1、BRITISH STANDARDBS EN 14451:2005Incorporating corrigendum October 2008Devices to prevent pollution by backflow of potable water In-line anti-vacuum valves DN 8 to DN 80 Family D, type AICS 13.060.20; 23.060.50g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g5
2、0g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14451:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 21 December 2005 BSI 2008ISBN 978 0 580 63083 5National forewordThis
3、British Standard is the UK implementation of EN 14451:2005. It supersedes BS 6282-2:1982, BS 6282-3:1982 and BS 6282-4:1982 which are withdrawn. The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/14, Backflow prevention.A list of o
4、rganizations represented on this subcommittee can be obtained on request to its secretary.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 o
5、bligations.Amendments/corrigenda issued since publicationDate Comments3 20080 November Addition of supersession details to national forewordEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14451May 2005ICS 13.060.20; 23.060.50English versionDevices to prevent pollution by backflow of potable water
6、- In-line anti-vacuum valves DN 8 to DN 80 - Family D, type ADispositifs de protection contre la pollution de leau potablepar retour - Soupape anti-vide en ligne DN 8 DN 80 -Famille D, type ASicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen - Rohrbelfter DN8 bis
7、DN 80 - Familie D, Typ AThis European Standard was approved by CEN on 24 December 2004.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
8、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 language made by translationunder the responsibil
9、ity 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,Germany, Greece, Hungary, Iceland, Ireland, Italy
10、, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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 200
11、5 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14451:2005: EEN 14451:2005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Nominal size .6 5 Designation 6 6 Marking and
12、technical documents.6 7 Symbolization.8 8 General design characteristics 8 9 Physico-chemical characteristics9 10 Characteristics and tests 10 11 Acoustic characteristics .19 Annex A (normative) Sampling and test sequence21 BS EN 14451:2005EN 14451:2005 (E) 3 Foreword This document (EN 14451:2005) h
13、as 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 latest by November 2005, and conflicting nationa
14、l standards shall be withdrawn at the latest by November 2005. This document has been developed with reference to EN 1717 “Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow“. According to the CEN/CENELEC Internal
15、 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, Luxem-bourg, Malta, Netherl
16、ands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. BS EN 14451:2005EN 14451:2005 (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 document: a) this
17、document provides no information as to whether the product may be used without restriction in any of the Member States of the EU or EFTA; b) it should be noted that, while awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristi
18、cs of this product remain in force. BS EN 14451:2005EN 14451:2005 (E) 5 1 Scope This document specifies: a) field of application; b) requirements for in line anti-vacuum valves; c) dimensional, the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of
19、 in-line anti-vacuum valves DN 8 to DN 80; d) test method and requirements for verifying these properties; e) marking and presentation; f) acoustics. This document specifies the characteristics of in-line anti-vacuum valves DN 8 to DN 80 that are suitable for use in drinking water systems at pressur
20、es up to 1 MPa (10 bar) and temperatures up to 65 C and for 1 h at 90 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies. For undated references, the latest edition of the referenc
21、ed document (including any amendments) applies. EN 806-1:2000, Specifications for installations inside buildings conveying water for human consumption Part 1: General EN 1717:2000, Protection against pollution of potable water in water installations and general requirements of devices to prevent pol
22、lution by backflow 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 emission from appliances and equipment used in water supply installations Part 1: M
23、ethod of measurement (ISO 3822-1:1999) EN ISO 3822-3, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 3: Mounting and operating conditions for in-line valves and appliances (ISO 3822-3:1997) EN ISO 3822-4, Acoustics Laboratory tests
24、on noise emission from appliances and equipment used in water supply installations Part 4: Mounting and operating conditions for special appliances (ISO 3822-4:1997) EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular cross-section conduits running
25、 full - Part 1: General principles and requirements (ISO 5167-1:2003) 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, tolerances and designat
26、ion ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests BS EN 14451:2005EN 14451:2005 (E) 6 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following apply. in-line anti-vacuum valve mechanical device
27、with an air inlet which is closed when water flows through it at or above atmospheric pres-sure, but which opens to admit air if there is a subatmospheric pressure at the water inlet or when the flow stops, and closes so as to be watertight when the flow of water is resumed at normal pressure. In ca
28、se of subatmospheric pressure the obturator should admit air to the downstream pipework as well as throttling the inlet waterway of the device. It ensures no protection against back flow by back pressure. For the purpose of this document “in-line-anti-vacuum valve(s) DA“ is hereafter referred to as
29、“device(s)” 4 Nominal size The nominal size (DN) of the device shall correspond to the denomination of the thread according to Table 1. For the specification of threads see 8.2. Table 1 Nominal size vs thread size DN 8 10 15 20 25 32 40 50 65 80 Thread size 38 1 1 1 2 2 3 5 Designation The devices a
