阀门标准-BS EN 736-3-1999 Valves — Terminology — Part 3 Definition of terms(天选打工人).pdf

BRITISH STANDARDBS EN 736-3:1999Incorporating Amendment No.1Valves Terminology Part 3:Definition of termsThe European Standard EN 736-3:1999,with the incorporation of amendment A1:2001,has the status of a British StandardICS 01.040.23;23.060.01?Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-BS EN 736-3:1999This British Standard,having been prepared under the direction of the Engineering Sector Committee,was published under the authority of the Standards Committee and comes into effect on 15 August 1999 BSI 24 October 2002ISBN 0 580 32676 4National forewordThis British Standard is the English language version of EN 736-3:1999,including amendment A1:2001.The UK participation in its preparation was entrusted by Technical Committee PSE/7,Valves,to Subcommittee PSE/7/1,Valves Basic standards,which has the responsibility to:A list of organizations represented on this subcommittee can be obtained on request to its secretary.Cross-referencesThe 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“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 legal obligations.aid enquirers to understand the text;present to the responsible 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.Summary of pagesThis document comprises a front cover,an inside front cover,the EN title page,pages 2 to 8,an inside back cover and a back cover.The BSI copyright notice displayed throughout the document indicates when the document was last issued.Amendments issued since publicationAmd.No.DateComments1409424 October 2002Changes to 3.3.7Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 736-3May 1999+A1September 2001ICS 01.040.23;23.060.01English versionValves Terminology Part 3:Definition of terms(including amendment A1:2001)Appareils de robinetterie Terminologie Partie 3:Definition des termes(inclut lamendement A1:2001)Armaturen Terminologie Teil 3:Definition von Begriffen(enthlt nderung A1:2001)This European Standard was approved by CEN on 16 April 1999.AmendmentA1 was approved by CEN on 22 June 2001.CEN members are bound to comply with the CEN/CENELEC InternalRegulations which stipulate the conditions for giving this European Standardthe status of a national standard without any alteration.Up-to-date lists andbibliographical references concerning such national standards may be obtainedon application to the Central Secretariat 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 theresponsibility of a CEN member into its own language and notified to theCentral Secretariat has the same status as the official versions.CEN members are the national standards bodies of Austria,Belgium,CzechRepublic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland andUnited Kingdom.CENEuropean Committee for StandardizationComit Europen de NormalisationEuropisches Komitee fr NormungCentral Secretariat:rue de Stassart 36,B-1050 Brussels 1999 CEN All rights of reproduction in any form and by any means reserved worldwide for CEN national Members.Ref.No.EN 736-3:1999+A1:2001 ECopyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-EN 736-3:1999 BSI 24 October 20022Foreword This European Standard 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 November 1999,and conflicting national standards shall be withdrawn at the latest by November 1999.This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association.This European Standard is considered to be a supporting standard to those applications and product standards which in themselves support an essential safety requirement of a New Approach Directive and which make reference to this European Standard.According to the CEN/CENELEC Internal Regulations,the national standards organizations of the following countries are bound to implement this European Standard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland and the United Kingdom.Foreword to amendment A1This amendment EN 736-3:1999/A1:2001 to the EN 736-3:1999 has been prepared by Technical Committee CEN/TC 69,Industrial valves,the Secretariat of which is held by AFNOR.This amendment to the European Standard EN 736-3:1999 shall be given the status of a national standard,either by publication of an identical text or by endorsement,at the latest by March 2002,and conflicting national standards shall be withdrawn at the latest by March 2002.This European Standard has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association.This European Standard is considered to be a supporting standard to those application and product standards which in themselves support an essential safety requirement of a New Approach Directive and which make reference to this European Standard.According to the CEN/CENELEC Internal Regulations,the national standards organizations of the following countries are bound to implement this European Standard:Austria,Belgium,Czech Republic,Denmark,Finland,France,Germany,Greece,Iceland,Ireland,Italy,Luxembourg,Netherlands,Norway,Portugal,Spain,Sweden,Switzerland and the United Kingdom.ContentsForeword2Introduction31Scope32Normative references33Definitions33.1Terms relating to pressure and temperature33.2Terms relating to dimensions43.3Terms relating to design53.4Terms relating to flow characteristics63.5Terms relating to operation63.6Terms relating to tests7Annex A(informative)Glossary8Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-w w w.b z f x w.c o mEN 736-3:1999 BSI 24 October 20023IntroductionPart 3 is the first step in harmonizing the definitions of terms for valves.Part 1 deals with the definitionsof types of valves and part 2 with definitions of components.It is possible that other terms and their definitions will be found in other European Standards.Experts writing European Standards are asked to use the terms and definitions given in this standard.Ifother terms and definitions are necessary or are published in other European Standards,please inform theSecretariat of CEN/TC 69 so that the terms and definitions in these European Standards can be includedor harmonized.1 