valves shown as ‘long pattern’ shall be furnished with full
end flanges only.
The face-to-face and centre-to-face dimensions, as appropriate for the types of valves covered by this
document, shall be in accordance with Tables 2 to 19, and the tolerances shall be in accordance with
Tables 20 and 21. Annex A includes additional information on face­to­face and centre­to­face dimensions
where ring joint facing is used and shall be followed.
Tolerances on FTF and CTF dimensions as shown in Figure 1 are given in Table 20. Both tolerances shall
be fulfilled.
2 © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Key
a face­to­face (FTF)
b centre­to­face (CTF)
Figure 1 — Face to face and centre to face dimensions
a) b)
Key
a face­to­face (FTF)
Figure 2 — Flanged valves PN and Class designated (flat and raised faces)
a) b) c) d) e) f)
© ISO 2021 – All rights reserved 3

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ISO/FDIS 5752:2021(E)

Key
a face­to­face (FTF)
Figure 3 — Flanged valves PN designated (spigot and recess)
Class 150 and Class 300 Class 600 and above
a) Large or small male face
b) Large or small female face
c) Large or small tongue
d) Large or small groove
4 © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Key
a for dimensions, see Tables 2 to 19
b face­to­face (FTF)
c centre­to­face (CTF)
e height
NOTE For height e, see appropriate flange standard.
Figure 4 — Flanged valves Class designated
End flange seating surfaces shall be parallel or perpendicular. Tolerances “c” on parallel or perpendicular
surfaces as shown in Figure 5 are given in Table 21.
Figure 5 — Tolerances on parallelism and perpendicularity
© ISO 2021 – All rights reserved 5

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ISO/FDIS 5752:2021(E)

6 © ISO 2021 – All rights reserved
Table 1 — Dimensions of basic series (1-24)
Dimensions in millimetres
Nominal size Basic series DN
a a a a
DN NPS 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24
10 ⅜ 130 210 102 — — 108 90 105 102 51 130 — 115 — — – 80 — — — — 10
b
15 ½ 130 210 108 140 165 108 90 105 108 57 130 — 115 — — 140 80 140 — 108 83 15
b
20 ¾ 150 230 117 152 190 117 95 115 117 64 130 — 120 — — 152 90 152 25 117 95 20
c
25 1 160 230 127 165 216 127 100 115 127 70 140 — 125 120 — 165 100 165 25 216 108 25
d
32 1 ¼ 180 260 140 178 229 146 105 130 140 76 165 — 130 140 — 178 110 178 33 229 114 32
e
40 1 ½ 200 260 165 190 241 159 115 130 165 83 165 106 140 240 33 190 120 190 33 241 121 40
50 2 230 300 178 216 292 190 125 150 203 102 203 108 150 250 43 216 135 216 43 267 146 50
65 2 ½ 290 340 190 241 330 216 145 170 216 108 222 112 170 270 46 241 165 241 46 292 165 65
80 3 310 380 203 283 356 254 155 190 241 121 241 114 180 280 64 283 185 283 46 318 178 80
100 4 350 430 229 305 432 305 175 215 292 146 305 127 190 300 64 305 229 305 52 356 216 100
g
125 5 400 500 254 381 508 356 200 250 330 178 356 140 200 325 70 381 — 381 56 400 254 125
h
150 6 480 550 267 403 559 406 225 275 356 203 394 140 210 350 76 403 — 403 56 444 279 150
f
200 8 600 650 292 419 660 521 275 325 495 248 457 152 230 400 89 502 — 419 60 533 330 200
250 10 730 775 330 457 787 635 325 — 622 311 533 165 250 450 114 568 — 457 68 622 394 250
300 12 850 900 356 502 838 749 375 — 698 349 610 178 270 500 114 648 — 502 78 711 419 300
350 14 980 1 025 381 762 889 — 425 — 787 394 686 190 290 550 127 762 — 572 78 838 — 350
i
400 16 1 100 1 150 406 838 991 — 475 575 864 457 762 216 310 600 140 838 — 610 102 864 — 400
450 18 1 200 1 275 432 914 1 092 — 500 — 978 483 864 222 330 650 152 914 — 660 114 978 — 450
500 20 1 250 1 400 457 991 1 194 — — 700 978 — 914 229 350 700 152 991 — 711 127 1 016 — 500
600 24 1 450 1 650 508 1 143 1 397 — — — 1 295 — 1 067 267 390 800 178 1 143 — 787 154 1 346 — 600
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.
b
For swing check valve only. For globe valve use152 for DN15 and 178 for DN20.
c
For swing check valve only. For globe valve use 203.
d
For swing check valve only. For globe valve use 216.
e
For swing check valve only. For globe valve use 229.
f
For swing check valve only. For globe valve use 559.
g
For swing check valve only. For globe valve use 356.
h
For swing check valve only. For globe valve use 406.
i
For swing check valve only. For globe valve use 914.

