1、Safety devices for protectionagainst excessive pressurePart 1: Safety valvesBS EN ISO 4126-1:2013+A1:2016Incorporating corrigendum October 2013(ISO 4126-1:2013)BSI Standards PublicationBS EN ISO 4126-1:2013+A1:2016 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of EN
2、 ISO 4126-1:2013+A1:2016. It supersedes BS EN ISO 4126-1:2013 which is withdrawn.The UK participation in its preparation was entrusted to Technical Committee PSE/18, Industrial valves, steam traps, actuators and safety devices against excessive pressure to PSE/18/6, Industrial valves, steam traps, a
3、ctuators and safety devices against excessive pressure Valve actuators.A list of organizations represented on this subcommittee can be obtained on request to its secretary.Additional informationAttention is drawn to 6.2 and the implications that hydrostatic pressure testing may be waived for certain
4、 types of safety valves. This might result in manufacturers using this standard failing to meet the essential safety requirements of 3.2.2, in the Pressure Equipment Regulations 1999 (as amended). This matter was raised with the Commission Working Group “Pressure” and a guideline issued to clarify t
5、he position (WGP Guideline 8/14 can be found on the European Commission website, http:/ec.europa.eu/enterprise).Attention is drawn to National Annex NA (informative) and National Annex NB (informative), which are based on BS 6759-1:1984, BS 6759-2:1984 and BS 6759-3:1984. National Annex NA gives adv
6、ice on performance testing of safety valves for hot water duty for UK users of this European Standard, and enables type test approval to be obtained. National Annex NB provides further supplementary information on materials, springs and the operating system, and guidance on safety valve mounting and
7、 installation.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards Institution 2016. Published by BSI Standards Limited 2016ISBN 978 0 580 92386 9ICS 13.240Compliance with a British Standard
8、cannot confer immunity from legal obligations.This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2013.Amendments/corrigenda issued since publicationDate Text affected31 October 2013 National Annex NA implemented, additional National f
9、oreword text added31 August 2016 Implementation of ISO amendment 1:2016 with CEN endorsement A1:2016: Subclause 7.2.1 updatedEUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4126-1 July 2013 ICS 13.240 Supersedes EN ISO 4126-1:2004English Version Safety devices for protection against excessi
10、ve pressure - Part 1: Safety valves (ISO 4126-1:2013) Dispositifs de scurit pour protection contre les pressions excessives - Partie 1: Soupapes de sret (ISO 4126-1:2013) Sicherheitseinrichtungen gegen unzulssigen berdruck - Teil 1: Sicherheitsventile (ISO 4126-1:2013) This European Standard was app
11、roved by CEN on 28 December 2012. 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 natio
12、nal 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 langua
13、ge and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece,
14、Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Mana
15、gement Centre: Avenue Marnix 17, B-1000 Brussels 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4126-1:2013: EEN ISO 4126-1:2013+A1June 2016ForewordThis document (EN ISO 4126-1:2013) has been prepared by Technical Committ
16、ee ISO/TC 185 “Safety devices for protection against excessive pressure“ in collaboration with 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 tex
17、t or by endorsement, at the latest by January 2014, and conflicting national standards shall be withdrawn at the latest by January 2014.Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsib
18、le for identifying any or all such patent rights.This document supersedes EN ISO 4126-1:2004.This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s).For relationship with E
19、U Directive(s), see informative Annex ZA, which is an integral part of this document.According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Re
20、public, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom.End
21、orsement noticeThe text of ISO 4126-1:2013 has been approved by CEN as EN ISO 4126-1:2013 without any modification.iiBS EN ISO 4126-1:2013+A1:2016 vstxstrsustrsx iiiBS EN ISO 4126-1:2013+A1:2016 vstxstrsustrsx This document (EN ISO 4126-1:2013/A1:2016) has been prepared by Technical Committee ISO/TC
22、 185 “Safety devices for protection against excessive pressure“ in collaboration with Technical Committee CEN/TC 69 “Industrial valves” the secretariat of which is held by AFNOR. This Amendment to the European Standard EN ISO 4126-1:2013 shall be given the status of a national standard, either by pu
23、blication of an identical text or by endorsement, at the latest by December 2016, and conflicting national standards shall be withdrawn at the latest by December 2016. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CEN
24、ELEC shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate 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,
25、see informative Annex ZA, which is an integral part of EN ISO 4126-1:2013. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, De
26、nmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. Endorsement
27、notice The text of ISO 4126-1:2013/Amd 1:2016 has been approved by CEN as EN ISO 4126-1:2013/A1:2016 without any modification. sAnnex ZA(informative)Relationship between this International Standard and the Essential Requirements of EU Directive 97/23/EC (PED)By agreement between ISO and CEN, this CE
28、N annex is included in the DIS and the FDIS but will not appear in the published ISO standard.This International Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association to provide one means of conforming to Essential Requirements of
29、the New Approach Directive 97/23/EC (PED).Once this standard is cited in the Official Journal of the European Communities under that Directive and has been implemented as a national standard in at least one Member State, compliance with the normative clauses of this standard given in Table ZA.1 conf
30、ers, within the limits of the scope of this standard, a presumption of conformity with the corresponding Essential Requirements of that Directive and associated EFTA regulations.Table ZA.1 Correspondence between this International Standard and Directive 97/23/EC (PED)Sub-clauses of this Internationa
31、l StandardEssential Requirements of Directive 97/23/EC (PED)Essential Requirements Annex I of PED5,6,7,8,9 Safety accessories 2.11.15.1.5 Safety of operation 2.35.1.6 Drain and venting 2.56.3 Proof test 3.2.210 Marking and labelling 3.3WARNING: Other requirements and other EU Directives may be appli
32、cable to the products falling within the scope of this standard.ivBS EN ISO 4126-1:2013+A1:2016 vstxstrsustrsx BS EN ISO 4126-1:2013ISO 4126-1:2013(E) ISO 2013 All rights reserved iiiContents PageForeword iv1 Scope .12 Normative references 13 Terms and deinitions .14 Symbols and units .45 Design 45.
