1、BRITISH STANDARDBS EN 13433:2006Devices to prevent pollution by backflow of potable water Mechanical disconnector, direct actuated Family G, type AThe European Standard EN 13433:2006 has the status of a British StandardICS 13.060.20; 23.060.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37
2、g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 13433:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580
3、 54010 3National forewordThis British Standard was published by BSI. It is the UK implementation of EN 13433:2006.The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/4, Backflow prevention.A list of organizations represented on this
4、 committee can be obtained on request to its secretary.BSI, as a member of CEN, is obliged to publish EN 13433 as a British Standard. However, attention is drawn to the fact that during the development of this European Standard, the UK voted against its approval as a European Standard.The UK committ
5、ee believes that there are errors in the test procedure described in clause 9.5.3.2, Test 3. The required flow rate at stage 1 is adjusted by means of valve 6 which, in the opinion of the UK, should remain open throughout the procedure (along with Valve 4) to maintain the flow rate. When applying th
6、is standard, users are advised to treat test results from this procedure with caution.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 cannot confer immunity from legal obliga
7、tions. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13433March 2006ICS 13.060.20; 23.060.50English VersionDevices to prevent pollution by backflow of potable water -Mechanical disconnector, direct actuated - Family G, type ADispositifs de
8、 protection contre la pollution par retour deleau potable - Disconnecteur mcanique action directe -Famille G, type ASicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen - Rohrtrenner,nicht durchflussgesteuert - Familie G, Typ AThis European Standard was approved by
9、CEN on 16 December 2005.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandard
10、s 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 translationunder the responsibility of a CEN member into its own language and notified to the C
11、entral Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Po
12、land, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by an
13、y means reservedworldwide for CEN national Members.Ref. No. EN 13433:2006: EEN 13433:2006 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Terms and definitions.6 4 Nominal size7 5 Designation .8 6 Symbolization8 7 Physico-chemical characteristics8 7.1 Materials 8
14、7.2 Nature of the materials .9 8 Design9 8.1 General 9 8.2 Relief valve 9 8.3 Disconnection distance10 9 Characteristics and tests10 9.1 General 10 9.2 General tolerances10 9.3 Expression of the results .11 9.4 Dimensional characteristics.11 9.5 Mechanical characteristics.12 9.6 Leaktightness charac
15、teristics15 9.7 Hydraulic characteristics18 10 Order of testing .23 11 Marking and technical documents.23 11.1 General 23 11.2 Marking 23 11.3 Technical documents .24 12 Presentation at delivery25 Annex A (informative) Examples of presentation of test results 26 Bibliography.28 EN 13433:2006 (E) 3 F
16、oreword This European Standard (EN 13433:2006) has been prepared by Technical Committee CEN/TC 164 “Water supply”, 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
17、latest by September 2006, and conflicting national standards shall be with-drawn at the latest by September 2006. 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
18、, Czech Republic, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzer-land and United Kingdom. EN 13433:2006 (E) 4 Introduction In resp
19、ect of potential adverse effects on the quality of water intended for human consumption, caused by the product covered by this European Standard: 1) this European Standard provides no information as to whether the product may be used without re-striction in any of the Member state of the EU or EFTA;
20、 2) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. EN 13433:2006 (E) 5 1 Scope This European Standard specifies, the dimensional, the physico-chemical,
21、the design, the hydraulic, the mechanical and the acoustic characteristics of mechanical disconnector, direct actuated Family G, type A. This European Standard is applicable to mechanical disconnector direct actuated in nominal sizes DN 8 up to DN 250, intended to prevent the return of water having
22、lost its original sanitary and drinking qualities (called “polluted water“ in this European Standard), into the potable water distribution system whenever the pressure of the latter is temporarily lower than in the polluted circuit. This European Standard covers the mechanical disconnector direct ac
23、tuated of PN 10 that are capable of working without modification or adjustment: at any pressure up to 1 MPa (10 bar); with any pressure variation up to 1 MPa (10 bar); in permanent duty at a limit temperature of 65 C and 90 C for 1 h maximum. It specifies also the test methods and requirements for v
24、erifying these characteristics, the marking and the presentation at delivery. 2 Normative references The following referenced documents are indispensable for the application of this European Standard. For da-ted references, only the edition cited applies. For undated references, the latest edition o
25、f the referenced do-cument (including any amendments) applies. EN 806-1:2000, Specifications for installations inside buildings conveying water for human consumption Part 1: General EN 1092-1, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN desig-nated Part
26、1: Steel flanges EN 1092-2, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PN desig-nated Part 2: Cast iron flanges EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by b
27、ackflow EN 13959, Anti-pollution check valves DN 6 to DN 250 inclusive family E, type A, B, C and D EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dimensions, tolerances and designation (ISO 228-1:2000) EN ISO 3822-1, Acoustics Laboratory tests on noise em
28、ission from appliances and equipment used in wa-ter supply installations Part 1: Method of measurement (ISO 3822-1:1999) EN ISO 3822-3:1997, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 3: Mounting and operating conditions for in-
