1、BRITISH STANDARDBS EN 14454:2005Devices to prevent pollution by backflow of potable water Hose union backflow preventer DN 15 to DN 32 Family H, type AThe European Standard EN 14454:2005 has the status of a British StandardICS 13.060.20; 23.060.01g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g
2、3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14454:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006ISBN 0
3、580 49318 0National forewordThis British Standard was published by BSI. It is the UK implementation of EN 14454:2005.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 represented on B
4、/504/4 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 obligations.Amendments issued since publi
5、cationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14454May 2005ICS 13.060.20; 23.060.01English versionDevices to prevent pollution by backflow of potable water - Hoseunion backflow preventer DN 15 to DN 32 - Family H, type ADispositifs de protection contre la pollution de
6、 leau potablepar retour - Disconnecteur dextrmit DN 15 DN 32 -Famille H, type ASicherungseinrichtungen zum Schutz des Trinkwassersgegen Verschmutzung durch Rckflieen -Sicherungsarmatur fr Schlauchanschlsse DN 15 bis DN32 - Familie H, Typ AThis European Standard was approved by CEN on 24 December 200
7、4.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 be obtained on a
8、pplication 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 Central Secretariat has
9、 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, Portugal, Slovak
10、ia,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 2005 CEN All rights of exploitation in any form and by any means reservedworldwide for C
11、EN national Members.Ref. No. EN 14454:2005: EEN 14454:2005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 4 Nominal sizes.6 5 Designation 6 6 Marking and technical documents.7 7 Symbolization.8 8 General design characteristics 9 9 Physico-
12、chemical characteristics10 10 Characteristics and tests 11 11 Acoustic characteristics .22 Annex A (normative) Sampling and test sequence24 EN 14454:2005 (E) 3 Foreword This document (EN 14454:2005) has been prepared by Technical Committee CEN/TC 164 “Water supply”, the secretariat of which is held
13、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 national standards shall be withdrawn at the latest by November 2005. This document has been developed with
14、 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 Regulations, the national standards organizations of the following countries are bound to implement
15、 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, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. E
16、N 14454:2005 (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 document provides no information as to whether the product may be used without restriction in any of the Member Stat
17、es 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 the characteristics of this product remain in force. EN 14454:2005 (E) 5 1 Scope This document specifies: a) field of application; b
18、) requirements for hose union backflow preventer; c) dimensional and the physico-chemical properties and the properties of general hydraulic, mechanical and acoustic design of hose union backflow preventers DN 15 to DN 32; d) test method and requirements for verifying these properties; e) marking an
19、d presentation; f) acoustics. This document specifies the characteristics of hose union backflow preventers DN 15 to DN 32 that are suit-able for use in drinking water systems 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 refe
20、renced 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 referenced document (including any amendments) applies. EN 806-1:2000, Specifications for installations inside buildings c
21、onveying 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 pollution by backflow EN ISO 228-1, Pipe threads where pressure-tight joints are not made on the threads Part 1: Dime
22、nsions, 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: Method of measurement (ISO 3822-1:1999) EN ISO 3822-3, Acoustics Laboratory tests on noise emission from appliances
23、 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 on noise emission from appliances and equipment used in water supply installations Part 4: Mounting and operating
24、conditions for special appliances (ISO3822-4:1997) EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices devices inserted in circu-lar cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1:2003) EN ISO 6509, Corrosion of metals and
25、 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 EN 14454:2005 (E) 6 ISO 9227, Corrosion tests in artificial atmospheres Salt spray tests 3 Terms and d
26、efinitions For the purposes of this document, the terms and definitions given in EN 1717:2000, EN 806-1:2000 and the following apply. hose union backflow preventer two pressure zones separated by a check valve. The check valve is closed at zero flow and the air inlets are open. Normal operation flow
27、 of water: check valve open; air inlets closed. For the purpose of this document “hose union backflow preventer(s) HA“ is (are) hereafter referred to as “de-vice(s)“ 4 Nominal size The nominal size of device (DN) shall correspond to the denomination of the thread according in Table 1. For specificat
28、ions of threads see 8.2. Table 1 Nominal size vs thread size DN 15 20 25 32 Thread size G G G 1 G 1 5 Designation The device is designated by: a) name; b) reference to this document (EN 14454); c) family, type; d) DN; e) body material; f) acoustic group. EXAMPLE of designation Hose union backflow pr
29、eventer, EN 14454, family H, type A, DN 20, gun metal, EN 14454:2005 (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 ISO 6509, as well as the
