1、BRITISH STANDARDBS EN 14367:2005Non controllable backflow preventer with different pressure zones Family C, type AThe European Standard EN 14367:2005 has the status of a British StandardICS 91.140.60g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g
2、59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58BS EN 14367:2005This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 October 2006 BSI 2006ISBN 0 580 47599 9National forewordThis British Standar
3、d was published by BSI. It is the UK implementation of EN 14367:2005. 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 organizations represented on B/504/14 can be obtained on request to its secr
4、etary.The UK Committee would like to comment on the following:The reader is advised to take these statements of B/504 into account when applying this standard.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.Co
5、mpliance with British Standard cannot confer immunity from legal obligations.1. clause 9.2.2 specifies that all measuring instruments shall have an accuracy of 2 %, but this can be too wide compared with the tolerance for the temperature of the test water;2. in Figure 3 the correct orientation of th
6、e test sample on the test rig is not given, it is assumed that the inlet end of the device is to the left hand side of the figure;3. two figures have been labelled Figure 4;4. contradictory information is given in clause 9.6.2.1, it may be assumed that a certified check valve EB conforming to EN 139
7、59 having a closing pressure of 0,5 KPa will take precedence over any other check valve.Amendments issued since publicationAmd. No. Date CommentsEUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 14367June 2005ICS 91.140.60English VersionNon controllable backflow preventer with different pressurezone
8、s - Family C, type ADisconnecteur zones de pression diffrentes noncontrlables - Famille C - type ASystemtrenner mit unterschiedlichen nicht kontrollierbarenDruckzonen - Familie C, Typ AThis European Standard was approved by CEN on 3 February 2005.CEN members are bound to comply with the CEN/CENELEC
9、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 application to the Central Secretariat or to any CEN mem
10、ber.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 the same status as the officialversions.CEN members ar
11、e 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, Slovakia,Slovenia, Spain, Sweden, Switzerland and United King
12、dom.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 CEN national Members.Ref. No. EN 14367:2005: EEN 14367:2
13、005 (E) 2 Contents Page Foreword3 Introduction .4 1 Scope 5 2 Normative references 5 3 Terms and definitions .6 3.2 Specific use 7 4 Nominal size (denomination)7 4.1 Class a device 7 4.2 Class b device7 5 Designation 7 6 Symbolization.8 7 Physico-chemical characteristics8 7.1 Materials .8 7.2 Nature
14、 of the materials9 8 Design .9 8.1 General9 8.2 Relief valve .9 9 Characteristics and test methods10 9.1 General10 9.2 General tolerances.10 9.3 Expression of the results11 9.4 End connections11 9.5 Mechanical characteristics .11 9.6 Tightness characteristics .15 9.7 Hydraulic characteristics 18 10
15、Order of testing23 11 Marking and technical documents.23 11.1 Marking .23 11.2 Technical documents 24 12 Presentation at delivery 24 Annex A (normative) Complementary test methods on backflow preventers CA class b with a plastic body25 Annex B (informative) Examples of presentation of test results28
16、 EN 14367:2005 (E) 3 Foreword This document (EN 14367:2005) 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 endorse
17、ment, at the latest by December 2005, and conflicting national standards shall be withdrawn at the latest by December 2005. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for ident
18、ifying any or all such patent rights. According 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, Hunga
19、ry, Iceland, Ireland, Italy, Latvia, Lithuania, Luxem-bourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom. EN 14367:2005 (E) 4 Introduction In respect of potential adverse effects on the quality of water intended for human consumptio
20、n, caused by the product covered by this document: 1) 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; 2) It should be noted that, while awaiting the adoption of verifiable European criteria, existing natio
21、nal regulations concerning the use and/or the characteristics of this product remain in force. EN 14367:2005 (E) 5 1 Scope This document specifies the: field of application; the dimensional, the physico-chemical, the design, the hydraulic, the mechanical and the acoustic characteris-tics of non-cont
22、rollable backflow preventer with different pressure zones, family C, type A, nominal sizes DN 6 to DN 50, nominal pressure PN 10. It is applicable to: Family C, type A, class “a“ for general use: devices of class “a“ shall be capable of working: at any pressure up to 1 MPa (10 bar); with any pressur
23、e variation up to 1 MPa (10 bar); at a supply temperature limit of 65 C and 90 C for 1 h; Family C, type A, class “b“ for specific use: devices of class “b“ shall be capable of working: at any downstream pressure up to 0,3 MPa (3 bar); with any downstream pressure variation up to 0,3 MPa (3 bar); Th
24、e devices of class “b“ having specific hydraulic and no acoustic requirements and are meant for equipped filling devices built-in one or two functions boilers (heating only or heating and production of sanitation hot wa-ter).It concerns boilers with a 70 kW maximum power and maximum temperature of 1
25、10C. It specifies also: test methods and requirements for verifying these characteristics; marking; presentation and the delivery. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated refer-ences, only the edition cited applies.