29、line valves and appliances (ISO 3822-3:1984) EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running full Part 1: General principles and requirements (ISO 5167-1:2003) EN 13433:2006 (E) 6 EN ISO 6509, Corrosion of metals
30、and alloys Determination of dezincification resistance of brass (ISO 6509:1981) ISO 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests 3 Terms and definitions For th
31、e purposes of this European Standard, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following apply. 3.1 mechanical disconnector, hydraulic actuated Family G, type A specific characteristics of this device called “GA”, (see Figure 1) are as follows: two pressure zones in flo
32、w position: upstream and downstream; three zones in drain position (zero-flow): upstream, intermediate and downstream. The upstream spring loaded obturator with discharge system and the downstream check valve separate the intermediate zone from the upstream and downstream zone; flow position is achi
33、eved at a pressure pf ps+ 50 kPa (0,5 bar); the relief valve starts opening at the set pressure ps pstat+ 50 kPa (0,5 bar); drain position is achieved at a pressure p0 ps- 36 kPa (0,36 bar); a determined relief flow rate; a drain position visible directly or by a position indicator Figure 1 Design p
34、rinciple 3.2 inlet pressure, p1pressure on the inlet side of the device EN 13433:2006 (E) 7 3.3 intermediate pressure, pipressure in the intermediate chamber of the device (in drain position pi= patmosph.and under flow condition pi= p1) 3.4 outlet pressure, p2pressure on the outlet side of the devic
35、e 3.5 differential pressure p differential pressure between the inlet pressure p1and the outlet pressure p2 3.6 static pressure pstatpressure equivalent to the height of the water column between the highest draw-off point and the horizontal axis of the installed disconnector 3.7 set pressure ps pres
36、sure at which the relief valve starts to open 3.8 opening pressure popressure at which the disconnection distance of 20 mm is reaches 3.9 closing pressure pfpressure at which the relief valve is fully closed 3.10 disconnection distance minimal distance between the seat of the relief valve and the se
37、at of the upstream obturator where the dis-connection is operated NOTE For the purposes of this standard Mechanical disconnector, direct actuated Family G, type A is hereafter referred to as device. 4 Nominal size The nominal size of the device is given in Table 1: Table 1 DN versus threads and flan
38、ges Nominal size DN 8 10 15 20 25 32 40 50 65 80 100 125 150 200 250Threads (designation in accordance with ISO 7-1) G G G G G 1 G 1 G 1 G 2 Flanges (DN) 40 50 65 80 100 125 150 200 250EN 13433:2006 (E) 8 5 Designation A mechanical disconnector direct actuated Family G, Type A is designated by: name
39、; reference to this European Standard, i.e. EN 13433; family and type nominal size (see Table 1); connection type; material of its body; surface finish (possible coatings); acoustic group (if applicable). EXAMPLE of designation Mechanical disconnector EN 13433, direct actuated Family G, Type A, DN 3
40、2, G 1 G 1, cast iron, epoxy coated, I. 6 Symbolization The graphic representation of the mechanical disconnector direct actuated Family G, Type A is as follows (see Figure 2): Figure 2 Graphic symbol 7 Physico-chemical characteristics 7.1 Materials The materials and the coatings used, liable to com
41、e normally or accidentally in contact with potable water, shall satisfy the EU regulations concerning water quality. The materials and the coatings shall be: a) corrosion resistant; b) prone to the least scaling possible; c) in conformity with the European Standards and regulations; EN 13433:2006 (E
42、) 9 d) compatible among themselves and: 1) with the water supply; 2) with the fluids or matter liable to come into contact with them; 3) with the products normally used for disinfection of the water distribution system: potassium perman-ganate and sodium hypochlorite. 7.2 Nature of the materials a)
43、The choice of materials is left to the discretion of the manufacturer. Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to water capable of dezincification. In the countries where the use of products made of dezincification resistant materials is requir
44、ed, the products have to guarantee a dezincification depth less than 200 m in any direction, they have to be tested in accordance with EN ISO 6509 and have to be marked in compliance with the indications in Clause 11; NOTE This European Standard does not cover non-metallic materials for bodies. b) n
45、either the materials nor the coatings used shall, by normal or accidental contact with drinking water, cause any risk of affecting or modifying the water up to a temperature of 90 C. The suitability of the water for human consumption is defined by national regulations; c) the manufacturer shall stat
46、e in his technical and sales literature the nature of the materials and the coat-ings selected; d) the materials, and in particular copper alloys, for which recommendations or International Standard exists shall comply with the relevant recommendations or International Standards. 8 Design 8.1 Genera
47、l a) The internal components of the device shall be accessible for inspection, repair or replacement. By de-sign, the components shall be able to be refitted at their initial place, without ambiguity (impossibility of reversal, interchange of obturators, diaphragms, springs). A visible mark is not s
48、ufficient. b) Additional control devices (electrical, pneumatic etc.) shall not influence the safety function. c) The settings of the springs shall be fixed and not adjustable. d) The device shall comprise one pressure tapping and a visible indication on the device when the obturator is in the drain
49、 position. The pressure tapping is located on the inlet of the device. e) Only the pressure of the water of the supply system at the inlet can operate the control of the internal components of the device. 8.2 Relief valve Under normal service conditions p1 psthe relief valve is closed. At an inlet pressure p1 psthe relief valve starts opening and at a pressure p1 pothe relief valve is in drain position. There shall be a visible indication on the device, when the obtu
