EN 16767:2020

Industrial valves - Metallic check valves

This document specifies the general requirements for metallic check valves, which are forged, cast or fabricated in straight, angle or oblique pattern (see EN 736‐2) with end connections flanged or wafer, butt welding, socket welding, or threaded.
This document applies to metallic check valves used for all industrial applications.
Additional requirements given in the relevant application standards may apply to check valves used for more specific applications (e.g. for the water industry, the chemical and petrochemical process industry, the gas distribution industry).
Sanitary check valves and back flow prevention anti-pollution check valves are excluded from the scope of this document.
NOTE 1   Double disc type and tilting disc type are also based on butterfly valve and are in the scope of this document.
The range of nominal sizes covered is:
-   DN 8, DN 10; DN 12, 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 1 200.
DN 8 and DN 12 are not used for PN designated flanged end connections.
DN 8, DN 10 and DN 12 are not used for Class designated flanged end connections.
DN 750 is used for Class designated check valves only.
Socket welding end check valves and threaded end check valves are limited to the range DN 8 to DN 65.
The range of nominal diameters for capillary and compression end valves is 6 mm to 110 mm.
The range of pressure designations covered is:
a)   for flanged end and wafer type end cast iron bodies:
-   PN 2,5; PN 6; PN 10; PN 16; PN 25;
-   Class 125; Class 250;
b)   for flanged end, wafer type and butt welding end bodies in steel materials:
-   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 150; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
c)   for socket welding end and threaded end bodies in steel materials:
-   PN 40; PN 63; PN 100;
-   Class 600; Class 800.
NOTE 2   Class 800 is a widely used Class designation for socket welding and threaded end check valves.
d)   for flanged end and wafer type bodies in copper alloy materials:
-   PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40;
-   Class 150; Class 300;
e)   for threaded end, capillary end and compression end bodies in copper alloy materials:
-   PN 16; PN 20; PN 25; PN 32; PN 40;
-   Class 125; Class 250.
The correspondence between DN and NPS is given for information in Annex B.

Industriearmaturen - Metallische Rückflussverhinderer

Dieses Dokument legt die allgemeinen Anforderungen an Rückflussverhinderer aus Metall mit gegossenem oder geschmiedetem Gehäuse oder Gehäuse in Durchgangsform, Eckform oder mit schrägem Oberteil (siehe EN 736 2), Flansch- oder Einklemmanschlüssen, Stumpf Schweißenden, Schweißmuffenenden oder Gewindeenden fest.
Dieses Dokument gilt für Rückflussverhinderer aus Metall, die für alle industriellen Anwendungsfälle verwendet werden.
Zusätzliche Anforderungen der jeweiligen Anwendungsnormen können für Rückflussverhinderer gelten, die für spezifischere Anwendungen verwendet werden (z. B. Wasserwirtschaft, chemische und petrochemische Verfahrensindustrie, Gasverteilung).
Sanitärrückflussverhinderer und Rückflussverhinderer zur Verhinderung von Verunreinigungen durch Rückfließen fallen nicht unter den Anwendungsbereich dieses Dokuments.
ANMERKUNG 1 Doppelscheiben und Rückschlagventile beruhen ebenfalls auf Klappen und liegen im Anwendungsbereich dieses Dokuments.
Der Nennweitenbereich umfasst:
- DN 8, DN 10; DN 12, 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 1 200.
DN 8 und DN 12 werden nicht für nach PN bezeichnete Flanschanschlüsse verwendet.
DN 8, DN 10 und DN 12 werden nicht für nach Class bezeichnete Flanschanschlüsse verwendet.
DN 750 gilt nur für Rückflussverhinderer mit Class-Bezeichnung.
Rückflussverhinderer mit Schweißmuffenenden und Rückflussverhinderer mit Gewindeenden sind auf den Bereich DN 8 bis DN 65 begrenzt.
Der Nennweitenbereich für Rückflussverhinderer mit Kapillar-Lötenden und Klemmanschlussenden liegt zwischen 6 mm und 110 mm.
Der Druckbereich umfasst:
a) für Gehäuse aus Gusseisen mit Flanschanschlüssen und Einklemmanschlüssen:
- PN 2,5; PN 6; PN 10; PN 16; PN 25;
- Class 125; Class 250;
b) für Gehäuse aus Stahl mit Flanschanschlüssen, Einklemmanschlüssen und Stumpf Schweißenden:
- 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 150; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
c) für Gehäuse aus Stahl mit Schweißmuffenenden und Gewindeenden :
- PN 40; PN 63; PN 100;
- Class 600; Class 800.
ANMERKUNG 2 Class 800 ist eine für Rückflussverhinderer mit Schweißmuffenenden und Gewindeenden häufig verwendete Class-Bezeichnung.
d) für Gehäuse aus Kupferlegierungen mit Flanschanschlüssen und Einklemmanschlüssen:
- PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40;
- Class 150; Class 300;
e) für Gehäuse aus Kupferlegierungen mit Gewindeenden, Kapillar-Lötenden und Klemmanschlussenden:
- PN 16; PN 20; PN 25; PN 32; PN 40;
- Class 125; Class 250.
Der Zusammenhang zwischen DN und NPS wird zu Informationszwecken in Anhang B angegeben.

