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、g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 13434:2006This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 July 2007 BSI 2007ISBN 978 0
3、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 supply, to Subcommittee B/504/4, Backflow prevention.A list of organizations represented on t
4、his 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 this European Standard, the UK voted against its approval as a European Standard.The UK comm
5、ittee 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. The UK commit
6、tee 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 publication does not purport to include all the necessary provisions of a contract. Users are respons
7、ible for its correct application.Compliance with a British Standard cannot confer immunity from legal obligations. Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 13434March 2006ICS 13.060.20; 23.060.50English VersionDevices to prevent pollu
8、tion by backflow of potable water -Mechanical disconnector, hydraulic actuated - Family G, type BDispositifs de protection contre la pollution par retour deleau potable - Disconnecteur mcanique assisthydrauliquement - Famille G, type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmu
9、tzung durch Rckflieen - Rohrtrenner,durchflussgesteuert - Familie G, Typ BThis European Standard was approved by 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
10、standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards 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
11、 language made by translationunder the responsibility of a CEN member into its own language and notified to the Central 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
12、,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania,Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUN
13、GManagement Centre: rue de Stassart, 36 B-1050 Brussels 2006 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13434:2006: EEN 13434:2006 (E) 2 Contents Page Foreword 3 Introduction4 1 Scope .5 2 Normative references .5 3 Terms and def
14、initions.6 4 Nominal size7 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
15、 of the results .11 9.4 Dimensional 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 d
16、elivery25 Annex A (informative) Examples of presentation of test results 26 Bibliography.28 EN 13434:2006 (E) 3 Foreword This European Standard (EN 13434:2006) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held by AFNOR. This European Standard shall
17、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 to the CEN/CENELEC Internal Regulations, the national standards
18、 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, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Roma
19、nia, Slovakia, Slovenia, Spain, Sweden, Switzer-land and United Kingdom. EN 13434:2006 (E) 4 Introduction In respect 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 inf
20、ormation 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, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remai
21、n in force. EN 13434:2006 (E) 5 1 Scope This European 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 mechani
22、cal disconnectors hydraulic actuated in nominal sizes 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 latte
23、r is temporarily lower than in the polluted circuit. This 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 perma
24、nent duty at a limit temperature of 65 C and 90 C for 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
25、 this European Standard. For da-ted references, only the 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: Ge
26、neral EN 1092-1, Flanges and their joints Circular flanges 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, Protec
27、tion against pollution of potable water in water installations 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 t
28、hreads Part 1: Dimensions, tolerances and designation (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
29、 emission from appliances and equipment used in water 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 runn
30、ing full Part 1: General principles and requirements (ISO 5167-1:2003) EN 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 on the threads Part 1: Dimensions, to
31、lerances 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 mechanical disconnector, hydraulic actuated Fa
32、mily 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 upstream spring loaded obturator with discha
33、rge 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 kPa (0,14 bar); flow position is achie
34、ved 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 defined in 9.7.4 without spilling to
35、 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 orifice of the device shall permit, nei
36、ther 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 intermediate zone. The dis-connection distanc
37、e 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 Performance tests shall be carried ou
38、t 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 specifications given in this European Stan
39、dard: EN 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; time: %100+ of the value specified. 9.2.2 Accuracy of measuring instruments Instruments for measuring temperature shall be accurate
40、 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. These results can be expressed as a curve. See Annex A for example. 9.4 Dimensional characteristics 9.4.1 Connections The connection
41、s 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 altering the pipework e.g. by means of a coupling nut or union. 9.4.2 Pressure tapping The device shall have a pressure tapping or
42、ifice 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-section area of 12,56 mm2. Their smallest dimension shall be 4 mm. Table 2 Dimension of thread and test parts DN Thread (designati
43、on in accordance with ISO 7-1) a mm 10 G 18 6,5 10 50 G 13 EN 13434:2006 (E) 12 Key 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
44、. 9.5 Mechanical characteristics 9.5.1 General Examples shown in the figures are 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
45、permanent deformation, nor rupture of the body or the internal parts of the device 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
46、); ensure that the device during the test is in flow position. This can be achieved 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 replacem
47、ent 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. EN 13434:2006 (E) 13 9.5.3.2 Procedures Test 1 Behaviour at t
48、emperature Place the complete device for 72 h in a drying oven at a temperature of 65 C with a relative humidity of (50 5) %. Test 2 Thermal shock Following the test 1, connect the device to a water supply with a temperature at 90 C maximum. When the temperature at the outlet of the device reaches 8
49、5 C, allow the flow to continue for 60 min and then supply the device with water at 15 C for 10 min. At the end oftests 1 and 2, verify that the device satisfies requirement b) of 9.5.3.1. Test 3 Mechanical endurance A Supply pressure: (1 0,05) MPa (10 0,5) bar B Supply pressure: (0,3 0,03) MPa (3 0,3) bar Key 1, 2, 3, 5 valve with time control of opening and closing 4, 6 adjusting valve Figure 4 Endurance testing equipment Following the preceding te
