1、BRITISH STANDARD BS EN 28233:1992 BS2782-11: Method1131: 1992 ISO8233:1988 Thermoplastics valves Torque Testmethod The European Standard EN28233:1990 has the status of a BritishStandard UDC 621.646-036.073:620.1:531.781BSEN28233:1992 This British Standard, having been prepared under the directionof
2、the Plastics and Rubber Standards Policy Committee, was published underthe authority of the Standards Board and comes intoeffect on 15 October1992 BSI 01-2000 The following BSI references relate to the work on this standard: Committee reference PRM/61 Announced in BSI News September1992 ISBN 0 580 2
3、1250 5 Cooperating organizations The European Committee for Standardization(CEN), under whose supervision this European Standard was prepared, comprises the national standards organizations of the following countries: Austria Oesterreichisches Normungsinstitut Belgium Institut belge de normalisation
4、 Denmark Dansk Standardiseringsraad Finland Suomen Standardisoimisliito, r.y. France Association franaise de normalisation Germany Deutsches Institut fr Normung e.V. Greece Hellenic Organization for Standardization Iceland Technological Institute of Iceland Ireland National Standards Authority of Ir
5、eland Italy Ente Nazionale Italiano di Unificazione Luxembourg Inspection du Travail et des Mines Netherlands Nederlands Normalisatie-instituut Norway Norges Standardiseringsforbund Portugal Instituto Portugus da Qualidade Spain Asociacin Espaola de Normalizacin y Certificacin Sweden Standardisering
6、skommissionen i Sverige Switzerland Association suisse de normalisation United Kingdom British Standards Institution Amendments issued since publication Amd. No. Date CommentsBSEN28233:1992 BSI 01-2000 i Contents Page Cooperating organizations Inside front cover National foreword ii Foreword 2 1 Sco
7、pe 3 2 Field of application 3 3 References 3 4 Definitions 3 5 Test specimen 3 6 Test conditions 3 7 Apparatus 3 8 Procedure 3 9 Test report 4 National annex NA (informative) Committees responsible Inside back cover Table 4BSEN28233:1992 ii BSI 01-2000 National foreword This BritishStandard has been
8、 prepared under the direction of the Plastics and Rubber Standards Policy Committee and is the English language version of EN28233:1990 Thermoplastics valves Torque Test method, published by the European Committee for Standardization(CEN). It is identical with ISO8233:1988, published by the Internat
9、ional Organization for Standardization(ISO). A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligatio
10、ns. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, theEN title page, pages2 to4, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendmen
11、t table on the inside front cover.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN28233 December1990 UDC 621.646-036.073:620.1:531.781 Descriptors: Plastics, thermoplastic resins, cocks, torque, tests, testing, conditions English version Thermoplastics valves Torque Test method (ISO8233:1988) Ro
12、binets en matriaux thermoplastiques Couple de manoeuvre Mthode dessai (ISO8233:1988) Armaturen aus Thermoplasten Drehmoment Prfmethode (ISO8233:1988) This European Standard was approved by CEN on1990-11-08. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the
13、 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
14、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
15、Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat
16、: rue de Stassart 36, B-1050 Brussels 1990 Copyright reserved to CEN members Ref.No.EN28233:1990EEN28233:1990 2 BSI 01-2000 Foreword Based on the positive result of the Formal Vote procedure, the International Standard ISO8233:1988 Thermoplastics valves Torque Test method is adopted as a European St
17、andard. In accordance with the Common CEN/CENELEC Rules, the following countries are bound to implement this standard: Austria, Belgium, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EN2823
18、3:1990 BSI 01-2000 3 1 Scope This International Standard specifies a test method for the determination of the opening and closing torque of thermoplastics valves. 2 Field of application This International Standard applies to all types of thermoplastics valves intended to be used for the transport of
19、 fluids. 3 References ISO161-1, Thermoplastics pipes for the transport of fluids Nominal outside diameters and nominal pressures Part1: Metric series. ISO6708, Pipe components Definition of nominal size. ISO7349, Thermoplastics valves Connection references. 4 Definitions For the purposes of this Int
20、ernational Standard, the definition of the nominal diameter(DN) given in ISO6708 and the following definitions apply. 4.1 closing torque torque exerted over the full closing operation to achieve full tightness of the valve at nominal pressure 4.2 opening torque torque exerted initially to open the v
21、alve from fully closed or over the full opening operation 4.3 nominal pressure(PN) alphanumeric designation, used for reference purposes, related to the mechanical strength of a valve. Usually it corresponds to the service pressure, in bar 1) , with water at20 C, for which the valve is designed(seeI