Robinetterie industrielle - Clapets de non-retour métalliques

Le présent document spécifie les exigences générales pour les clapets de non-retour métalliques, qui sont forgés, coulés ou façonnés, de forme droite, d’équerre ou oblique (voir l’EN 736-2), à extrémités à brides ou à insérer, à souder en bout, à emboîter et à souder ou filetées.
Le présent document s’applique aux clapets de non-retour métalliques utilisés dans toutes les applications industrielles.
Des exigences supplémentaires données dans les normes d'application pertinentes peuvent s'appliquer aux clapets de non-retour utilisés dans des applications plus spécifiques (par exemple dans le secteur de l'eau, dans l'industrie de procédés chimiques et pétrochimiques, dans l'industrie de distribution du gaz).
Les clapets de non-retour sanitaires et destinés à éviter les pollutions liées à des retours d’écoulement sont exclus du domaine d’application de Le présent document.
NOTE 1   Les types à double battant et à papillon sont également basés sur les robinets à papillon et sont dans le domaine d'application du présent document.
La gamme des diamètres nominaux couverts est :
-   DN 8, DN 10; DN 12, 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 1 200.
Les DN 8 et DN 12 ne sont pas utilisés pour les extrémités à brides désignées PN.
Les DN 8, DN 10 et DN 12 ne sont pas utilisés pour les extrémités à brides désignées Class.
Le DN 750 est utilisé seulement pour les clapets de non-retour désignés Class.
Les clapets de non-retour à extrémités à emboîter et à souder et les clapets de non-retour à extrémités filetées sont limités à la gamme DN 8 à DN 65.
La gamme de diamètres nominaux des appareils de robinetterie à extrémité à braser par capillarité et à extrémité à compression est de 6 mm à 110 mm.
La gamme des pressions nominales couvertes est :
a)   pour les corps en fonte à extrémités à brides et à extrémités à insérer :
-   PN 2,5; PN 6; PN 10; PN 16; PN 25;
-   Class 125; Class 250;
b)   pour les corps en acier, à extrémités à brides, à extrémités à insérer et à extrémités à souder en bout:
-   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 150; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
c)   pour les corps en acier, à extrémités à emboîter et à souder et à extrémités filetées:
-   PN 40; PN 63; PN 100;
-   Class 600; Class 800.
NOTE 2   Class 800 est une désignation de Class largement utilisée pour les clapets de non-retour à extrémités à emboîter et à souder, et à extrémités filetées.
d)   pour les corps en alliages de cuivre, à extrémités à brides et à extrémités à insérer:
-   PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40;
-   Class 150; Class 300;
e)   pour les corps en alliages de cuivre, à extrémités filetées, à extrémité à braser par capillarité et à extrémité à compression:
-   PN 16; PN 20; PN 25; PN 32; PN 40;
-   Class 125; Class 250.
La correspondance entre DN et NPS est fournie pour information en Annexe B.

