1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1488:2000 The Europ
2、ean Standard EN 1488:2000 has the status of a British Standard ICS 91.140.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Building valves Expansion groups Tests and requirementsThis British Standard, having been prepared under the direction of the Sector Committee for Build
3、ing and Civil Engineering, was published under the authority of the Standards Committee and comes into effect on 15 October 2000 BSI 10-2000 ISBN 0 580 36460 7 BS EN 1488:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the official English l
4、anguage version of EN 1488:2000. The UK participation in its preparation was entrusted by Technical Committee B/504, Water supply, to Subcommittee B/504/7, Control and safety devices in drinking water systems, which has the responsibility to: aid enquirers to understand the text; present to the resp
5、onsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. A list of organizations represented on this subcommittee can be obtained on request to i
6、ts secretary. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI S
7、tandards Electronic Catalogue. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of
8、 pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 22, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1488 Marc
9、h 2000 ICS 91.140.60 English version Building valves - Expansion groups - Tests and requirements Robinetterie de btiment - Groupes dexpansion - Essais et prescriptions Gebudearmaturen - Sicherheitsgruppen fr Expansionswasser - Prfungen und Anforderungen This European Standard was approved by CEN on
10、3 February 2000. CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may
11、 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 translation under the responsibility of a CEN member into its own language and notified to the Cent
12、ral Secretariat has the same status as the official versions. CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdo
13、m. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPEN DE NORMALISATION EUROPISCHES KOMITEE FR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1488:2000 EPage 2
14、 EN 1488:2000 BSI 10-2000 CONTENTS Page Foreword 3 Introduction 3 1 Scope 4 2 Normative references 4 3 Definitions 5 4 Materials and surface finishes 6 5 Design and dimensional requirements 7 6 Hydraulic tests and requirements 9 7 Mechanical tests and requirements 11 8 Acoustic tests and requirement
15、s 12 9 Tests and requirements of the components of the expansion group 13 10 Classification 19 11 Designation 20 12 Marking 20 ANNEX A (INFORMATIVE) 21Page 3 EN 1488:2000 BSI 10-2000 FOREWORD This European Standard has been prepared by Technical Committee CEN/TC 164 “Water supply“, the secretariat o
16、f 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 September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According to the CE
17、N/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Swede
18、n, Switzerland and the United Kingdom. The product standards on check valves are currently being worked out within CEN/TC 164/WG 4. The requirements for the endurance tests that will be laid down for these products may cause the revision of the present standard for reasons of homogeneity. INTRODUCTI
19、ON In respect of potential adverse effect on the quality of water intended for human consumption, caused by the product covered by this standard: a) This standard 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 sh
20、ould be noted that, whilst awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and/or the characteristics of this product remain in force.Page 4 EN 1488:2000 BSI 10-2000 1 SCOPE This European Standard specifies dimensions, materials and performance
21、 requirements (including methods of test) for expansion groups, of nominal sizes from DN 15 to DN 40, having working pressures 1) from 0,1 MPa (l bar) to 1,0 MPa (10 bar). Expansion groups are intended for fitting to the cold water supply of storage water heaters, having a maximum distribution tempe
22、rature of 95C, for all energy sources. Expansion groups limit pressure, in the water heater to which they are fitted, that is produced by thermal expansion of the water. Expansion groups do not control temperature and alone do not constitute the protection required for storage water heaters. NOTE: T
23、he use of the device specified in this standard does not override the need to use controls (e.g. thermostats and thermal cut-outs) which act directly on the power sources of water heaters. 2 NORMATIVE REFERENCES This European Standard incorporates, by dated or undated reference, provisions from othe
24、r publications. These normative references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or
25、revision. For undated references the latest edition of the publication referred to applies. EN 1254-2 Copper and copper alloy - Plumbing fittings - Part 2: Fittings with compression ends for use with copper tube. EN 1982 Copper and copper alloys - Ingots and castings. EN 12420 Copper and copper allo
26、ys - Forgings. 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 3822-3:1997 Acoustics - Laboratory tests on noise emission from appliances and equipment used in wate
27、r supply installations - Part 3: Mounting and operating conditions for in-line valves and appliances (ISO 3822-3:1997). EN ISO 6509 Corrosion of metals and alloys - Determination of dezincification resistance of brass (ISO 6509:1981). ISO 7-1:1994 Pipe threads where pressure-tight joints are made on
28、 the thread - Part 1: Dimensions, tolerances and designation. ISO 228-1:1994 Pipe threads where pressure-tight joints are not made on the thread - Part 1: Dimensions, tolerances and designation. ISO 7005-3:1988 Metallic flanges - Part 3: Copper alloy and composite flanges.1)All pressures are gauge u
29、nless otherwise stated.Page 5 EN 1488:2000 BSI 10-2000 3 DEFINITIONS For the purposes of this standard, the following definitions apply: 3.1 expansion group controls and limits the increase in fluid pressure, due to the normal increase in volume when water is heated, contained in a hot water heater,