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ISO/FDIS 5752:2021(E)

© ISO 2021 – All rights reserved 7
Table 1 (continued)
Nominal size Basic series DN
a a a a
DN NPS 1 2 3 4 5 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 24
650 26 — — 559 1 245 1 448 — — — 1 295 — 1 143 — — — — 1 245 — — — 1 346 — 650
700 28 1 650 — 610 1 346 1 549 — — — 1 448 — — 292 430 900 229 1 346 — — 165 1 499 — 700
750 30 1 750 — 610 1 397 1 651 — — — 1 524 — 1 295 — — 950 230 1 397 — — 190 1 594 — 750
800 32 1 850 — 660 1 524 1 778 — — — 1 676 — — 318 470 1 000 241 1 524 — — 190 1 778 — 800
900 36 2 050 — 711 1 727 2 083 — — — 1 956 — 1 600 330 510 1 100 241 1 727 — — 203 2 083 — 900
1 000 40 2 250 — 813 — — — — — — — — 410 550 1 200 300 — — — 216 — — 1 000
1 050 42 — — — — — — — — — — — — — — — — — — — — — 1 050
1 200 48 — — — — — — — — — — — 470 630 — 350 — — — 254 — — 1 200
1 400 56 — — — — — — — — — — — 530 710 — 390 — — — — — — 1 400
1 600 64 — — — — — — — — — — — 600 790 — 440 — — — — — — 1 600
1 800 72 — — — — — — — — — — — 670 870 — 490 — — — — — — 1 800
2 000 80 — — — — — — — — — — — 760 950 — 540 — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.
b
For swing check valve only. For globe valve use152 for DN15 and 178 for DN20.
c
For swing check valve only. For globe valve use 203.
d
For swing check valve only. For globe valve use 216.
e
For swing check valve only. For globe valve use 229.
f
For swing check valve only. For globe valve use 559.
g
For swing check valve only. For globe valve use 356.
h
For swing check valve only. For globe valve use 406.
i
For swing check valve only. For globe valve use 914.

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ISO/FDIS 5752:2021(E)

8 © ISO 2021 – All rights reserved
Table 1 — (25-71) (continued)
Nominal size Basic series DN
a a a a
DN NPS 25 26 27 28 32 48 54 55 56 57 58 59 69 70 71
10 ⅜ — — 115 130 — — — — — — — — — — — 10
15 ½ — — 115 130 76 — — 216 264 — 108 132 — — — 15
20 ¾ — — 120 150 89 — 229 229 273 114 114 137 — — — 20
25 1 — — 125 160 102 — 254 254 308 127 127 154 140 140 186 25
32 1 ¼ — — 130 180 108 — 279 279 349 140 140 175 165 165 232 32
40 1 ½ 37 240 140 200 114 180 305 305 384 152 152 192 178 178 232 40
50 2 44 250 150 230 133 200 368 368 451 184 184 226 216 216 279 50
65 2 ½ 49 290 170 290 146 240 419 419 508 210 210 254 254 254 330 65
80 3 49 310 180 310 159 260 381 470 578 190 235 289 305 305 368 80
100 4 56 350 190 350 178 300 457 546 673 229 273 337 356 406 457 100
125 5 64 400 325 400 200 350 559 673 794 279 337 397 432 483 533 125
150 6 70 450 350 450 222 400 610 705 914 305 353 457 508 559 610 150
200 8 71 550 400 550 279 500 737 832 1 022 368 416 511 660 711 762 200
250 10 76 650 450 650 311 600 838 991 1 270 419 495 635 787 864 914 250
300 12 83 750 500 750 356 700 965 1 130 1 422 483 565 711 914 991 1 041 300
350 14 92 850 550 850 — 800 1 029 1 257 — 514 629 — 991 1 067 1 118 350
400 16 102 950 762 950 — 900 1 130 1 384 — 660 — — 1 092 1 194 1 245 400
450 18 114 1 050 — — — 1 000 1 219 1 537 — 737 — — — 1 346 1 397 450
500 20 127 1 150 914 1 150 — 1 100 1 321 1 664 — 826 — 1 650 — 1 473 — 500
600 24 154 1 350 — — — 1 300 1 549 1 943 — 991 — — — — — 600
650 26 — — — — — — — — — — — — — — — 650
700 28 — 1 550 — — — 1 500 — — — — — — — — — 700
750 30 — — — — — — — — — — — — — — — 750
800 32 — 1 750 — — — 1 700 — — — — — — — — — 800
900 36 — 1 950 — — — 1 900 — — — — — — — — — 900
1 000 40 — 2 150 — — — 2 100 — — — — — — — — — 1 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO/FDIS 5752:2021(E)