Industrijski ventili - Kovinski protipovratni ventili

General Information

• Status: Published
• Publication Date: 14-Apr-2020
• Withdrawal Date: 30-Oct-2020
• ICS: 23.060.50 - Check valves
• Technical Committee: CEN/TC 69 - Industrial valves
• Drafting Committee: CEN/TC 69 - Industrial valves
• Current Stage: 9060 - Closure of 2 Year Review Enquiry - Review Enquiry
• Start Date: 02-Dec-2025
• Completion Date: 02-Dec-2025
• Directive: 2014/68/EU - Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment
• Mandate: M/071 - Mandate to CEN for standardization in the field of Pressure equipment
• Ref Project: SIST EN 16767:2020 - Industrial valves - Metallic check valves

Relations

• Replaces: EN 16767:2016 - Industrial valves - Steel and cast iron check valves
• Effective Date: 22-Apr-2020

Overview

EN 16767:2020 - Industrial valves: Metallic check valves is a CEN European Standard that defines general requirements for metallic check valves used in industrial applications. It covers forged, cast or fabricated check valves in straight, angle or oblique patterns with end connections that are flanged, wafer, butt welding, socket welding or threaded. The standard applies broadly across industries (water, chemical, petrochemical, gas distribution, etc.) but excludes sanitary check valves and anti‑pollution backflow prevention devices.

Key topics and technical requirements

EN 16767:2020 specifies the essential design, material and testing requirements for metallic check valves, including:

• Scope and types
  • Includes axial, lift, swing, diaphragm, double disc and tilting disc (butterfly‑based) check valves.
  • Nominal sizes covered: DN 8 to DN 1200 (with specific limits for DN 6–110 mm capillary/compression, and restrictions for socket/threaded ends).
• Materials
  • Body and cover materials selected per EN 12516 series; copper alloys per EN 13547 allowed.
  • Internal parts in contact with fluid must have equal or better corrosion resistance than the body.
• Shell design strength
  • Wall thickness, body/bonnet joints and bolting determined by tabulation or calculation methods (EN 12516-1/2/4), with experimental validation options for limited PS × DN values.
• Pressure/temperature ratings
  • Pressure classes and PN designations for cast iron, steel and copper alloy bodies are defined (PN 2.5 up to PN 400; Class 125 up to Class 2500 depending on material and end type).
  • Low‑temperature provisions and material toughness requirements are included.
• Dimensions, operation & auxiliary connections
  • Face‑to‑face, end‑to‑end dimensions, and end‑connection standards are referenced (EN 558, EN 12627, EN 12760, etc.).
• Testing, marking and documentation
  • Test procedures and acceptance criteria referenced to EN 12266‑1.
  • Mandatory marking and purchaser information requirements; Annex B gives DN–NPS correspondence.

Practical applications and users

EN 16767:2020 is intended for:

• Valve manufacturers and designers specifying metallic check valves for industrial pipelines.
• Procurement and specification engineers preparing tender documents.
• Pipeline and plant designers in water, chemical, petrochemical and gas industries.
• Inspection, testing and certification bodies validating compliance with EU directives.

Using this standard ensures compatibility of check valves by nominal diameter (DN), end connection (flanged, wafer, welded, threaded) and pressure/temperature rating - helping to reduce specification errors, improve safety and support regulatory conformity.

Related standards

Key referenced standards include: EN 12516‑1/2/4, EN 12266‑1, EN 1092‑1/2/3, EN 558, EN 736‑1/2/3, EN 13547, EN 19 - all relevant when designing, testing or marking metallic check valves in accordance with EN 16767:2020.

Standards Content (Sample)

SLOVENSKI STANDARD
01-junij-2020
Nadomešča:
SIST EN 16767:2016
Industrijski ventili - Kovinski protipovratni ventili
Industrial valves - Metallic check valves
Industriearmaturen - Rückflussverhinderer aus Gusseisen und Stahl
Robinetterie industrielle - Clapets de non-retour métalliques
Ta slovenski standard je istoveten z: EN 16767:2020
ICS:
23.060.50 Blokirni ventili Check valves
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 16767
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 23.060.50 Supersedes EN 16767:2016
English Version
Industrial valves - Metallic check valves
Robinetterie industrielle - Clapets de non-retour Industriearmaturen - Metallische
métalliques Rückflussverhinderer
This European Standard was approved by CEN on 17 February 2020.