30、 prevents the backflow of the heated water into the circuit and the contamination of water contained in the water heater with discharged water. An expansion group comprises, at least the following items in a single unit, in an upstream to downstream order as shown in table 1. Table 1 - Components of
31、 expansion groups DN 15 DN 20 DN 25 DN 32 DN 40 a n i s o l a t i n g v a l v e 11111 a t e s t p o r t f o r m o n i t o r i n g t h e c h e c k v a l v e 11111 a c h e c k v a l v e 11111 a n i s o l a t i n g v a l v e 1 *1 *1 *1 *1 * a n e x p a n s i o n v a l v e 11111 a drain device 1* 1* 1*
32、1* 1* a n a i r b r e a k t o d r a i n 11111 a pressure tapping 1* 1* 1* 1* 1* * optional 3.2 isolating valve allows the heated water produced to be isolated from the drinking water supply. If a second valve is to be fitted, it shall be between the check valve and the expansion valve. 3.3 check val
33、ve allows water to flow in the cold to hot direction when fitted to a water heater, and automatically prevents heated water returning to the cold water supply. 3.4 expansion valve limits the pressure of the water in the water heater to a predetermined value by discharging water to drain. 3.5 drain d
34、evice allows the water heater to be drained without it having to be removed. The outlet connection is also used to discharge water from the expansion valve. 3.6 air gap prevents discharged water from returning to the expansion group and thus to the water heater. 3.7 pressure tapping allows pressure
35、measuring equipment to be connected. 3.8 nominal set pressure (P nr ) is the pressure of the expansion valve which is set on production. 3.9 water tightness pressure (P e ) is the pressure up to which the expansion valve is closed (see figure 1). 3.10 initial opening pressure (P dc ) is the pressure
36、 at which the expansion valve opens for the first time, after a period of storage (see figure 1). 3.11 opening pressure (P o ) is the pressure at which a flow rate of 2,4 litres/hour of water is attained (see figure 1). 3.12 rating pressure (P dn ) is the pressure at which the water discharge capaci
37、ty of the expansion valve corresponds to the rated flow (see figure 1 and table 7).Page 6 EN 1488:2000 BSI 10-2000 3.13 closing pressure (P f ) is the pressure at which the expansion valve closes after having reached the rating pressure (see figure 1). Key 1) Pressure 2) Time Figure 1 - Pressures -
38、see Section 3 definitions 4 MATERIALS AND SURFACE FINISHES 4.1 General The selection of materials is the responsibility of the manufacturer, provided they satisfy the following requirements: a) materials and coatings shall not contaminate the drinking water, when in normal or accidental contact, b)
39、in a technical document, the manufacturer shall state the nature of the materials and coatings used, c) materials with inadequate corrosion resistance shall have additional protection, d) the materials used shall not deteriorate at a temperature of 95 C for 1 hour and be suitable under the temperatu
40、res specified in the tests in this Standard, and e) the components making up the check valve shall be of a material resistant to scale formation. 4.2 Nature of materials Examples of bronze and brass which may be used, without coating, for manufacturing purposes are given in table 2. Table 2 - Exampl
41、es of copper alloys Material Designation Symbol Reference Number EN Standard Cu Sn 5 Pb 5 Zn 5 - C CC491K EN 1982 Cu Sn 3 Zn 8 Pb 5 - C CC490K EN 1982 Cu Zn 39 Pb 3 CW614N EN 12420 Cu Zn 40 Pb 2 CW617N EN 12420 Cu Zn 36 Pb 2 As CZ132 -Page 7 EN 1488:2000 BSI 10-2000 Copper-zinc alloys containing mor
42、e than 10 % zinc are subject to dezincification when submitted to water capable of dezincification. In the countries where the use of products made of dezincification resistant materials is required, the products have to guarantee a dezincification depth less than 200 m in any direction, they have t
43、o be tested in accordance with the standard EN ISO 6509 and have to be marked in compliance with the indications under the section “MARKING“ (clause 12). 5 DESIGN AND DIMENSIONAL REQUIREMENTS 5.1 General guidance a) The expansion valve shall be of the type where the spring is isolated from the water
44、 by a diaphragm or equivalent. b) All sliding elements shall be designed to prevent any risk of seizure, scaling, or sticking. c) Sliding or rotating parts shall not be in contact with water. d) The components controlling the setting of the expansion valve shall not be accessible to the end user wit
45、hout damage to the valve. e) The expansion valve shall be so designed as to make the opening pressure no greater than 1,3 Pnr, and under this pressure, manual lift of the pressure safety valve shall be in conformity with the requirement of the test given in Section 9.6.1. f) Wing or similar guides o
46、f the expansion valve shall not be used on the inlet side of the expansion valve. g) The normal operation of the expansion valve shall not be influenced by external forces. h) The body of the expansion group shall have two suitable flats to apply a spanner. i) If there is only one direction for oper
47、ation of rotary controls of an expansion valve it shall be anti-clockwise. 5.2 Dimensional characteristics 5.2.1 End connections Examples of end connections are given in table 3. 5.2.2 Other connections (e.g. unions) Connections, other than those specified in section 5.2.1, shall be tested in accord
48、ance with section 7.2.3. 5.3 Test port (see figure 2) The test port, fitted with a plug, shall be positioned upstream of the seat of the check valve. It shall have the following dimensions: female thread diameter: G1/4, depth of thread: d 6,5 mm, diameter a 6 mm (or equivalent surface area), and dia
49、meter b shall allow sufficient gasket bearing surface.Page 8 EN 1488:2000 BSI 10-2000 Table 3 - Examples of end connections and nominal sizes (DN) Type 1) DN 15 DN 20 DN 25 DN 32 DN 40 a) Internal thread to ISO 7-1:1994 d Rp Rp Rp 1 Rp 1 Rp 1 b) External taper thread to ISO 7-1:1994 d R R R 1 R 1 R 1 c) Flat faced external thread toISO 228-1:1994 d G B G 1 B G 1 B G 1 B G 1 B d) External thread with shoulder toISO 228-1:1994 d G B G B G 1 B G 1 B G 1 B e) Compression fitting for copper pipe to EN 1254-2 d 15/18 22 28 35 4