© ISO 2021 – All rights reserved 9
Table 1 (continued)
Nominal size Basic series DN
a a a a
DN NPS 25 26 27 28 32 48 54 55 56 57 58 59 69 70 71
1 050 42 — — — — — — — — — — — — — — — 1 050
1 200 48 — — — — — — — — — — — — — — — 1 200
1 400 56 — — — — — — — — — — — — — — — 1 400
1 600 64 — — — — — — — — — — — — — — — 1 600
1 800 72 — — — — — — — — — — — — — — — 1 800
2 000 80 — — — — — — — — — — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO/FDIS 5752:2021(E)

10 © ISO 2021 – All rights reserved
Table 1 — (91-132) (continued)
Nominal size Basic series DN
a
DN NPS 91 92 93 98 99 109 110 119 120 121 126 127 128 130 131 132
10 ⅜ — 230 115 65 — — — — — — — — — — — — 10
15 ½ — 230 115 65 — — — — — — — — — — — — 15
20 ¾ — 260 130 65 — — — — — — — — — — — — 20
25 1 — 260 130 65 — — — — — — — — — — — — 25
32 1 ¼ — 300 150 80 — — — — — — — — — — — — 32
40 1 ½ 310 300 150 85 270 — — — — — — — — — — — 40
50 2 350 350 175 100 300 — — 60 60 60 70 70 70 114 121 165 50
65 2 ½ 425 400 200 130 360 — — 67 67 67 83 83 83 — — — 65
80 3 470 450 225 160 390 48 54 73 73 73 83 83 86 121 143 165 80
100 4 550 520 260 190 450 54 64 73 73 79 102 102 105 121 165 197 100
125 5 650 600 300 240 525 — — — — — — — — — — — 125
150 6 750 700 350 250 600 59 78 98 98 136 159 159 159 130 194 219 150
200 8 950 800 400 320 750 73 102 127 127 165 206 206 206 152 219 254 200
250 10 1 150 900 — — 900 83 117 146 146 213 241 248 254 178 244 267 250
300 12 1 350 1 050 — — 1 050 92 140 181 181 229 292 305 305 — — — 300
350 14 1 550 — — — 1 200 117 155 184 222 273 356 356 — — — — 350
400 16 1 750 — — — 1 350 133 178 191 232 305 384 384 — — — — 400
450 18 1 950 — — — 1 500 149 200 203 264 362 451 468 — — — — 450
500 20 2 150 — — — 1 650 159 216 219 292 368 451 533 — — — — 500
600 24 — — — — — 181 232 222 318 438 495 559 — — — — 600
650 26 — — — — — — — 222 318 457 533 — — — — — 650
700 28 — — — — — — — 305 368 483 572 — — — — — 700
750 30 — — — — — — — 305 368 505 635 — — — — — 750
800 32 — — — — — — — 356 368 533 660 — — — — — 800
900 36 — — — — — — — 368 483 635 718 — — — — — 900
1 000 40 — — — — — — — 432 546 660 762 — — — — — 1 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO/FDIS 5752:2021(E)

© ISO 2021 – All rights reserved 11
Table 1 (continued)
Nominal size Basic series DN
a
DN NPS 91 92 93 98 99 109 110 119 120 121 126 127 128 130 131 132
1 050 42 — — — — — — — 432 568 701 787 — — — — — 1 050
1 200 48 — — — — — — — 524 629 787 — — — — — — 1 200
1 400 56 — — — — — — — — — — — — — — — — 1 400
1 600 64 — — — — — — — — — — — — — — — — 1 600
1 800 72 — — — — — — — — — — — — — — — — 1 800
2 000 80 — — — — — — — — — — — — — — — — 2 000
NOTE See informative Annex C for the origin of the basic series.
a
 CTF dimensions for angle pattern valves.

