prEN 593
(Main)Industrial valves - Metallic butterfly valves
Industrial valves - Metallic butterfly valves
This document specifies minimum requirements applicable to design, final assessment, designation, marking and documentation for butterfly valves having metallic bodies for use with all type of pipe end connections (e.g. wafer, lug, flange, butt welding) and used for isolating, regulating or control applications.
The PN and Class ranges are:
— PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40; PN 63; PN 100; PN 160;
— Class 150; Class 300; Class 600; Class 900.
The size range is:
— 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 1 050; DN 1 100; DN 1 200; DN 1 400; DN 1 500; DN 1 600; DN 1 800; DN 2 000; DN 2 200; DN 2 400; DN 2 600; DN 2 800; DN 3 000; DN 3 200; DN 3 400; DN 3 600; DN 3 800; DN 4 000.
DN 750 and DN 1 050 are used only for Class 150 and Class 300.
Intermediate DNs are allowed upon agreement at the time of order.
Potential fields of application and their application standards that apply together with this document are listed below:
— applications with a maximum allowable pressure PS greater than 0,5 bar in accordance with the European legislation for pressure equipment, the applicable provisions of EN 16668 apply;
NOTE 1 Exclusions are given in the European legislation for pressure equipment.
— chemical applications, the applicable provisions of EN 12569 apply;
— gas distribution systems, the applicable provisions of EN 13774 apply;
— water supply application, the provisions of EN 1074-1 and EN 1074-2 apply;
— process control application, the provisions of EN 1349 and EN 60534-2-1 apply.
NOTE 2 The minimum requirements specified in Clauses 4, 5, 6, 7.1 and 8 are considered as "sound engineering practice" and are to be taken into account to ensure safe use.
NOTE 3 The range of DN, applicable to each PN, for wafer and wafer lug valve types is as given in the appropriate part of EN 1092 for Type 11 flanges for the applicable material. The range of DN, applicable to each PN, for flanged valve types is as given in the appropriate part of EN 1092 for Type 21 flanges for the applicable material.
The correspondence between DN and NPS is given for information in Annex D.
Industriearmaturen - Metallische Klappen
Robinetterie industrielle - Robinets métalliques à papillon
Industrijski ventili - Kovinske zaporne lopute
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
01-junij-2025
Industrijski ventili - Kovinske zaporne lopute
Industrial valves - Metallic butterfly valves
Industriearmaturen - Metallische Klappen
Robinetterie industrielle - Robinets métalliques à papillon
Ta slovenski standard je istoveten z: prEN 593
ICS:
23.060.30 Zapirni ventili (zasuni) Gate valves
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2025
ICS Will supersede EN 593:2017
English Version
Industrial valves - Metallic butterfly valves
Robinetterie industrielle - Robinets métalliques à Industriearmaturen - Metallische Klappen
papillon
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 69.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CEN 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Türkiye and
United Kingdom.
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 supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 593:2025 E
worldwide for CEN national Members.
Contents Page
European foreword . 4
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Design requirements . 9
4.1 General . 9
4.2 Shell . 12
4.3 Body . 13
4.3.1 General . 13
4.3.2 End connections . 13
4.4 Obturator (disc) . 16
4.5 Seat seal . 16
4.6 Driving shaft . 16
4.7 Shaft seal . 16
4.8 Optional design features . 17
4.9 Materials . 18
4.9.1 Shell materials . 18
4.9.2 Trim materials . 18
4.9.3 Body and cover bolting material . 18
4.9.4 Corrosion protection. 19
4.10 Pressure/temperature ratings . 19
4.11 Dimensions and tolerances . 20
4.11.1 Face-to-face and end-to-end dimensions . 20
4.11.2 Body, flanged end . 20
4.11.3 Body, wafer/lug-type . 20
4.11.4 Body, butt welding end. 20
4.11.5 Threaded end. 20
4.12 Operation . 20
4.12.1 Operational capability . 20
4.12.2 Manual or power operating device . 21
4.13 Manufacturing . 22
4.13.1 Welding . 22
4.13.2 Non-destructive testing (NDT) of joint welding . 22
4.13.3 Heat treatment . 22
4.13.4 Traceability . 22
4.14 Functional characteristics and performances . 23
4.14.1 Application . 23
4.14.2 Flow characteristics . 23
4.15 Additional requirements for butterfly valves classified as pressure accessories in
accordance with EN 16668:2025 . 24
4.16 Additional requirements for butterfly valves intended to be used in other
applications . 24
5 Final assessment . 24
6 Designation . 25
7 Marking and preparation for storage and transportation . 25
7.1 Marking . 25
7.1.1 Mandatory marking . 25
7.1.2 Supplementary marking . 26
7.2 Preparation for storage and transportation . 26
8 Documentation . 26
Annex A (informative) Valve data sheet . 27
Annex B (informative) Trim material list . 29
Annex C (informative) Environmental corrosion protection . 30
Annex D (informative) Correspondence between DN and NPS . 31
Annex E (informative) Example for valve shaft calculation . 32
E.1 General . 32
E.2 Calculation. 33
E.2.1 Shear stress . 33
E.2.2 Combined shear stress (at valve bearing) (section 2-2). 33
E.2.3 Combined tensile stress at seating due to torsion and bending (section 2-2) . 33
E.2.4 Shear stress at reduced area (sections 1-1, 3-3, 4-4) . 34
E.3 Examples of influence of flow velocity/hydrodynamic torques for shaft sizing . 34
Annex F (informative) Relationship between this document and EN 16668:2025 . 37
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU (Pressure Equipment Directive) aimed to be
covered . 39
Bibliography . 41
European foreword
This document (prEN 593:2025) has been prepared by Technical Committee CEN/TC 69 “Industrial
valves”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 593:2017.
This document includes the following significant technical changes with respect to EN 593:2017:
a) inclusion of an introduction to explain the reason of this revision;
b) the inclusion of a sentence in the scope to clarify that this document applies to all industrial
applications;
c) addition of new 4.15 and 5.3 on the design requirements and final assessment for the European
legislation for pressure equipment;
d) addition of a new Clause 8 for the documentation;
e) addition of Annex F providing the relationship between the clauses/subclauses of this document and
those of EN 16668:2025;
f) update of Annex ZA.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
For the relationship with EU Legislation, see informative Annex ZA, which is an integral part of this
document.
Introduction
This document was revised to refer to EN 16668:2025 for those requirements related to the European
legislation for pressure equip
...
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