30、 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 shall be marked permanently
31、 and visibly on the body or on a fixed data plate. This information shall be on the outside of the device. The indications shall be indelible and obtained by moulding, engraving or similar procedures. The marking shall indicate: a) name, manufacturers brand or logo; b) arrow indicating normal direct
32、ion of flow; c) nominal size (DN); d) acoustic group; 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 acoustically. 6.3 Technical documents Each package and/or each batch
33、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: a) designation and purpose of the product; b) installation inst
34、ructions; c) minimum installation height; d) (brand) name and address of supplier / manufacturer; e) instructions for maintenance, if any; f) spare part list, if any. EN 14454:2005 (E) 8 7 Symbolization The graphic representation of the device is as follows (see Figure 1): Figure 1 Graphic symbol EN
35、 14454:2005 (E) 9 8 General design characteristics 8.1 Design principle A typical design principle of HA device is given in Figure 2. p1= p2= p atm 2 a) Zero flow p1 p2 atm 2 b) Zero flow p1 p22 c) Flow p15 D and h = 800 10 Key 1 Stop valve 2 Needle type valves 3 Pressure gauge 4 Test device 5 Trans
36、parent tube 6 Water reservoir h Vertical distance between the edge of the test specimen and the water level aWater supply Figure 3 Tightness test equipment 10.4.2 Tightness test of air inlets (dynamic test) 10.4.2.1 Procedure See Figure 3. a) Purge the test rig opening valves (1) and (2); b) Close v
37、alve (2) and then valve (1); c) Open valve (1) in time intervals 10 s and in steps of 0,02 MPa (0,2 bar) until a flow pressure of 0,1 MPa (1 bar) is reached; d) Observe the transparent tube (5) for air bubbles during the test. 10.4.2.2 Requirements a) No air bubbles in the transparent tube (5); b) N
38、o water leaking from the air inlets of test specimen. EN 14454:2005 (E) 13 10.4.3 Tightness test of the obturator (static test) 10.4.3.1 Procedure See Figure 3. a) Purge the test rig opening valves (1) and (2); b) Close valve (2) and then valve (1); c) If the transparent tube did not empty completel
39、y within 1 min, open valve (2) very slowly. Close valve (2) as soon as the water column in tube (5) begins to drop; d) Wait for 1 min; e) Open valve (2) slowly; f) Observe, if water leaks out of valve (2). 10.4.3.2 Requirement No water leaking from valve (2) (backflow prevention). EN 14454:2005 (E)
40、14 10.5 Flow rate/pressure loss test (Stage 3) 10.5.1 Flow rate 10.5.1.1 Test equipment Dimensions in millimetres L = 5 D h = 800 10 Key 1 Needle type valve 2 Valve 3 Flow meter 4 Standarized pressure take off, to EN ISO 5167-1 5 Pressure gauge 6 Test device 7 Coupling aWater supply Figure 4.1 Flow
41、rate/pressure loss test equipment 10.5.1.2 Procedure See Figure 4.1. Record the flow rate / pressure loss of the device over the full range from 0 to the flow rate given in Table 2. Verify if the value obtained corresponds to the requirement. NOTE If necessary the pressure loss in the piping length
42、between the test specimen and the pressure tap should be accounted for. EN 14454:2005 (E) 15 During the whole test, verify the leak tightness of the test specimen. 10.5.1.3 Requirements Any leakage shall be considered failure. The flow rate at the pressure loss of 0,05 MPa (0,5 bar) shall not be les
43、s than the values given in Table 2. Table 2 Nominal size vs flow rate DN 15 20 25 32 Flow rate (l/s) 0,3 0,65 1,1 1,9 10.5.2 Reverse flow rate 10.5.2.1 Test equipment L = 5 D Key 1 Needle type valve 2 Stop valve 3 Flow meter 4 Pressure gauge 5 Standardized pressure take off, according to EN ISO 5167
44、-1 6 Test device 7 Coupling aWater supply Figure 4.2 Reverse flow rate test equipment EN 14454:2005 (E) 16 10.5.2.2 Procedure See Figure 4.2. Record the flow rate/pressure loss of the device under test over the full range from 0 to the flow rate given in Table 2. Verify if the value obtained corresp
45、onds to the requirement. NOTE If necessary the pressure loss in the piping length between the device under test and the pressure taps should be accounted for. During the whole test, verify the leak tightness at the normal water inlet of the device under test. 10.5.2.3 Requirements Flow rates: see Ta
46、ble 2. Any leakage out of the normal water inlet of the device under test shall be considered as failure. 10.6 Back pressure tightness test (Stage 4) 10.6.1 Test equipment Dimensions in millimetres Key 1 4-way valve 2 Pressure gauge 3 Draw-off tap 4 Test device 5 Hose or accumulator16 Pressure gauge
47、 7 Stop valve Figure 5 Back pressure tightness testing equipment 1Capable of expanding its volume to about V 50 times of the volume of the membrane movement (see Figure 2: volume enclosed by the membrane in the position “zero flow (b)” and “backsiphonage”) when a pressure of 1,6 MPa (16 bar) is appl
48、ied EN 14454:2005 (E) 17 10.6.2 Procedure The purpose of this test is to verify the performance of the non-return function of the device under a back-pressure from the hose due to a pressure drop in the supply line. See Figure 5. Install the device according to the manufacturers instructions and pur
49、ge the test rig. Build up a water column of approximately 20 mm in the sight tube and close (1) c). a) Close valve (7) while water is flowing. b) Raise the pressure (6) to 1 MPa 0,1 MPa (10 bar 1 bar) and change valve (1) to a fully closed position (d). c) Wait 2 min. d) Verify the pressure. e) Verify the tightness of the air inlets. f) In case the pressure has dropped to less than 0,9 MPa (9 bar) within these 2 min, increase the pressure to 1 MPa (10 bar) and start again. Only one correction is permitted
