1、| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | BRITISH STANDARD BS EN 1490:2000 The Europ
2、ean Standard EN 1490:2000 has the status of a British Standard ICS 91.140.60 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW Building valves Combined temperature and pressure relief valves Tests and requirementsThis British Standard, having been prepared under the direction of
3、 the Sector Committee for Building 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 36462 3 BS EN 1490:2000 Amendments issued since publication Amd. No. Date Comments National foreword This British Sta
4、ndard is the official English language version of EN 1490:2000. It supersedes BS 6283-3:1991 which is withdrawn.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
5、the responsibility to: aid enquirers 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 o
6、f organizations represented on 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 “Internation
7、al Standards Correspondence Index”, 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 Britis
8、h Standard does not of itself confer immunity from legal obligations. Summary of pages This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 25 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued.EURO
9、PEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 1490 March 2000 ICS 91.140.60 English version Building valves - Combined temperature and pressure relief valves - Tests and requirements Robinetterie de btiment - Soupapes combines temprature et pression - Essais et prescriptions Gebudearmaturen - Kom
10、binierte Druck-Temperaturventile - Prfungen und Anforderungen This European Standard was approved by CEN on 3 January 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 wit
11、hout any alteration. Up-to-date lists and bibliographical 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
12、made by translation under the responsibility of a CEN member 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, Icela
13、nd, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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 exploitat
14、ion in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1490:2000 EPage 2 EN 1490:2000 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
15、 Hydraulic and temperature tests and requirements 11 7 Mechanical tests and requirements 16 8 Acoustic tests and requirements 18 9 Classification 18 10 Designation 18 11 Marking 18 12 Installation instructions 19 Annex A (informative): Safety equipment for water heaters 24Page 3 EN 1490:2000 BSI 10-
16、2000 FOREWORD This European Standard 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 S
17、eptember 2000, and conflicting national standards shall be withdrawn at the latest by September 2000. According 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, De
18、nmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, 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 h
19、uman 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 should be noted that, whilst awaiting the adoption of verifiable European criteria,
20、 existing national regulations concerning the use and or the characteristics of this product remain in force.Page 4 EN 1490:2000 BSI 10-2000 1 SCOPE This European Standard specifies, dimensions, materials and performance requirements (including methods of test) for combined temperature and pressure
21、relief 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). Combined temperature and pressure relief valves are intended for fitting to storage water heaters, having a maximum distribution temperature of 95 C, for all energy sources. Comb
22、ined temperature and pressure relief valves control and limit the temperature and pressure of the water contained in a hot water heater to the valves rating pressure and a temperature not exceeding 100 C and will prevent water to steam formation when other temperature controls fail. They are not int
23、ended to act as an expansion valve under normal conditions and do not control cold water flow. Alone the valve does not constitute the control functions for a water heater. NOTE: The use of the device specified in this standard does not override the need to use controls (e.g. thermostats and cut-out
24、s) which act directly on the power sources of water heaters. 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 herea
25、fter. 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 revision. For undated references the latest addition of the publication referred to applies. EN 1254-2 Copper and copper alloys
26、- Plumbing fittings - Part 2: Fittings with compression ends 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
27、). ISO 7-1:1994 Pipe threads where pressure-tight joints are 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 - P
28、art 3: Copper alloy and composite flanges.1)All pressures are gauge unless otherwise stated.Page 5 EN 1490:2000 BSI 10-2000 3 DEFINITIONS For the purposes of this standard, the following definitions apply. 3.1 temperature relief valve temperature activated valve which opens automatically at a specif
29、ied set temperature to discharge fluid. It is fitted to water heaters to prevent the temperature of the contained water from exceeding 100 C 3.2 pressure relief valve pressure activated valve which opens automatically at a specified set pressure to discharge fluid. It is fitted to prevent the pressu
30、re in a water heater from exceeding the maximum working pressure 3.3 combined temperature and pressure relief valve valve which is capable of performing the function of both a temperature relief valve and a pressure relief valve 3.4 thermal element provides the thermal control; comprising a thermal