ScopeThis standard defines the terms and their definitions(or the source if defined in other standards)necessary for describing pressure and temperature,dimensions,design,flow characteristics,operation and tests for valves.It aims to provide a uniform terminology for all types of valves.The terms and definitions in this standard may also apply to products other than valves,in which case it may be necessary to apply these definitions analogously.This standard covers terms common to more than one type of valve.The terms and definitions specific to one type of valve are found in the relevant product standard.2 Normative referencesThis European Standard incorporates,by dated or undated reference,provisions from other publications.These normative references are cited at the appropriate places in the text and the publications are listed hereafter.For dated references,subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision.For undated references the latest edition of the publication referred to applies.EN 558-1,Industrial valves Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems Part 1:PN.designated valves.EN 558-2,Industrial valves Face-to-face and centre-to-face dimensions of metal valves for use in flanged pipe systems Part 2:Class-designated valves.EN 764,Pressure equipment Terminology and symbols Pressure,temperature,volume.EN 1333,Pipework components Definition and selection of PN.prEN 1759-3,Flanges and their joints Circular flanges for pipes,valves,fittings and accessories,class designated Part 3:Copper alloy and composite flanges.EN ISO 6708,Pipework components Definition and selection of DN(nominal size).(ISO 6708:1995)EN 60534-1,Industrial-process control valves Part 1:Control valve terminology and general considerations.(IEC 60534-1:1987)3 DefinitionsFor the purposes of this standard,the following definitions apply.3.1 Terms relating to pressure and temperature3.1.1 allowable pressure,psEN 7643.1.2 test pressure,pt EN 764Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-w w w.b z f x w.c o mEN 736-3:19994 BSI 24 October 20023.1.3 allowable temperature,ts EN 7643.1.4 test temperature,tt EN 7643.1.5 PNEN 13333.1.6 classprEN 1759-33.1.7 allowable differential pressure maximum allowable static differential pressure at a given temperature of a valve when it is in the closed position3.2 Terms relating to dimensions3.2.1 DN(nominal size)EN ISO 67083.2.2 NPSprEN 1759-33.2.3 face-to-face dimension,FTFEN 558-1 and EN 558-23.2.4 centre-to-face dimension,CTFEN 558-1 and EN 558-23.2.5 end-to-end dimension,ETE distance expressed in millimetres between the ends of the body for straight pattern valves other than those with flanged ends3.2.6 centre-to-end dimension,CTE distance expressed in millimetres between one of the ends of the body and the centre of the body for angle pattern valves other than those with flanged ends3.2.7 travelEN 60534-13.2.8 relative travel,hEN 60534-13.2.9 rated travelEN 60534-1Copyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-w w w.b z f x w.c o mEN 736-3:1999 BSI 24 October 200253.2.10 maximum travel for valves with mechanical end stops,the total displacement of the obturator between these mechanical end stopsNOTE 1The mechanical end stops may be in the body,the bonnet or cover,the operating device,etc.3.3 Terms relating to design3.3.1 full bore valve valve with the seat diameter not less than 90%of the nominal inside diameter of the body end portNOTEThe nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.2 clearway valve valve designed to have an unobstructed flow way which allows the passage of a theoretical sphere with a diameter which is not less than the nominal inside diameter of the body end port NOTEThe nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.3 reduced bore valve valve with a seat diameter less than 90%and not less than 60%of the nominal inside diameter of the body end portNOTEThe nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.4 symmetric valve valve with an internal construction which has a plane of symmetry perpendicular to the axis of the body ends3.3.5 asymmetric valve valve with an internal construction which has no plane of symmetry perpendicular to the axis of the body ends3.3.6 anti-static design valve design which ensures electrical continuity between all the components in contact with the fluid and the shell3.3.7 anti-blow out design valve design which ensures that the shaft or stem cannot be blown out of the shell when the valve is under pressure:by disassembly of any external part;or by failure of the connection between obturator and shaft or stem even when external parts are removed.NOTEExternal parts are parts which are not included in the bare shaft valve(bracket,lever,actuator.).3.3.8 coating protective layer applied to a valve component or the valve itself to provide a protection against corrosion and/or to prevent contamination of the fluid by the valveCopyright British Standards Institution Reproduced by IHS under license with BSI-Uncontrolled Copy Document provided by IHS Licensee=Bureau Veritas/5959906001,11/08/200405:35:15 MST Questions or comments about this message:please call the DocumentPolicy Group at 303-397-2295.-,-,-w w w.b z f x w.c o mEN 736-3:19996 BSI 24 October 20023.4 Terms relating to flow characteristics3.4.1 flow coefficient,Kv,(Cv)EN 60534-13.4.2 rated flow coefficientEN 60534-13.4.3 relative flow coefficient,?EN 60534-13.4.4 inherent flow characteristicEN 60534-13.4.5 flow resistance coefficient,?dimensionless,is a specific differential pressure across the valve.The value of?can be obtained from test results by using the following equation:3.4.6 cavitation two stage process associated with the flow of liquids.The first phase involves the formation of vapour bubbles in the fluid stream further to the dropping of the static pressure to below the saturation vapour pressure of the liquid.The second phase of the process is the implosion of these vapour bubbles which recondense into the liquid state when the static pressure rises above the sat