1、BRITISH STANDARDBS EN 14455:2005Devices to prevent pollution by backflow of potable water Pressurised air inlet valves DN 15 to DN 50 Family L, type A and type BThe European Standard EN 14455:2005 has the status of a British StandardICS 13.060.20; 23.060.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43
2、g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14455:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2
3、006ISBN 0 580 49317 2National forewordThis British Standard was published by BSI. It is the UK implementation of EN 14455:2005. 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 repre
4、sented on B/504/4 can be obtained on request to its secretary.Attention is drawn to the requirement in 10.12 to not remove the test sample from the test rig (Figure 8) whilst conducting the repeated test of 10.7. BSI Technical Committee B/504 is of the opinion that the test rig of 10.7 (Figure 6) sh
5、ould be modified to connect it to the vacuum line of Figure 8 whilst maintaining the essential pipe length “L” defined in Figure 6.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 Stan
6、dard cannot confer immunity from legal obligations.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14455May 2005ICS 13.060.20; 23.060.01English versionDevices to prevent pollution by backflow of potable water -Pressurised air inlet valves DN
7、 15 to DN 50 - Family L, type Aand type BDispositifs de protection contre la pollution de leau potablepar retour - Clapet dentre dair sous pression DN 15 DN50 - Famille L, type A et type BSicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen -Druckbeaufschlagte Rohrb
8、elfter in Durchflussform DN 15bis DN 50 - Familie L, Typ A und Typ BThis 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 standa
9、rd 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 langu
10、age 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,Germa
11、ny, Greece, Hungary, Iceland, Ireland, Italy, 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 Cen
12、tre: rue de Stassart, 36 B-1050 Brussels 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 14455:2005: EEN 14455:2005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 No
13、minal size .6 5 Designation 6 6 Marking and technical documents.7 7 Symbolisation 7 8 General design characteristics 9 9 Physico-chemical characteristics10 10 Characteristics and tests 11 11 Acoustic characteristics .20 Annex A (normative) Sampling and test sequence.22 EN 14455:2005 (E) 3 Foreword T
14、his document (EN 14455:2005) 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 latest by November
15、 2005, and conflicting national 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“. Accordi
16、ng 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, Lithuani
17、a, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14455:2005 (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 docu
18、ment: a) this 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 regu-lations concerning the use and/or th
19、e characteristics of this product remain in force. EN 14455:2005 (E) 5 1 Scope This document specifies: a) field of application; b) requirements for pressurised air inlet valves; c) dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic desig
20、n of pressurised air inlet valves DN 15 to DN 50; d) test procedure and requirements for verifying these properties; e) marking and presentation; f) acoustics. This document specifies the characteristics of pressurised air inlet valves DN 15 to DN 50 that are suitable for use in drinking water syste
21、ms at pressures 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
22、 the referenced 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 t
23、o prevent pollution by backflow EN 13959, Anti-pollution check valves DN 6 to DN 250 inclusive family E, type A, B, C and D ENISO 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 Labor
24、atory tests on noise emission from appliances and equipment used in water supply installations Part 1: Method 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 c
25、onditions for in-line valves and appliances (ISO 3822-3:1997) 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 ISO 6509, Corrosion of metals a
26、nd 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: Designation, dimensions and tolerances ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests EN 14455:2005 (E) 6 3 Terms and
27、 definitions For the purposes of this document, the terms and definitions given in EN 1717, EN 806-1 and the following apply. 3.1 pressurised air inlet valve “LA“ valve fitted with one or more air inlet ports which are normally closed, when the water is above or equal to the atmospheric pressure in
28、the valve. The valve opens to admit air if there is a subatmospheric pressure at the water inlet, and closes to be watertight when the flow of water is resumed at normal pressure NOTE LA protects against back siphonage. 3.2 pressurised air inlet valve combined with a check-valve located downstream “
29、LB“ valve LA with integrated in-line check valve of family E, type EB, located downstream. For the purpose of this document, “pressurised air inlet valve(s)” is (are) hereafter referred to as “device(s)” 4 Nominal size The nominal size of the device shall correspond to the denomination of thread acc
