BS EN ISO 4126-4:2013 BSl Standards Publication Safety devices for protection against excessive pressure Part 4: Pilot-operated safety valves bsi. ..making excellence a habit. BSENISO4126-4:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN ISO 4126-4:2013. It supersedes BS EN ISO 4126-4:2004 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee PSE/18/6, Industrial valves, steam traps, actuators and safety devices against excessive pressure -Safety devices against excessive pressure. A list of organizations represented on this committee can be obtained on request to its secretary. 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 2013. Published by BSI Standards Limited 2013 ISBN9780580665042 ICS 13.240 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committeeon31July 2013. Amendments issued sincepublication Date Text affected ENISO4126-4 EUROPEANSTANDARD NORMEEUROPEENNE EUROPAISCHENORM July 2013 ICS 13.240 Supersedes ENISO 4126-4:2004 English Version Safetydevicesforprotectionagainstexcessivepressure-Part 4:Pilot-operatedsafetyvalves(lSO4126-4:2013) Dispositifs de securite pour protection contre les pressions Sicherheitseinrichtungen gegen unzulassigen Uberdruck - excessives -Partie 4: Soupapes de surete pilotees (ISO Teil 4: Pilotgesteuerte Sicherheitsventile (ISO 4126-4:2013) 4126-4:2013) This European Standard was approved 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 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 status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary,Iceland, Ireland, Italy, Latvia, Lithuania Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom. cen EUROPEAN COMMITTEE FOR STANDARDIZATION COMITE EUROPEEN DE NORMALISATION EUROPAISCHES KOMITEEFUR NORMUNG Management Centre:Avenue Marnix 17,B-1000 Brussels @2013CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 4126-4:2013: E worldwide for CEN national Members. BSENISO4126-4:2013 ENISO 4126-4:2013 (E) Foreword This document (EN ISO 4126-4:2013) has been prepared by Technical Committee 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 text 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 responsible for identifying any or all such patent rights. ThisdocumentsupersedesENISO4126-4:2004. This document has been prepared under a mandate given to CEN by the European Commission and the For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. According to the CEN-CENELEC