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, 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, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16767:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
1 Scope . 4
2 Normative references . 5
3 Terms and definitions . 6
4 Requirements . 7
4.1 General . 7
4.2 Design . 7
4.2.1 Shell design strength . 7
4.2.2 Materials . 7
4.2.3 Pressure/temperature ratings . 7
4.2.4 Dimensions . 9
4.2.5 Operation . 10
4.2.6 Auxiliary connections . 10
4.2.7 Permanent joining of the steel body . 10
4.3 Functional characteristics . 10
4.3.1 Seat leakage . 10
4.3.2 Flow characteristics . 11
4.3.3 Anti-blow out design . 11
5 Test procedures . 11
6 Declaration of compliance . 11
7 Designation. 12
8 Marking, preparation for storage and transportation . 12
8.1 Marking . 12
8.1.1 Mandatory marking. 12
8.1.2 Supplementary marking . 12
8.2 Preparation for storage and transportation . 13
Annex A (informative) Information to be supplied by the purchaser . 14
Annex B (informative) Correspondence between DN and NPS . 15
Annex ZA (informative) Relationship between this European Standard and the essential
requirements of Directive 2014/68/EU aimed to be covered . 16
Bibliography . 17

European foreword
This document (EN 16767:2020) 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 October 2020, and conflicting national standards shall
be withdrawn at the latest by October 2020.
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 16767:2016.
This document has been prepared under a standardization request given to CEN by the European
Commission and the European Free Trade Association, and supports essential requirements of
EU Directive.
For relationship with EU Directive, see informative Annex ZA, which is an integral part of this document.
The main changes are the following:
— inclusion of copper alloy check valves (in Clause 1 and in 4.2);
— update of the normative references;
— addition of informative Annex B giving the correspondence between DN and NPS;
— update of Annex ZA according to Directive 2014/68/EU.
According to the CEN-CENELEC Internal Regulations, the national standards organisations of the
following countries are bound to implement this European Standard: 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, Turkey and the United
Kingdom.
1 Scope
This document specifies the general requirements for metallic check valves, which are forged, cast or
fabricated in straight, angle or oblique pattern (see EN 736-2) with end connections flanged or wafer,
butt welding, socket welding, or threaded.
This document applies to metallic check valves used for all industrial applications.
Additional requirements given in the relevant application standards may apply to check valves used for
more specific applications (e.g. for the water industry, the chemical and petrochemical process industry,
the gas distribution industry).
Sanitary check valves and back flow prevention anti-pollution check valves are excluded from the scope
of this document.
NOTE 1 Double disc type and tilting disc type are also based on butterfly valve and are in the scope of this
document.
The range of nominal sizes covered is:
— DN 8, DN 10; DN 12, 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 1 200.
DN 8 and DN 12 are not used for PN designated flanged end connections.
DN 8, DN 10 and DN 12 are not used for Class designated flanged end connections.
DN 750 is used for Class designated check valves only.
Socket welding end check valves and threaded end check valves are limited to the range DN 8 to DN 65.
The range of nominal diameters for capillary and compression end valves is 6 mm to 110 mm.
The range of pressure designations covered is:
a) for flanged end and wafer type end cast iron bodies:
— PN 2,5; PN 6; PN 10; PN 16; PN 25;
— Class 125; Class 250;
b) for flanged end, wafer type and butt welding end bodies in steel materials:
— 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 150; Class 300; Class 600; Class 900; Class 1 500; Class 2 500;
c) for socket welding end and threaded end bodies in steel materials:
— PN 40; PN 63; PN 100;
— Class 600; Class 800.
NOTE 2 Class 800 is a widely used Class designation for socket welding and threaded end check valves.
d) for flanged end and wafer type bodies in copper alloy materials:
— PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40;
— Class 150; Class 300;
e) for threaded end, capillary end and compression end bodies in copper alloy materials:
— PN 16; PN 20; PN 25; PN 32; PN 40;
— Class 125; Class 250.
The correspondence between DN and NPS is given for information in Annex B.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
EN 19:2016, Industrial valves — Marking of metallic valves
EN 558:2017, Industrial valves — Face-to-face and centre-to-face dimensions of metal valves for use in
flanged pipe systems — PN and Class designated valves
EN 736-1:2018, Valves — Terminology — Part 1: Definition of types of valves
EN 736-2:2016, Valves — Terminology — Part 2: Definition of components of valves