31、probe and associated control rods 3.5 Pressures 3.5.1 nominal set pressure (P nr ) pressure of the combined temperature and pressure relief valve which is set on production 3.5.2 water tightness pressure (P e ) pressure up to which the combined temperature and pressure relief valve is closed (see Fi
32、gure 1) 3.5.3 initial opening pressure (P dc ) pressure at which the combined temperature and pressure relief valve opens for the first time, as indicated by the first droplet of water, after a period of storage (see Figure 1) 3.5.4 opening pressure (P o ) pressure at which a flow rate of 2,4 litre/
33、hour of water is attained through the combined temperature and pressure relief valve (see Figure 1) 3.5.5 rating pressure (P dn ) pressure at which the water discharge capacity of the combined temperature and pressure relief valve corresponds to the rated flow (see Figure 1) 3.5.6 closing pressure (
34、P f ) pressure at which the combined temperature and pressure relief valve closes after having reached the rating pressure (see Figure 1) 3.6 Temperatures 3.6.1 maximum working temperature maximum temperature at which the combined temperature and pressure relief valve is designed to be used 3.6.2 no
35、minal set temperature temperature range, 90 C to 95 C, in which the combined temperature and pressure relief valve is set to operate 3.6.3 initial opening temperature temperature at which the combined temperature and pressure relief valve opens, as indicated by the first droplet of water, after a pe
36、riod of storage 3.6.4 closing temperature temperature at which the combined temperature and pressure relief valve closes after discharging under temperature conditions 3.6.5 rated steam discharge capacity minimum rate of steam discharge, kilogram/hour, that can be discharged through the valve under
37、the conditions specified in the test in section 6.5 3.6.6 water discharge capacity rate of water discharge, litre/hour, that can be discharged through the combined temperature and pressure relief valve under the conditions specified in the test in section 6.4Page 6 EN 1490:2000 BSI 10-2000 Key 1)Pre
38、ssure 2)Time Figure 1 - Pressures - see Definitions 3.6.7 nominal power rating power rating, in Table 9, to be assigned to a combined temperature and pressure relief valve, as appropriate, which meets the test criteria of tests in sections 6.4 and 6.5 4 MATERIALS AND SURFACE FINISHES 4.1 General The
39、 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) in a technical document, the manufacturer shall state the nature of the ma
40、terials and coatings used; c) material with inadequate corrosion resistance shall have additional protection; and d) the materials 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 Ex
41、amples of bronze and brass which may be used, without coating, for manufacturing purposes are given in Table 1.Page 7 EN 1490:2000 BSI 10-2000 Table 1 - Examples 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
42、 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 subject to dezincification when submitted to water capable of dezincification. In the countries where the use of products made of dezincification r
43、esistant 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 with the standard EN ISO 6509 and have to be marked in compliance with the indications under section 11. 5 DESIGN AND DIMENSIONAL REQUIREMENTS
44、 5.1 General guidance a) The combined temperature and pressure relief valve shall be of the type where the spring is isolated from the water. b) All components shall be designed so as to avoid any risk of seizing, scaling or sticking. c) Sliding or rotating parts shall not be in contact with water,
45、except for the thermal element. d) The components controlling the setting of pressure and temperature valve shall not be accessible to the end user without damage to the valve. e) The thermal element shall be so designed that contact by water on the thermally responsive material is prevented. f) Win
46、g or similar guides shall not be used on the inlet side of the combined temperature and pressure relief valve see Figure 2d). g) For combined temperature and pressure relief valves with threaded ends, two spanner flats shall be provided on the body. h) The normal operation of the combined temperatur
47、e and pressure relief valve shall not be influenced by external forces. i) If there is only one direction for operation of rotary controls of a combined temperature and pressure relief valve, it shall be anti-clockwise. j) Where separate seats are fitted to the combined temperature and pressure reli
48、ef valve disc or body, they shall be secured to prevent them from working loose in normal service. 5.2 Pressures For set pressures below 0,3 MPa (3 bar), the same differential pressures shall be used as for 0,3 MPa (3 bar). EXAMPLE: a combined temperature and pressure relief valve with a set pressur
49、e of 0,2 MPa (2 bar) shall have a rating pressure of P dnequal to 0,23 MPa (2,3 bar), see Figure 1.Page 8 EN 1490:2000 BSI 10-2000 5.2.1 Nominal set pressure (P nr ) The nominal set pressure shall not be greater than 1,0 MPa (10 bar). 5.2.2 Water tightness pressure (P e ) The water tightness pressure is related to the nominal set pressure (P nr ) by: P e minimum= 0,95 P nr 5.2.3 Opening pressure (P o ) The opening pressure P ois related to the nominal set pressure (P nr ) by: P = 1,1 P nr 5.2.4 Rating pressure (P dn ) The rating pressure is