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ISO/FDIS 5752:2021(E)

Table 2 — Gate valves — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 250
DN NPS PN 6 – 10 – 16 PN 25 – 40 PN 63 – 100 PN 160 – 250
– 320 – 400
Basic series 3 14 15 15 26 26 99 91
10 ⅜ 102 115 — — — — — —
15 ½ 108 115 — — — — — —
20 ¾ 117 120 — — — — — —
25 1 127 125 120 — — — — —
32 1 ¼ 140 130 140 — — — — —
40 1 ½ 165 140 240 240 240 240 270 310
50 2 178 150 250 250 250 250 300 350
65 2 ½ 190 170 270 290 290 290 360 425
80 3 203 180 280 310 310 310 390 470
100 4 229 190 300 350 350 350 450 550
125 5 254 200 325 400 400 400 525 650
150 6 267 210 350 450 450 450 600 750
200 8 292 230 400 550 550 550 750 950
250 10 330 250 450 650 650 650 900 1 150
300 12 356 270 500 750 750 750 1 050 1 350
350 14 381 290 550 850 850 850 1 200 1 550
400 16 406 310 600 950 950 950 1 350 1 750
450 18 432 330 650 1 050 1 050 1 050 1 500 1 950
500 20 457 350 700 1 150 1 150 1 150 1 650 2 150
600 24 508 — 800 1 350 1 350 1 350 — —
650 26 559 — — — — — — —
700 28 610 — 900 1 550 1 550 1 550 — —
750 30 610 — 950 — — — — —
800 32 660 — 1 000 1 750 1 750 1 750 — —
900 36 711 — 1 100 1 950 1 950 1 950 — —
1 000 40 813 — 1 200 2 150 2 150 2 150 — —
1 050 42 — — — — — — —
1 200 48 — — — — — — —
Table 3 — Gate valves — Class rating
Nominal size Face-to-face dimensions
Class Class 900 Class 1500 Class 2500
Class Class Class
DN NPS 125-
250 300 600
Short Long Short Long Short Long
150
Basic series 3 19 4 5 69 54 70 55 71 56
10 ⅜ 102 — — — — — — — — —
15 ½ 108 — 140 165 — — — 216 — 264
20 ¾ 117 — 152 190 — 229 — 229 — 273
25 1 127 — 165 216 140 254 140 254 186 308
32 1 ¼ 140 — 178 229 165 279 165 279 232 349
12 © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Table 3 (continued)
Nominal size Face-to-face dimensions
Class Class 900 Class 1500 Class 2500
Class Class Class
DN NPS 125-
250 300 600
Short Long Short Long Short Long
150
Basic series 3 19 4 5 69 54 70 55 71 56
40 1 ½ 165 — 190 241 178 305 178 305 232 384
50 2 178 216 216 292 216 368 216 368 279 451
65 2 ½ 190 241 241 330 254 419 254 419 330 508
80 3 203 283 283 356 305 381 305 470 368 578
100 4 229 305 305 432 356 457 406 546 457 673
125 5 254 381 381 508 432 551 483 673 533 794
150 6 267 403 403 559 508 610 559 705 610 914
200 8 292 419 419 660 660 737 711 832 762 1 022
250 10 330 457 457 787 787 838 864 991 914 1 270
300 12 356 502 502 838 914 965 991 1 130 1 061 1 422
350 14 381 572 762 889 991 1 029 1 067 1 257 1 118 —
400 16 406 610 838 991 1 092 1 130 1 194 1 384 1 245 —
450 18 432 660 914 1 092 — 1 219 1 346 1 537 1 397 —
500 20 457 711 991 1 194 — 1 321 1 473 1 664 — —
600 24 508 787 1 143 1 397 — 1 549 — 1 943 — —
650 26 559 — 1 245 1 448 — — — — — —
700 28 610 — 1 346 1 549 — — — — — —
750 30 610 — 1 397 1 651 — — — — — —
800 32 660 — 1 524 1 778 — — — — — —
900 36 711 — 1 727 2 083 — — — — — —
1 000 40 813 — — — — — — — — —
1 050 42 — — — — — — — — — —
1 200 48 — — — — — — — — — —
Table 4 — Butterfly valves — Flange type — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10 –16 - 25 - 40
DN NPS PN 63 – 100
Short series Long series
Basic series 13 14 14
25 1 — — 125
32 1 ¼ — — 130
40 1 ½ 106 140 140
50 2 108 150 150
65 2 ½ 112 170 170
80 3 114 180 180
100 4 127 190 190
125 5 140 200 —
150 6 140 210 210
200 8 152 230 230
© ISO 2021 – All rights reserved 13