26、For undated references the latest edition of the referenced document (including any amendments) applies. EN 1254-4, Copper and copper alloys Plumbing fittings Part 4: Fittings combining other end connections with capillary or compression ends. EN 1267:1999, Valves-Test of flow resistance using water
27、 as test fluid. EN 1717:2000, Protection 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 14367:2005 (E) 6 EN ISO 228-1, Pi
28、pe threads where pressure-tight joints are not made on the threads - Part 1: Dimensions, tolerances and designation (ISO 228-1:2000). EN ISO 3822-1:1999, Acoustics Laboratory tests on noise emission from appliances and equipment used in water supply installations Part 1: Method of measurement (ISO 3
29、822-1:1999). EN ISO 3822-3:1997, 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 . EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devi
30、ces inserted in circular cross-section conduits running 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 o
31、n the threads - Part 1: Dimensions, toler-ances and designation. ISO 965-1, ISO general-purpose metric screw threads - Tolerances - Part 1: Principles and ba-sic data.3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1717:2000 and the following apply. 3
32、.1 non controllable backflow preventer with different pressure zones Family C Type A the specific characteristics of this device called “CA”, are as follows: The device is divided into three zones: one upstream zone p1; one intermediate zone (pinot measurable) vented to the atmosphere; one downstrea
33、m zone p2. The device provides disconnection by venting the intermediate pressure zone to the atmosphere when the difference of pressure between the intermediate zone and the upstream zone is less than 10 % of the up-stream pressure (pi p115 or 12,5 mm2for devices DN 15 no dimension being less than
34、4 mm. The water passage through the discharge orifice shall have a cross-section of minimal 12,5 mm2. EN 14367:2005 (E) 10 The smallest dimension used to calculate this cross-section shall not be inferior to 4 mm for non-moving part. The control of the relief valve shall be of positive safety, i.e.
35、in case of rupture or leakage, the relief shall be open. This will be checked by examination of the behaviour of the device, after dismantling the control system of the relief valve (diaphragm, piston seal ). An air break to drain shall be placed at the discharge outlet. An air gap shall exist betwe
36、en any waste drain and any means to collect the discharged water (floor, tundish, curb, sink ). The device shall be capable, by design, evacuating the full relief flow rate as defined in 9.6.4 without spilling to the outside of the air break to drain. Class a device shall be equipped with: The air b
37、reak to drain shall meet the dimensional requirements of chapter 9 of EN 1717:2000. This air break to drain shall be: either directly incorporated into the device; or factory fitted; or supplied with the device. In the last two cases, the relief valve outlet of the device shall permit neither fittin
38、g of a standardized threaded pipe, nor the connection by the inside of a standardized pipe or shape, be it by glue, welding or interlocking. Class b device shall be equipped with: At least two air inlets openings with each a minimum cross-section of 12,5 mm2upstream of the relief pip-ing shall be in
39、corporated. The smallest dimension used to calculate this cross-section shall not be less than 4 mm. A discharge construction allowing fitting of a standardized threaded or plain pipe without disturbing the working of the relief valve system and without obturating, even partially, the air inlets ope
40、ning. 9 Characteristics and test methods 9.1 General Performance tests shall be carried out on the device as installed in accordance with the manufacturers tech-nical documents. 9.2 General tolerances 9.2.1 Accuracy of measurements In the absence of any particular specifications: flow rate and press
41、ure : 2 % of the value specified; temperature : cold water 5 K of the value specified; EN 14367:2005 (E) 11 hot water 2 K of the value specified; time: %100+of the value specified. 9.2.2 Accuracy of measuring instruments All the measuring instruments shall have an accuracy of 2 % of the measured val
42、ue. 9.3 Expression of the results The measured values shall be registered. These results can be expressed as a curve. See annex B for example. 9.4 End connections 9.4.1 Threaded end connections Devices with threaded connections shall be able to be dismounted without any damage to the piping. Example
43、: coupling nut, union. 9.4.1.1 Class a device The connections shall be in conformity with EN 1254-4, EN ISO 228-1 and ISO 7-1. 9.4.1.2 Class b device The connections of the device for separate installation and for integrated purposes shall be M10 1 (in accor-dance with ISO 965-1). For integrated pur
44、poses other connections are also permitted. 9.5 Mechanical characteristics 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 requirements. 9.5.1 Mechanical resistance of the body under pressure 9
45、.5.1.1 Requirement No visual permanent deformation or rupture of the body or the internal parts of the device shall occur. The test shall be carried out under the conditions defined in 9.5.1.2. 9.5.1.2 Test method Apply at the inlet of the device, in increments of 0,1 MPa (1 bar) per 5 s, an increas
46、e of the static water pressure up to 2,5 times the PN value, this equals 2,5 MPa (25 bar); Hold this pressure for 5 min. Observe the device and note any observations. Verify that the device satisfies the requirement of 9.5.1.1. EN 14367:2005 (E) 12 9.5.2 Bending strength Tightness of the body 9.5.2.
47、1 Requirement There shall be no rupture nor permanent deformation or leakage on the body of the device. The test shall be carried out under the conditions defined in 9.5.2.2. 9.5.2.2 Test method Fasten the device onto the test bench with the supplied connections (special unions are not allowed). App
48、ly a load W as shown in Figure 3 corresponding to the bending moment shown in Table 2 (in this particular case class b device shall satisfy the DN 6 requirements), with a pressure of 1,6 MPa (16 bar) applied in increments 0,1 MPa (1 bar) per 5 s. Maintain the bending moment and the pressure for 10 m
49、in. When calculating the load W corresponding to the bending moment, loads introduced by the piping and taps and any loads coming from the test apparatus shall be accounted for. Verify that the device satisfies the requirement of 9.5.2.1. Dimensions in metres Key 1,2 Isolating valve 3 W Load Figure 3 Bending moment testing equipment Table 2 Nominal size versus bending moment DN 6 8 10 15 20 25 32 40 50 Bending moment Nm 10 30 40 80 150 300 400 500 600 9.5.3 Endurance 9.5.3.1 Requirement