30、re designated by: a) name; b) reference to this document (EN 14451); c) family, type; d) nominal size (DN); e) body material; f) acoustic group ( DN 32 only). Example of designation: In-line antivacuum valve, EN 14451,family D, type A, DN 20, gun metal, 6 Marking and technical documents 6.1 General
31、In countries where the use of products made of dezincification resistant materials is not required, the dezincification resistant products according to EN ISO 6509, as well as the products which do not contain zinc, may be marked “DR“. BS EN 14451:2005EN 14451:2005 (E) 7 In countries where the use o
32、f dezincification resistant materials is required, the dezincification resistant products, as well as the products which do not contain zinc, shall be marked “DR“. 6.2 Marking The devices shall be marked permanently and visibly on the casing or on a fixed data plate. This information shall be on the
33、 upper side or on each lateral side of the device. The indications are to be indelible and obtained by moulding, engraving or similar procedures. The marking shall indicate: a) name, manufacturers brand or logo; b) arrow indicating normal direction of flow; c) nominal size (DN); d) acoustic group (
34、DN 32 only); e) letters indicating family and type of device; f) nominal pressure (PN); g) conformance with this document (EN 14451); h) maximum operating temperature C. Marking a), b), c), and e) are obligatory. In case there is no marking for d), the device shall be considered as not classified ac
35、oustically. 6.3 Technical documents Each package and/or each batch and/or each catalogue of the supplier/manufacturer shall contain technical product information which shall be written in a commonly spoken language of the country in which the product is sold. It shall provide the following informati
36、on: a) designation and purpose of the product; b) installation instructions; c) minimum installation height; d) (brand) name and address of supplier / manufacturer; e) instructions for maintenance, if any; f) spare part list, if any. BS EN 14451:2005EN 14451:2005 (E) 8 g) 7 Symbolization The graphic
37、 representation of the device is as follows (see Figure 1). Figure 1 Graphic symbol 8 General design characteristics 8.1 Design principle A typical design principle of DA device is given in Figure 2. Key 1 Air inlet 2 Seal 3 Floating disk 4 Water inlet 5 Water outlet 6 Vacuum back siphonage conditio
38、n 7 Zero flow Figure 2 Design principle of DA in-line anti-vacuum valve BS EN 14451:2005EN 14451:2005 (E) 9 8.2 Connections End connections shall comply with ISO 7-1 or EN ISO 228-1. 8.3 Air inlets Air inlets shall be shrouded and designed to ensure that they cannot easily be blocked by deposits. Di
39、mensions of external air inlets shall be minimum 4 mm (see Figure 2). 9 Physico-chemical characteristics 9.1 Materials The materials and the coatings used, liable to come normally or accidentally in contact with potable water, shall satisfy the EU regulations concerning water quality. The materials
40、and the coatings shall be: a) corrosion resistant in accordance with ISO 9227; b) prone to the least scaling possible; c) in conformity with the associated standards and regulations; d) compatible among themselves and with: water distributed; fluids or matter liable to come into contact with them; p
41、roducts normally used for disinfection operations of the network: potassium permanganate and sodium hypochlorite. 9.2 Nature of materials The choice of materials is left to the discretion of the manufacturer. a) Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when su
42、bmitted to water capable of dezincification. In countries where the use of products made of dezincification resistant materials is required, the products shall guarantee a dezincification depth less than 200 um in any direction, they shall be tested in accordance with EN ISO 6509 and shall be marked
43、 in compliance with the indications in Clause 6. b) Neither the materials nor 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 nat
44、ional regulations; c) The manufacturer shall state 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 standards exist shall comply with the relevant recommendations or standards
45、. BS EN 14451:2005EN 14451:2005 (E) 10 10 Characteristics and tests 10.1 General Examples shown in the figures are for guidance only. Laboratory equipment shall be designed to ensure that device can be tested in accordance with the requirements. The accuracy of measurements and accuracy of measuring
46、 instruments shall not exceed the following: a) Accuracy of measurements In the absence of any particular specifications: flow rate and pressure: 2 % of the value indicated; temperature: cold water 5 C of the value indicated; hot water 2 C of the value indicated; time: %100+of the value indicated; b
47、) Accuracy of measuring instruments Measuring instruments shall have a precision of 2 % of the measured value. Temperature measure-ments shall be accurate to 1 K. 10.2 Test sequenceThe sample of device for type testing shall be tested in accordance with the following sequence and installed in a vert
48、ical position to ensure that the float disc operates freely under the force of gravity. Minimum three (3) samples shall be submitted. The test sequence is specified in Annex A. Stage 1 Visual verification. See 10.3. Stage 2 Tightness. See 10.4. Stage 3 Flow rate/pressure loss. See 10.5. Stage 4 Bend
49、ing moment, mechanical strength of body and leak tightness. See 10.6. Stage 5 Tightness. See 10.7. Stage 6 Endurance. See 10.8. Stage 7 Vacuum. See 10.9. Stage 8 Tightness. See 10.10. For combined devices1)only the anti-pollution tests are to be performed. In case of a combined device with incorporated DA the values as mentioned in Stage 3 and 4 have to comply with the values as given in the applicable standards of that combined device. 1) Draw off taps, valve combinations etc. should also comply with a r
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