1、BRITISH STANDARDBS EN 13434:2006Devices to prevent pollution by backflow of potable water Mechanical disconnector, hydraulic actuated Family G, type BThe European Standard EN 13434:2006 has the status of a British StandardICS 13.060.20; 23.060.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3
2、g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIBS EN 13434:2006This British Standard was published under the a
3、uthority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0 580 54009 7National forewordThis British Standard was published by BSI. It is the UK implementation of EN 13434:2006.The UK participation in its preparation was entrusted by Technical Committee B/504, Water su
4、pply, to Subcommittee B/504/4, Backflow prevention.A list of organizations represented on this committee can be obtained on request to its secretary.BSI, as a member of CEN, is obliged to publish EN 13434 as a British Standard. However, attention is drawn to the fact that during the development of t
5、his European Standard, the UK voted against its approval as a European Standard.The UK committee 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
6、open throughout the procedure (along with Valve 4) to maintain the flow rate. The UK committee believe this to be an error which will affect the remaining steps of the test sequence. When applying this standard, users are advised to treat test results from this procedure with caution.This publicatio
7、n 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 obligations. Amendments issued since publicationAmd. No. Date CommentsLicensed Copy: Wang Bin, na, Thu Sep
8、20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13434March 2006ICS 13.060.20; 23.060.50English VersionDevices to prevent pollution by backflow of potable water -Mechanical disconnector, hydraulic actuated - Family G, type BDispositifs de protec
9、tion contre la pollution par retour deleau potable - Disconnecteur mcanique assisthydrauliquement - Famille G, type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen - Rohrtrenner,durchflussgesteuert - Familie G, Typ BThis European Standard was approved by CEN o
10、n 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 nationalstandards may
11、 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 Centra
12、l 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, Poland,
13、 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 any mea
14、ns reservedworldwide for CEN national Members.Ref. No. EN 13434:2006: ELicensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Terms and definitions.6 4 Nominal size7
15、5 Designation .8 6 Symbolization8 7 Physico-chemical characteristics8 7.1 Materials 8 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 Dim
16、ensional characteristics.11 9.5 Mechanical characteristics.12 9.6 Leaktightness characteristics15 9.7 Hydraulic characteristics18 10 Order of testing .23 11 Marking and technical documents.24 11.1 General 24 11.2 Marking 24 11.3 Technical documents .24 12 Presentation at delivery25 Annex A (informat
17、ive) Examples of presentation of test results 26 Bibliography.28 Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 3 Foreword This European Standard (EN 13434:2006) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secr
18、etariat 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 September 2006, and conflicting national standards shall be with-drawn at the latest by September 2006. According
19、 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, Den-mark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
20、 Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzer-land and United Kingdom. Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 4 Introduction In respect of potential adverse effects
21、 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; 2) it should be noted that, whi
22、le awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force. Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 5 1 Scope This European
23、Standard specifies, the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteristics of mechanical disconnector, hydraulic actuated Family G, type B. This European Standard is applicable to mechanical disconnectors hydraulic actuated in nominal sizes
24、DN 8 up to DN 250, intended to prevent the return of water having 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. T
25、his European Standard covers the mechanical disconnectors hydraulic actuated 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
26、1 h maximum. It specifies also the test methods and requirements for verifying 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 t
27、he edition cited applies. For undated references, the latest edition of 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 fla
28、nges for pipes, valves, fittings and accessories, PN desig-nated Part 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 insta
29、llations and general requirements of devices to prevent pollution by backflow 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
30、(ISO 228-1:2000) EN ISO 3822-1, Acoustics Laboratory tests on noise emission 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
31、supply installations Part 3: Mounting and operating conditions for in-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 (
