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british standard bs en736-3:1999incorporatingamendment 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 institutionreproduced by ihs under license with bsi - uncontrolled copydocument 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 736-3:1999national 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: 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.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.this 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 on15 august 1999 bsi 24 october 2002isbn 0 580 32676 4summary 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.amd. no.datecomments1409424 october 2002changes to 3.3.7amendments issued since publicationeuropean standard norme europenne europische normen 736-3may 1999+ a1september 2001ics 01.040.23; 23.060.01english version-,-,-valves 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 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 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 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 standards bodies of austria, belgium, czech republic, denmark, finland, france, germany, greece, iceland, ireland, italy, luxembourg, netherlands, norway, portugal, spain, sweden, switzerland and united kingdom.ceneuropean committee for standardization comit europen de normalisation europisches 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 forcen national members.ref. no. en 736-3:1999 + a1:2001 een 736-3:1999reproduced by ihs under license with bsi - uncontrolled copy05:35:15 mst questions or comments about this message: please call the documentpolicy group at 303-397-2295.forewordthis 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 thelatest 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 thelatest 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 pressureand temperature33.2terms relating to dimensions43.3terms relating to design53.4terms relating to flow characteristics63.5terms relating to operation63.6terms relating to tests 7annex a (informative) glossary82 bsi 24 ocopyright british standards institutiondocument provided by ihs licensee=bureau veritas/5959906001, 11/08/2004ctober 2002en 736-3:1999introductionpart 3 is the first step in harmonizing the definitions of terms for valves. part 1 deals with the definitions of 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. if other terms and definitions are necessary or are published in other european standards, please inform the secretariat of cen/tc 69 so that the terms and definitions in these european standards can be included or 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 generalconsiderations. (iec 60534-1:1987)3 definitionsfor the purposes of this standard, the following definitions apply.3.1terms relating to pressure and temperature3.1.1allowable pressure, psen 7643.1.2test pressure, pten 764 bscopyright british standards institution i 24 october 20023document provided by ihs licensee=bureau veritas/5959906001, 11/08/2004en 736-3:19993.1.3-,-,-allowable temperature, tsen 7643.1.4test temperature, tten 7643.1.5pnen 13333.1.6 classpren 1759-33.1.7allowable differential pressuremaximum allowable static differential pressure at a given temperature of a valve when it is in the closed position3.2terms relating to dimensions3.2.1dn (nominal size)en iso 67083.2.2npspren 1759-33.2.3face-to-face dimension, ftfen 558-1 and en 558-23.2.4centre-to-face dimension, ctfen 558-1 and en 558-23.2.5end-to-end dimension, etedistance expressed in millimetres between the ends of the body for straight pattern valves other than those with flanged ends3.2.6centre-to-end dimension, ctedistance 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 60534-13.2.8relative travel, hen 60534-13.2.9rated travelen 60534-14 bsi 24 ocopyright british standards institutiondocument provided by ihs licensee=bureau veritas/5959906001, 11/08/2004ctober 2002en 736-3:19993.2.10maximum travelfor valves with mechanical end stops, the total displacement of the obturator between these mechanical end stopsnote 1 the mechanical end stops may be in the body, the bonnet or cover, the operating device, etc.3.3terms relating to design3.3.1full bore valvevalve with the seat diameter not less than 90 % of the nominal inside diameter of the body end portnote the nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.2clearway valvevalve 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 portnote the nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.3reduced bore valvevalve with a seat diameter less than 90 % and not less than 60 % of the nominal inside diameter of the body end portnote the nominal inside diameter of the body end port for the particular valve type is specified in the corresponding product or performance standard.3.3.4symmetric valvevalve with an internal construction which has a plane of symmetry perpendicular to the axis of the body ends3.3.5asymmetric valvevalve with an internal construction which has no plane of symmetry perpendicular to the axis of the body ends3.3.6anti-static designvalve design which ensures electrical continuity between all the components in contact with the fluid and the shell3.3.7anti-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.note external parts are parts which are not included in the bare shaft valve (bracket, lever, actuator .).3.3.8 coatingprotective 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 valve bscopyright british standards institution i 24 october 20025document provided by ihs licensee=bureau veritas/5959906001, 11/08/2004en 736-3:19993.4 terms relating to flow characteristics3.4.1flow coefficient, kv, (cv) en 60534-13.4.2rated flow coefficienten 60534-13.4.3relative flow coefficient, en 60534-13.4.4inherent flow characteristicen 60534-13.4.5flow 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: 2 p=where- u2 pis the measured static pressure drop across the valve, in pascals; is the density of the fluid, in kilograms per cubic metre;uis the mean flow velocity in metres per second.note if the flow resistance coefficient is related to the mean velocity calculated using the dn number of the valve in millimetres the flow resistance is designated dn.3.4.6 cavitationtwo 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 saturation vapour pressure of the liquid3.5 terms relating to operation3.5.1operating torquetorque applied to the operating device which is necessary to operate the valve against specified working conditions, between the open and closed positions3.5.2strength torquetorque applied to the operating mechanism or when fitted, the operating device, for which the valve has been designed to resist-,-,-6 bsi 24 ocopyright british standards institutiondocument provided by ihs licensee=bureau veritas/5959906001, 11/08/2004ctober 2002en 736-3:19993.6 terms relating to tests3.6.1type testtest carried out on one or more valves representative of the design and the manufacturing process to confirm conformance of the production with specified requirements3.6.2production testtest carried out on valves during the manufacturing process to confirm conformance of the production with the specified requirements3.6.3acceptance test-,-,-test carried out in accordance with the technical specifications of the order bscopyright british standards institution i 24 october 20027document provided by ihs licensee=bureau veritas/5959906001, 11/08/2004en 736-3:1999annex a (informative) glossaryenglishgerman frenchsubclauseacceptance testanerkennungsprfungessai de rception3.6.3allowable differential pressurezulssiger differenzdruckpression diffrentielle admissible3.1.7allowable pressurezulssiger druckpression admissible3.1.1 allowable temperaturezulssige temperaturtemprature admissible 3.1.3 anti-blow out designausblassichere ausfhrungconception anti-jection3.3.7anti-static designantistatikausfhrungconcept
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