1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1491:2000 The Europ
2、ean Standard EN 1491:2000 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 valves 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 36459 3 BS EN 1491:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Standard is the official English l
4、anguage version of EN 1491:2000. It supersedes BS 6283-1:1991 which is withdrawn. 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 enqu
5、irers to understand the text; present to the responsible 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
6、this subcommittee can be obtained on request to its 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 Ind
7、ex”, or by using the “Find” facility of the BSI Standards 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 c
8、onfer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 18, an inside back cover and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EUROPEAN STAN
9、DARD NORME EUROPENNE EUROPISCHE NORM EN 1491 March 2000 ICS 91.140.60 English version Building valves - Expansion valves - Tests and requirements Robinetterie de btiment - Soupapes dexpansion - Essais et prescriptions Gebudearmaturen - Sicherheitsventile fr Expansionswasser - Prfungen und Anforderun
10、gen This European Standard was approved by CEN on 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
11、 references concerning such national standards 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 translation under the responsibility of a CEN mem
12、ber into its own language and notified to the Central 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, Port
13、ugal, Spain, Sweden, Switzerland and United Kingdom. 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 C
14、EN national Members. Ref. No. EN 1491:2000 EPage 2 EN 1491:2000 BSI 10-2000 CONTENTS Page Foreword 3 Introduction 3 1 Scope 4 2 Normative references 4 3 Definitions 4 4 Materials and surface finishes 5 5 Design and dimensional requirements 6 6 Hydraulic tests and requirements 7 7 Mechanical tests an
15、d requirements 12 8 Acoustic tests and requirements 14 9 Classification 14 10 Designation 15 11 Marking 15 Annex A (Informative): Safety equipment for water heaters 16Page 3 EN 1491:2000 BSI 10-2000 FOREWORD This European Standard has been prepared by Technical Committee CEN/TC 164, Water supply, th
16、e 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 September 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. Acco
17、rding to the CEN/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, Portuga
18、l, Spain, Sweden, Switzerland and the United Kingdom. Annex A of this European Standard is informative. INTRODUCTION 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
19、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, whilst awaiting the adoption of verifiable European criteria, existing national regulations concerning the use and or the characteristics of this product remain in for
20、ce.Page 4 EN 1491:2000 BSI 10-2000 1 SCOPE This European Standard specifies, dimensions, materials and performance requirements (including methods of test) for expansion valves, 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 valve
21、s are intended for fitting to the cold water supply of storage water heaters, having a maximum distribution temperature of 95 C, for all energy sources. Expansion valves do not control the temperature and alone does not constitute the protection required for storage water heaters. Expansion valves l
22、imit pressure, in the water heaters to what they are fitted, that is produced by thermal expansion of the water. NOTE: The use of the device specified in this standard does not override the need to use controls (e.g. thermostats and cut-outs) which act directly on the power sources of water heaters.
23、 2 NORMATIVE REFERENCES This European Standard incorporates, by dated or undated reference, provisions from other 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 revi
24、sions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated references the latest addition of the publication referred to applies. EN 1254-2 Copper and copper alloys - Plumbing fittings - Part 2: Fittings with compression ends
25、 for use with copper tubes. EN 1982 Copper and copper alloys - Ingots and castings. EN 12420 Copper and copper alloys Forgings. 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
26、 made on the threads - 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. 3 DEFINITIONS For
27、 the purposes of this standard, the following definitions apply. 3.1 expansion valve opens automatically at a specified set pressure to discharge fluid. It is fitted to prevent the pressure of the water in the water heater from exceeding the maximum working pressure by discharging a quantity of wate
28、r to the drain1)All pressures are gauge unless otherwise stated.Page 5 EN 1491:2000 BSI 10-2000 3.1 Pressures 3.2.1 nominal set pressure (P nr ) pressure of the expansion valve which is set on production Key 1)Pressure 2)Time Figure 1 - Pressures - see Definitions 3.2.2 water tightness pressure (P e
29、 ) pressure up to which the expansion valve is still closed (see Figure 1) 3.2.3 initial opening pressure (P dc ) pressure at which the expansion valve opens for the first time, as indicated by the first droplet of water, after a period of storage (see Figure 1) 3.2.4 opening pressure (P o ) pressur