30、ording to Table 1 and ISO 7-1. Table 1 Nominal size vs thread size DN 15 20 25 32 40 50 Thread size 1 1 1 2 5 Designation The devices are designated by: a) name; b) reference to this document (EN 14455); c) family, type; d) DN; e) body material; f) acoustic group ( DN 32 only). Example of designatio
31、n Pressurised air inlet valve, EN 14455, family L, type A, DN 20, gun metal, I EN 14455:2005 (E) 7 6 Marking and technical documents 6.1 General In countries where the use of products made of dezincification resistant materials is not required, the dezincification resistant products according to EN
32、ISO 6509, as well as the products which do not contain zinc, may be marked “DR“. In countries where the use of 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 sha
33、ll be marked permanently and visibly on the body or on a fixed data plate. This information shall be on the upper side or on each lateral side of the device. The indications shall be indelible and obtained by moulding, engraving or similar procedures. The marking shall indicate: a) name, manufacture
34、rs brand or logo; b) arrow indicating normal direction of flow; c) nominal size (DN); d) acoustic group ( DN 32 only); e) letters indicating family and type of device. Marking a), b), c), and e) are obligatory. In case there is no marking for d), the device shall be considered as not classified acou
35、stically. 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 information
36、: 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. 7 Symbolisation The graphic representation of the devices is according
37、 to EN 1717 (see Figure 1): EN 14455:2005 (E) 8 Figure 1 Graphic symbol EN 14455:2005 (E) 9 8 General design characteristics 8.1 Design principle A typical design principle of LA and LB is given in Figure 2. Dimensions in millimetres a) LA: Flow condition and zero condition b) LA: Back siphonage con
38、dition c) LB: Flow condition d) LB: Zero flow condition e) LB: Back siphonage condition Key 1 Water flow 2 Air Figure 2 Design principle EN 14455:2005 (E) 10 8.2 Connections Connections shall comply with EN ISO 228-1 or ISO 7-1. 8.3 Air inlets Air inlets shall be shrouded and designed to ensure that
39、 they cannot easily be blocked by deposits. Dimensions of external air inlets shall be minimum 4 mm (see Figure 2). 8.4 Check valve The check valve of an LB has to comply with all requirements of EN 13959. 9 Physico-chemical characteristics 9.1 Materials The materials and the coatings used, liable t
40、o come 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 in accordance with ISO 9227; b) prone to the least scaling possible; c) in conformity with the associated standard
41、s and regulations; d) compatible among themselves and with: water distributed; fluids or matter liable to come into contact with them; products normally used for desinfection operations of the network: potassium permanganate and so-dium hypochlorite. 9.2 Nature of materials The choice of materials i
42、s left to the discretion of the manufacturer. a) Copper-zinc alloys containing more than 10 % zinc are subject to denzincification when submitted to wa-ter capable of dezincification. In the countries where the use of products made of dezincification resistant materials is required, the products sha
43、ll guarantee a dezincification depth less than 200 m in any direc-tion, they shall be tested in accordance with EN ISO 6509 and shall be marked in compliance with the in-dications in Clause 6. b) Neither the materials nor coatings used shall, by normal or accidental contact with drinking water, caus
44、e 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 state in his technical and sales literature the nature of the materials and the coat-ings selected; d) The mate
45、rials, and in particular copper alloys, for which recommendations or standards exist shall comply with the relevant recommendations or standards. EN 14455:2005 (E) 11 10 Characteristics and tests 10.1 General Examples shown in the figures are for guidance only. Laboratory equipment shall be designed
46、 to ensure that the devices can be tested in accordance with the requirements. The accuracy of measurements and accuracy of measuring 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 indi
47、cated; temperature: cold water 5 C of the value indicated; hot water 2 C of the value indicated; time: %100+of the value indicated; b) 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
48、 Test sequence Three samples shall be submitted. The test sequence is specified in Annex A. Stage 1: Visual verification. See 10.3; Stage 2: Mechanical strength of the body. See 10.4; Stage 3: Tightness. See 10.5; Stage 4: Flow rate/pressure loss. See 10.6; Stage 5: Vacuum, fast. See 10.7; Stage 6:
49、Bending moment and leak tightness. See 10.8; Stage 7: Opening pressure. See 10.9; Stage 8: Endurance. See 10.10; Stage 9: Opening pressure. See 10.11; Stage 10: Vacuum, fast. See 10.12. In case of a combined device with incorporated LA or LB the values as mentioned in stages 2, 4 and 6 have to comply with the values as given in the applicable standards of that combined device. 10.3 Visual verification (Stage 1) Check by visual verification that: a) devices conform with the description and the appropriate drawi