22、SO161-1) 5 Test specimen The test specimen shall be an unused valve, unless otherwise specified in the specific product standard. 6 Test conditions 6.1 Water or air at the nominal pressure of the valve(0,6MPamax. when using air), connected in accordance with ISO7349, at23 2 C shall be applied to the
23、 test specimen as indicated in clause8. 6.2 Other test conditions, including the use of other fluids and/or other temperatures, may also be prescribed by specifications for valves for particular applications, such as those for the transport of gaseous fuels. 7 Apparatus NOTEIf air is used as the tes
24、t medium, it is necessary to take appropriate safety precautions for the use of compressed gases. 7.1 Pump, capable of delivering a pressure at least equivalent to the nominal pressure of the valve under test. 7.2 Device, capable of supplying the required torque with an accuracy of 2%. 7.3 Measuring
25、 instrument, between the torque device and the valve, which shall permit the continuous reading of the torque with the required accuracy of 2%, and the recording of its maximum value. 8 Procedure 8.1 Torque test before conditioning At least12h before carrying out this test, open and close the valve
26、ten times to ensure smooth operation. 8.1.1 With the valve closed, raise the pressure gradually over60s to the nominal pressure of the valve and maintain it for5min. 8.1.2 Connect the valve handle to the torque device and measuring instrument and apply a torque, increasing it gradually until the ope
27、ning torque is reached. Complete the opening of the valve in accordance with the requirements specified in the Table. 8.1.3 Record the opening torque of the valve, if possible during the whole operation. 8.1.4 Close the valve to full tightness at nominal pressure and record the closing torque, if po
28、ssible during the whole operation. 8.1.5 The measured test results shall meet the test requirements in the relevant product standard. 8.2 Torque test after conditioning 8.2.1 Condition the test valve by maintaining it closed at the nominal internal pressure for the time required by the specific prod
29、uct standard. 8.2.2 Repeat the test described in8.1.1 to8.1.4. The valve shall also meet the requirements of8.1.5. 8.2.3 Bidirectional valves shall be tested according to this procedure in both directions. 1) 1bar=10 5 PaEN28233:1990 4 BSI 01-2000 Table 9 Test report A test report shall be provided
30、for every valve tested and shall contain the following information: a) reference to this International Standard and test designation(clause8); b) complete identification of the valve type: material of the valve body and seals, nominal size(DN), socket diameter(D 1 ) or spigot diameter(nominal outsid
31、e diameter) 2) , nominal pressure(PN) of the valve, manufacturers name or trade-mark, if necessary, flow direction; c) date of test; d) recorded values of the opening and closing torque, before and after conditioning. Type Nominal size a DN Operating time a,b s Operating speed r/min Quarter-turn val
32、ves DNu 50 DN 50 2 Multiple-turn valves DNu 50 DN50 . 20 . 10 a For valves for piping systems sized on the basis of e.g.ISO161-1, the value of the nominal outside diameter, expressed in millimetres, of the corresponding pipe is used in place of the value given for DN. b If calculated, the operating
33、time shall be rounded up to the nearest whole second. DN 30 - 2) In accordance with ISO161-1.BSEN28233:1992 BSI 01-2000 National annex NA (informative) Committees responsible The United Kingdom participation in the preparation of this European Standard was entrusted by the Plastics and Rubber Standa
34、rds Policy Committee(PRM/-) to Technical Committee PRM/61, upon which the following bodies were represented: British Board of Agrment British Gas plc British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve and Actuator Manufacturers Association Department of the
35、 Environment(Property Services Agency) Department of the Environment(Building Research Establishment) Department of the Environment(Construction Directorate) Department of Transport Electricity Association Engineering Equipment and Materials Users Association Federation of Civil Engineering Contract
36、ors Health and Safety Executive Institute of Building Control Institution of Civil Engineers Institution of Gas Engineers Institution of Water and Environmental Management National Association of Plumbing, Heating and Mechanical Services Contractors Pipeline Industries Guild Plastics and Rubber Inst
37、itute Plastics Land Drainage Manufacturers Association Royal Institute of Public Health and Hygiene Society of British Gas Industries Society of British Water Industries Water Companies Association Water Research Centre Water Services Association of England and WalesBS EN 28233:1992 BS2782-11: Metho
38、d1131: 1992 ISO8233:1988 BSI 389 Chiswick High Road London W4 4AL BSIBritishStandardsInstitution BSI is the independent national body responsible for preparing BritishStandards. It presents the UK view on standards in Europe and at the international level. It is incorporated by Royal Charter. Revisi
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