EN 736-3:2008, Valves — Terminology — Part 3: Definition of terms
EN 1092-1:2018, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 1: Steel flanges
EN 1092-2:1997, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated — Part 2: Cast iron flanges
EN 1092-3:2003, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, PN
designated – Part 3: Copper alloy flanges
EN 1759-1:2004, Flanges and their joint — Circular flanges for pipes, valves, fittings and accessories, Class
designated — Part 1: Steel flanges, NPS 1/2 to 24
EN 1759-3:2003, Flanges and their joints — Circular flanges for pipes, valves, fittings and accessories, Class
designated — Part 3: Copper alloy flanges
EN 10269:2013, Steels and nickel alloys for fasteners with specified elevated and/or low temperature
properties
EN 12266-1:2012, Industrial valves — Testing of metallic valves — Part 1: Pressure tests, test procedures
and acceptance criteria — Mandatory requirements
EN 12351:2010, Industrial valves — Protective caps for valves with flanged connections
EN 12516-1:2014+A1:2018, Industrial valves — Shell design strength — Part 1: Tabulation method for
steel valve shells
EN 12516-2:2014, Industrial valves — Shell design strength — Part 2: Calculation method for steel valve
shells
EN 12516-4:2014+A1:2018, Industrial valves — Shell design strength — Part 4: Calculation method for
valve shells manufactured in metallic materials other than steel
EN 12627:2017, Industrial valves — Butt welding ends for steel valves
EN 12760:2016, Industrial valves — Socket welding ends for steel valves
EN 12982:2009, Industrial valves — End-to-end and centre-to-end dimensions for butt welding end valves
EN 13547:2013, Industrial valves — Copper alloy ball valves
EN 16722:2015, Industrial valves — End-to-end and centre-to-end dimensions for valves with threaded
ends
EN ISO 228-1:2003, Pipe threads where pressure-tight joints are not made on the threads — Part 1:
Dimensions, tolerances and designation (ISO 228-1:2000)
EN ISO 9606-1:2017, Qualification testing of welders — Fusion welding — Part 1: Steels (ISO 9606-1:2012
including Cor 1:2012 and Cor 2:2013)
EN ISO 14732:2013, Welding personnel — Qualification testing of welding operators and weld setters for
mechanized and automatic welding of metallic materials (ISO 14732:2013)
EN ISO 15607:2019, Specification and qualification of welding procedures for metallic materials — General
rules (ISO 15607:2019)
ISO 4200:1991, Plain end steel tubes, welded and seamless — General tables of dimensions and masses per
unit length
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 736-1, EN 736-2 and EN 736-3
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/
Note 1 to entry: EN 736-1 illustrates four basic types of check valves:
— the axial and lift types are based on the globe valve;
— the swing type is based on the butterfly valve and
— the diaphragm type is based on the diaphragm valve.
Other types of check valves are possible and are considered to be within the scope of this document.
4 Requirements
4.1 General
For information to be supplied by the purchaser, see Annex A.
4.2 Design
4.2.1 Shell design strength
The minimum body and bonnet wall thickness, the body/bonnet joint and bonnet bolting shall be
determined as follows:
a) for steel check valves designed by the tabulation method, it shall be according to EN 12516-
1:2014+A1:2018;
b) for steel check valves designed by the calculation method, it shall be according to EN 12516-2:2014;
c) for cast iron and copper alloy check valves designed by the calculation method, it shall be according
to EN 12516-4:2014+A1:2018;
d) for PS × DN < 3 000 a validation by an experimental method according to EN 12516-3 is possible,
otherwise the experimental method shall only be applied in addition to the tabulation or calculation
method.
4.2.2 Materials
4.2.2.1 The body and cover (if any) materials shall be selected from EN 12516-1:2014+A1:2018
and/or EN 12516-4:2014+A1:2018. Bolting (if any) materials shall be selected from EN 10269:2013. A
selection of bolts and nuts for flange connections, which may be used for the body and cover connection,
is indicated in EN 1515-4.
4.2.2.2 All copper alloy materials listed in Table A.2 of EN 13547:2013 are also possible.
4.2.2.3 All the internal parts in contact with the fluid shall be made of a material or coated with a
material whose corrosion resistance to the fluid being carried is at least equal to the body and bonnet
material. The manufacturer shall declare the materials of construction and any coatings of components
in contact with the line fluid from which the suitability of the check valve for the application can be
determined.
4.2.3 Pressure/temperature ratings
4.2.3.1 Steel body
The pressure/temperature ratings shall be as specified in EN 12516-1:2014+A1:2018 for the particular
body material group.
The pressure/temperature ratings applicable to Class 800 socket welding and threaded end check valves
shall be the Class 600 rating for the applicable material group multiplied by the ratio of 800/600.
4.2.3.2 Cas
...