BS-EN-ISO-4126-4-2004.pdf
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1、BRITISH STANDARD BS EN ISO 4126-4:2004 Safety devices for protection against excessive pressure Part 4: Pilot operated safety valves The European Standard EN ISO 4126-4:2004 has the status of a British Standard ICS 13.240 ? BS EN ISO 4126-4:2004 This British Standard was published under the authorit
2、y of the Standards Policy and Strategy Committee on 8 April 2004 BSI 8 April 2004 ISBN 0 580 43647 0 National foreword This British Standard is the official English language version of EN ISO 4126-4:2004. It is identical with ISO 4126-4:2004. BS EN ISO 4126-4:2004 together with Parts 1 to 3 and 5 to
3、 7 of the series when published, supersedes BS 2915:1990, which will be withdrawn upon publication of all seven parts. The UK participation in its preparation was entrusted to Technical Committee PVE/12, Safety Devices, which has the responsibility to: A list of organizations represented on this com
4、mittee can be obtained on request to its secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the
5、“Search” facility of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from leg
6、al obligations. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. S
7、ummary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 30, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No. DateCom
8、ments EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN ISO 4126-4 February 2004 ICS 13.240 English version Safety devices for protection against excessive pressure - Part 4: Pilot operated safety valves (ISO 4126-4:2004) Dispositifs de scurit pour protection contre les pressions excessives - Par
9、tie 4: Soupapes de sret pilotes (ISO 4126-4:2004) Sicherheitseinrichtungen gegen unzulssigen berdruck - Teil 4: Pilotgesteuerte Sicherheitsventile (ISO 4126-4:2004) This European Standard was approved by CEN on 16 May 2003. CEN members are bound to comply with the CEN/CENELEC Internal Regulations wh
10、ich 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 Central Secretariat or to any CEN member. This European St
11、andard 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 Central Secretariat has the same status as the official versions. CEN members are the national st
12、andards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EUROPEAN C
13、OMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Management Centre: rue de Stassart, 36 B-1050 Brussels 2004 CENAll rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN ISO 4126-4:2004: E EN ISO 4126-4:
14、2004 (E) 2 Contents Page 1Scope 4 2Normative references 4 3Terms and definitions4 4Symbols and units.9 5Design.9 5.1General9 5.2End connections10 5.3Minimum requirements for springs12 5.4Materials12 6Production testing .12 6.1Purpose.12 6.2General12 6.3Hydrostatic testing 12 6.4Pneumatic testing13 6
15、.5Adjustment of set or cold differential test pressure 14 6.6Seat leakage test14 6.7Pressure seals15 7Type testing15 7.1General15 7.2Tests to determine operating characteristics.16 7.3Tests to determine flow characteristics 18 7.4Determination of the coefficient of discharge 19 7.5Certification of c
16、oefficient of discharge19 8Determination of pilot operated safety valve performance.20 8.1Determination of coefficient of discharge.20 8.2Critical and subcritical flow20 8.3Discharge capacity at critical flow.20 8.4Discharge capacity for any gas at subcritical flow 21 8.5Discharge capacity for non-f
17、lashing liquid as the test medium in the turbulent zone where the Reynolds number Re is equal to or greater than 80 00021 9Sizing of pilot operated safety valves21 9.1General21 9.2Valves for gas or vapour relief .21 9.3Calculation of capacity22 10Marking and sealing 23 10.1Marking .23 10.2Sealing of
18、 a pilot operated safety valve 24 Annex A (informative) Examples of capacity calculations for various media 25 A.1Capacity calculations for gaseous media at critical flow (see 9.3.3.1) 25 A.2Capacity calculations for gaseous media at subcritical flow (see 9.3.3.2)27 A.3Capacity calculations for liqu
19、ids (see 9.3.4).28 Annex ZA (informative) Relationship between this European Standard and the Essential Requirements of EU Directive 97/23/EC (PED).30 EN ISO 4126-4:2004 (E) 3 Foreword This document (EN ISO 4126-4:2004) has been prepared by Technical Committee CEN/TC 69 “Industrial valves”, the secr
20、etariat of which is held by AFNOR, in collaboration with Technical Committee ISO/TC 185 “Safety devices for protection against excessive pressure”. 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
21、August 2004, and conflicting national standards shall be withdrawn at the latest by August 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. For relationship with
22、 EU Directive, 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, Cyprus, Czech Republic, Denmark, Es
23、tonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. This standard for safety devices for protection against excessive pressure consis
24、ts of seven parts of which this is Part 4. The various parts are: 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
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- BS EN ISO 4126 2004
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