33、1 General .45.2 Valve end connections 55.3 Minimum requirements for springs .55.4 Materials .66 Production testing 66.1 Purpose 66.2 General .66.3 Hydrostatic testing 66.4 Pneumatic testing .76.5 Adjustment of set or cold differential test pressure .86.6 Seat leakage test.87 Type testing87.1 General
34、 .87.2 Tests to determine operating characteristics .97.3 Tests to determine nulllow characteristics117.4 Determination of the coefnullicient of discharge .127.5 Certinullication of coefnullicient of discharge 128 Determination of safety valve performance .139 Sizing of safety valves .1310 Marking a
35、nd sealing .1310.1 Marking 1310.2 Sealing of a safety valve 13Bibliography .14BS EN ISO 4126-1:2013+A1:2016 vstxstrsustrsx v ISO 2013 All rights r edviBS EN ISO 4126-1:2013ISO 4126-1:2013(E)ForewordISO (the International Organization for Standardization) is a worldwide federation of national standar
36、ds 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 organi
37、zations, 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.International Standards are drafted in accordance with the rules given in
38、the ISO/IEC Directives, Part 2.The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of
39、 the member bodies casting a vote.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.ISO 4126-1 was prepared by Technical Committee ISO/TC 185, Safety de
40、vices for protection against excessive pressure.This third edition cancels and replaces the second edition (ISO 4126-1:2004), which has been technically revised. It also incorporates the Technical Corrigendum ISO 4126-1:2004/Cor.1:2007.ISO 4126 consists of the following parts, under the general titl
41、e Safety devices for protection against excessive pressure: Part 1: Safety valves Part 2: Bursting disc safety devices Part 3: Safety valves and bursting disc safety devices in combination Part 4: Pilot operated safety valves Part 5: Controlled safety pressure relief systems (CSPRS) Part 6: Applicat
42、ion, selection and installation of bursting disc safety devices Part 7: Common data Part 9: Application and installation of safety devices excluding stand-alone bursting disc safety devices Part 1v: Si ing of safety valves for gas liuid to-pase lo Part 11: Performance testing1)Part 7 contains data t
43、hat is common to more than one of the parts of ISO 4126 to avoid unnecessary repetition.1) Under preparation.iv ISO 2013 All rights reservedBS EN ISO 4126-1:2013+A1:2016 vstxstrsustrsx vi ISO 2013 All rights r BS EN ISO 4126-1:2013INTERNATIONAL STANDARD ISO 4126-1:2013(E)Safety devices for protectio
44、n against excessive pressure Part 1: Safety valves1 ScopeThis part of ISO 4126 specinullies general requirements for safety valves irrespective of the nullluid for which they are designed.It is applicable to safety valves having a nulllow diameter of 4 mm and above which are for use at set pressures
45、 of 0,1 bar gauge and above. No limitation is placed on temperature.This is a product standard and is not applicable to applications of safety valves.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated references, only the editio
46、n cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 4126-7:2013, Safety devices for protection against excessive pressure Part 7: Common data3 Terms and deinitionsFor the purposes of this document, the following terms and denu
47、llinitions apply.3.1safety valvevalve which automatically, without the assistance of any energy other than that of the nullluid concerned, discharges a quantity of the nullluid so as to prevent a predetermined safe pressure being exceeded, and which is designed to re-close and prevent further nulllo
48、w of nullluid after normal pressure conditions of service have been restoredNote 1 to entry: The valve can be characterized either by pop action (rapid opening) or by opening in proportion (not necessarily linear) to the increase in pressure over the set pressure.3.2direct loaded safety valvesafety valve in which the loading due to the nullluid pressure underneath the valve disc is opposed only by a direct mechanical loading device such as a weight, lever and weight, or spring3.3assisted safety