32、ISO 5167-1:2003) Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 6 EN ISO 6509, Corrosion of metals and alloys Determination of dezincification resistance of brass (ISO 6509:1981) ISO 7-1, Pipe threads where pressure-tight joints are made
33、on the threads Part 1: Dimensions, tolerances and designation ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests 3 Terms and definitions For the purposes of this European Standard, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following apply. 3.1 mechanica
34、l disconnector, hydraulic actuated Family G, type B specific characteristics of this device called “GB”, (see Figure 1) are as follows: two pressure zones in flow position: upstream and downstream; three pressure zones in drain position (zero-flow): upstream, intermediate and downstream. The upstrea
35、m spring loaded obturator with discharge system and the downstream check valve separate the intermediate zone from the upstream and downstream zone; at zero flow the disconnector is in drain position; the relief valve start opening at a pressure difference between upstream and downstream zone p 14 k
36、Pa (0,14 bar); flow position is achieved at a pressure difference p 2 mm). An air break to drain shall exist between any waste drain and any means of collecting the discharged water (floor, tundish, curb, sink). The device with an air break to drain fitted shall evacuate the full relief flow rate as
37、 defined in 9.7.4 without spilling to the outside. The air break to drain shall meet the dimensional requirements as specified in EN 1717. This air break to drain shall be: either directly incorporated into the device; or factory fitted; or supplied with the device. In the latter case, the relief or
38、ifice of the device shall permit, neither the fitting of a standardized threaded pipe, nor the connection of a standardized pipe or shape, be it by adhesive, welding or interlocking. 8.3 Disconnection distance In drain position the obturator shall close the opening from upstream zone to the intermed
39、iate zone. The dis-connection distance shall be at least 20 mm. The drain port shall be closed, before flow condition is achieved. The passage orifice of the drain port shall be at least equal to the minimum cross-section of the outlet water way (downstream). 9 Characteristics and tests 9.1 General
40、Performance tests shall be carried out on the device as installed in accordance with the manufacturers tech-nical documents. If not specified all tests shall be performed with water at an ambient temperature. 9.2 General tolerances 9.2.1 Tolerance on set values In the absence of any particular speci
41、fications given in this European Standard: Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 11 flow rate and pressure: 2 % of the value specified; temperature: cold water 5 C of the value specified; hot water 2 C of the value specified; tim
42、e: %100+ of the value specified. 9.2.2 Accuracy of measuring instruments Instruments for measuring temperature shall be accurate to 1 C. All other measuring instruments shall have an error limit of 2 % of the measured value. 9.3 Expression of the results The measured values shall be registered. Thes
43、e results can be expressed as a curve. See Annex A for example. 9.4 Dimensional characteristics 9.4.1 Connections The connections shall be in conformity with the following standards: EN ISO 228-1; ISO 7-1; EN 1092-1; EN 1092-2. Devices with threaded connections shall be capable of removal without al
44、tering the pipework e.g. by means of a coupling nut or union. 9.4.2 Pressure tapping The device shall have a pressure tapping orifice in the upstream zone according to the indications as shown in Figure 3 and Table 2. The bores for pressure tapping shall have over their full depth a minimum cross-se
45、ction area of 12,56 mm2. Their smallest dimension shall be 4 mm. Table 2 Dimension of thread and test parts DN Thread (designation in accordance with ISO 7-1) a mm 10 G 18 6,5 10 50 G 13 Licensed Copy: Wang Bin, na, Thu Sep 20 00:53:49 GMT+00:00 2007, Uncontrolled Copy, (c) BSIEN 13434:2006 (E) 12 K
46、ey G thread a test part Figure 3 Pressure tapping orifice These pressure tappings shall be fitted with test cocks: DN 6 (G connection) female outlet for devices DN 10; DN 8 (G connection) female outlet for devices 10 50. 9.5 Mechanical characteristics 9.5.1 General Examples shown in the figures are
47、for guidance only. Laboratory equipment shall be designed to ensure that the device can be tested in accordance with the requirement. 9.5.2 Mechanical resistance of the body under pressure 9.5.2.1 Requirement No visual permanent deformation, nor rupture of the body or the internal parts of the devic
48、e shall occur. 9.5.2.2 Procedure Apply at the inlet of the device in increments of 0,1 MPa (1 bar) per 5 s an increase of the static water pres-sure equal to 2,5 times the PN rating, the value that equal 2,5 MPa (25 bar); ensure that the device during the test is in flow position. This can be achiev
49、ed by a certain flow rate. Hold this pressure for 5 min. Observe the device and note any observations. Verify that the device satisfies the requirement of 9.5.2.1. 9.5.3 Endurance 9.5.3.1 Requirement a) Without replacement of any component, the device shall be capable of meeting the remaining require-ments of Clause 10; b) the device shall be disassembled, examined and any anomaly of the coating, elastomer parts and syn-thetic materials, shall be noted. Licensed Copy: Wan