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ISO/FDIS 5752:2021(E)

Table 4 (continued)
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10 –16 - 25 - 40
DN NPS PN 63 – 100
Short series Long series
Basic series 13 14 14
250 10 165 250 250
300 12 178 270 270
350 14 190 290 290
400 16 216 310 310
450 18 222 330 330
500 20 229 350 350
600 24 267 390 390
650 26 292 410 —
700 28 292 430 —
750 30 318 450 —
800 32 318 470 —
900 36 330 510 —
1 000 40 410 550 —
1 050 42 410 570 —
1 200 48 470 630 —
1 400 56 530 710 —
1 600 64 600 790 —
1 800 72 670 870 —
2 000 80 760 950 —
Table 5 — Butterfly valves — Flange type — Class rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
Class 125 – 150
DN NPS Class 250 – 300 Class 600
Short Long
Basic series 13 14 14 14
40 1 ½ 106 140 140 140
50 2 108 150 150 150
65 2 ½ 112 170 170 170
80 3 114 180 180 180
100 4 127 190 190 190
125 5 140 200 200 200
150 6 140 210 210 210
200 8 152 230 230 230
250 10 165 250 250 250
300 12 178 270 270 270
350 14 190 290 290 290
400 16 216 310 310 310
450 18 222 330 330 330
500 20 229 350 350 350
600 24 267 390 390 390
14 © ISO 2021 – All rights reserved

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ISO/FDIS 5752:2021(E)

Table 5 (continued)
Nominal size Face-to-face dimensions
Class 125 – 150
DN NPS Class 250 – 300 Class 600
Short Long
Basic series 13 14 14 14
650 26 292 410 410 —
700 28 292 430 430 —
750 30 318 450 450 —
800 32 318 470 470 —
900 36 330 510 510 —
1 000 40 410 550 550 —
1 050 42 410 570 570 —
1 200 48 470 630 630 —
1 400 56 530 710 710 —
1 600 64 600 790 790 —
1 800 72 670 870 870 —
2 000 80 760 950 950 —
Table 6 — Butterfly valves — Wafer type — PN rating
Dimensions in millimetres
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10
PN 10 –16- 25 - 40 PN 63 – 100
–16 – 25 – 40
DN NPS
Short Medium Long
Basic series 20 25 16 110
25 1 33 — 33 —
32 1 ¼ 33 — 33 —
40 1 ½ 33 37 33 —
50 2 43 44 43 —
65 2 ½ 46 49 46 —
80 3 46 49 64 54
100 4 52 56 64 64
125 5 56 64 70 —
150 6 56 70 76 78
200 8 60 71 89 102
250 10 68 76 114 117
300 12 78 83 114 140
350 14 78 92 127 155
400 16 102 102 140 178
450 18 114 114 152 200
500 20 127 127 152 216
600 24 154 154 178 232
650 26 — — — —
700 28 165 — 229 —
750 30 190 165 230 —
800 32 190 — 241 —
© ISO 2021 – All rights reserved 15

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ISO/FDIS 5752:2021(E)

Table 6 (continued)
Nominal size Face-to-face dimensions
PN 2,5 – 6 – 10
PN 10 –16- 25 - 40 PN 63 – 100
–16 – 25 – 40
DN NPS
Short Medium Long
Basic series 20 25 16 110
900
...