30、e at which a flow rate of 2,4 litre/hour of water is attained (see Figure 1) through the expansion valve 3.2.5 rating pressure (P dn ) pressure at which the water discharge capacity of the expansion valve corresponds to the rated flow (see Figure 1 and Table 3) 3.2.6 closing pressure (P f ) pressure
31、 at which the expansion valve closes after having reached the rating pressure (see Figure 1) 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 contam
32、inate the drinking water, when in normal or accidental contact;Page 6 EN 1491:2000 BSI 10-2000 b) 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; and d) the materi
33、als used shall not deteriorate at a temperature of 95 C for 1 hour and be suitable under the temperatures specified in the tests in this standard. 4.2 Nature of materials Examples of bronze and brass which may be used, without coating, for manufacturing purposes are given in Table 1. Table 1 - Examp
34、les of copper alloys Material designation Symbol Reference number European 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 Copper-zinc alloys containing more than 10 % zinc are subje
35、ct 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 to be tested in accordance
36、with the standard EN ISO 6509 and have to be marked in compliance with the indications under section 11. 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 by a diaphragm or equivalent. b) All sliding ele
37、ments shall be designed to prevent any risk of seizure, scaling or sticking. c) Sliding or rotating parts of expansion valves 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 without damage to the valve. e )
38、The expansion valve shall be designed as to make the opening pressure in no case greater than 1,3 P nrand under this pressure, manual lift of the expansion valve shall be in conformity with the requirements of the tests given in section 6.4.1. f) Wing or similar guides of the expansion valve shall n
39、ot 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 valve shall have two suitable flats to apply a spanner. i) If there is only one direction for operation of rotary controls of a
40、n expansion valve, it shall be anti-clockwise.Page 7 EN 1491:2000 BSI 10-2000 5.2 Pressures General: For set pressures below 0,3 MPa (3 bar) the same differential pressures shall be used as for 0,3 MPa (3 bar). EXAMPLE: an expansion valve with the set pressure of 0,2 MPa (2 bar) shall have a rating
41、pressure P dnequal to 0,23 MPa (2,3 bar). 5.2.1 Nominal set pressure (P nr ) The nominal set pressure shall not be greater than 1,0 MPa (10 bar); and a set pressure of 0,6 MPa (6 bar) is recommended. 5.2.2 Water tightness pressure (P c ) The water tightness pressure is related to the nominal set pre
42、ssure (P nr ) by: P e minimum= 0,95 P nr 5.2.3 Opening pressure (P o ) The opening pressure is related to the nominal set pressure (P nr ) by: P o= 1,1 P nr 5.2.4 Rating pressure (P dn ) The rating pressure is related to the nominal set pressure (P nr ) by: P dn= 1,2 P nr 5.2.5 Closing pressure (P f
43、 ) The closing pressure is related to the nominal set pressure (P nr ) by: P f minimum= 0,75 P nr 5.3 Dimensional characteristics The nominal outlet diameter of the expansion valve shall be at least equal to the inlet dimension. 5.3.1 End connections Examples of end connections are given in Table 2.
44、 5.3.2 Other connections (e.g. unions) Connections, other than those specified in section 5.3.1, shall be tested in accordance with section 7.2.3. 5.3.3 Exclusions Connections requiring the use of heat to make or break the joint (e.g. capillary) are not permitted. 6 HYDRAULIC TESTS AND REQUIREMENTS
45、6.1 Tolerances Unless otherwise specified, all tolerances shall be 5 %.Page 8 EN 1491:2000 BSI 10-2000 6.2 Cold water pressure tests 6.2.1 General The expansion valve shall be stored, in the closed position, at ambient temperature for a minimum of period of 8 days before commencing tests. Connect th
46、e expansion valve by its water heater connection to the test apparatus having water at ambient temperature (maximum 25 C).Page 9 EN 1491:2000 BSI 10-2000 Table 2 - 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 1/2 Rp
47、3/4 Rp 1 Rp 1 1/4 Rp 1 1/2 b) External taper thread toISO 7-1:1994 d R 1/2 R 3/4 R 1 R 1 1/4 R 1 1/2 c) Flat faced external thread to ISO 228-1:1994 d G 3/4 B G 1 B G 1 1/4 B G 1 1/2 B G 1 3/4 B d) External thread with shoulder to ISO 228-1:1994 d G 1/2 B G 3/4 B G 1 B G 1 1/4 B G 1 1/2 B e) compres
48、sion fitting for copper pipe to EN 1254-2 d 15/18 22 28 35 42 f) flange to ISO 7005-3:1998 D d K 95 75 14 105 c75 014 115 085 014 140 100 018 150 110 018 1)reference dimensionPage 10 EN 1491:2000 BSI 10-2000 6.2.2 Water tightness pressure (P e ) test Procedure: Increase the pressure until the expans
49、ion valve opens. Requirement: The opening pressure of the expansion valve shall be in the range P eto P dn . Procedure: Decrease the pressure to 0,4 P nr . Increase the pressure to 0,95 P nr(tightness pressure) for a period of 120 s. Requirement: The valve shall be water tight for a period of 120 s. 6.2.3 Nominal flow opening pressure (P o ) test Procedure: Increase the water pressure until a flow rate of 2,4 litre/hour is achieved. Record this as the opening pressure P o . Requirement: P oshall not be greater than 1,05 P nr . 6.2.4 Nominal r
