1、I BRITISH STANDARD Building valves - Combined temperature and pressure relief valves - Tests and requirements The European Standard EN 149Q2000 has the status of a British Standard ICs 91.140.60 NO COPYING WITBOUT BSI PEEMISSION EXCEPT AS PERMIlTED BY COPYRIGHT LAW BS EN 1490:2000 STD-BSI BS EN 1490
2、-ENGL 2000 I Lb24bb9 0876245 OT4 M STDeBSIBS 1 - - - EN L490-ENGL 2000 9 Lb24bb9 087b24b T30 9 BS EN 14902000 been prepared under the direction of the Sector AmdNo. Date Committee for Building and Civil Engineering, was published under the authority of the Standards Committee and comes into effect o
3、n 16 October 2000 Q BSI 10-2000 National foreword Comments This British Standard is the official English language version of EN 1490:2000. It supersedes BS 62833:1991 which is withdrawn. The UK participation in its preparation was entrusted by Technical Committee WW, Water supply, to Subcommittee MW
4、7, Control and safety devices in drinking water systems, which has the responsibity to: - aid enquirers to understand the te - present to the responsible European committee any enquiries on the - monitor related intedonal and European developments and promulgate inkqretation, or proposals for change
5、, and keep the UK interests informed; them in the UK A list of organizations represented on this subcommittee can be obtained on request to its secretary. Cross-references The British Standards which implement intedonal or European publications referred to in this document may be found in the BSI St
6、andards Catalogue under the section entitled “International Stan- Correspondence Index”, or by using the “Find” faciiity 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
7、 their correct application Compliance with a British 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 titie page, pages 2 to 25 and a back cover. The BSI copyright notice displayed in this docume
8、nt indicates when the document was last issued. ISBN O 580 36162 3 - - STD.BI BS EN 349O-ENGL 2000 m lb24bh9 087b247 977 m EUROPEAN STANDARD EN 1490 NORME EUROPEENNE EUROPISCHE NORM March 2000 ICs 91.140.60 English version Building valves - Combined temperature and pressure relief valves - Tests and
9、 requirements Robinetterie de btiment - Soupapes combines temprature et pression - Essais et prescriptions Gebudearmaturen - Kombinierte Druck-Temperaturventile - PrOfungen und Anforderungen This European Standard was approved by CEN on 3 January 2000. CEN members are bound to comply with the CENICE
10、NELEC Internal Regulations which stipulate the conditions for giving this Europsan Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning sich national standards may be obtained on application to the Central Secretadat or to any
11、CEN member. This European Standard exists in three official versions (English, French, German). A version in any other language made by traislation under the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as tie official versions. CEN
12、 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 Kingdom. EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT EUROPfiEN DE NORM
13、ALISATION EUROPISCHES KOMITEE FUR NORMUNG Central Secretariat: rue de Stassart, 36 B-1050 Brussels Q 2000 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1490:2000 E Page 2 EN 1490:2000 CONTENTS Page Foreword Introduction 1 Scope 2
14、 Normative references 3 Definitions 4 Materials and surface finishes 5 Design and dimensional requirements 6 7 Mechanical tests and requirements 8 Acoustic tests and requirements 9 Classification 1 O Designation 11 Marking 12 Installation instructions Hydraulic and temperature tests and requirements
15、 Annex A (informative): Safety equipment for water heaters 3 3 4 4 5 6 7 11 16 18 18 18 18 19 24 BSI 10-2000 FOREWORD This European Standard has been prepared by Technical Committee CENTC 164, Water supply, the Secretariat of which is held by AFNOR. This European Standard shall be given the status o
16、f 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 CENKENELEC Internal Regulations, the national standards organizations of the f
17、ollowing 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, Sweden, Switzerland and the United Kingdom. Annex A of this European Standard is i
18、nformative. 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 as to whether the product may be used without restriction in any of the Member States of the
19、 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 force. Q BSI 10-2000 STD.BSI BS EN L490-ENGL 2000 m Lb24bb 087b250 4bL W Page 4 EN 1490:2000 1
20、SCOPE This European Standard specifies, dimensions, materials and performance requirements (including methods of test) for combined temperature and pressure relief valves, of nominal sizes from DN 15 to DN 40, having working pressures) Com 0,l MPa (1 bar) to 1,0 MPa (10 bar). Combined temperature an
21、d pressure relief valves are intended for fitting to storage water heaters, having a maximum distribution temperature of 95 OC, for all energy sources. Combined temperature and pressure relief valves control and limit the temperature and pressure of the water contained in a hot water heater to the v
22、alves rating pressure and a temperature not exceeding 100 “C and will prevent water to steam formation when other temperature controls fail. They are not intended to act as an expansion valve under normal conditions and do not control cold water flow. Alone the valve does not constitute the control
23、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-outs) which act directly on the power sources of water heaters. 2 NORMATIVE REFERENCES This European Standard incorporates, by dated or undated re
24、ference, 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 revisions of any of these publications apply to this European Standard only when incorp
25、orated in it by amendment or revision. For undated references the latest addition of the publication referred to applies. EN 1254-2 EN 1982 EN 12420 EN IS0 6509 IS0 7-1:1994 IS0 228- 1 1994 IS0 7005-31988 Copper and copper alloys - Plumbing fittings - Part 2: Fittings with compression ends for use w
26、ith copper tubes. Copper and copper alloys - Ingots and castings. Copper and copper alloys - Forgings. Corrosion of metals and alloys - Determination of dezincification resistance of brass (IS0 6509: 198 1). Pipe threads where pressure-tight joints are made on the threads - Part 1 : Dimensions, tole
27、rances and designation. Pipe threads where pressure-tight joints are not made on the thread - Part 1: Dimensions, tolerances and designation. Metallic flanges - Part 3: Copper alloy and composite flanges. ) All pressures are gauge unless otherwise stated. 8 BSI 10-2000 Page 5 EN 1490:2000 3 DEFINITI
28、ONS For the purposes of this standard, the following definitions apply. 3.1 temperature relief valve temperature activated valve which opens automatically at a specified set temperature to discharge fluid. It is fitted to water heaters to prevent the temperature of the contained water from exceeding
29、 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 pressure in a water heater from exceeding the maximum working pressure 3.3 combined temperature and pressure relief valve valve which is ca
30、pable 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 probe and associated control rods 3.5 Pressures 3.5.1 nominal setpressure (PnJ pressure of the combined temperature and pressure reli
31、ef valve which is set on production 3.5.2 water tightness pressure (P,) pressure up to which the combined temperature and pressure relief valve is closed (see Figure 1) 3.5.3 initial opening pressure (Pdc) pressure at which the combined temperature and pressure relief valve opens for the first time,
32、 as indicated by the first droplet of water, after a period of storage (see Figure 1) 3.5.4 openingpressure (Po) pressure at which a flow rate of 2,4 litrehour of water is attained through the combined temperature and pressure relief valve (see Figure 1) 3.5.5 ratingpressure (Pdn) pressure at which
33、the water discharge capacity of the combined temperature and pressure relief valve corresponds to the rated flow (see Figure 1) 3.5.6 closingpressure (P,) pressure at which the combined temperature and pressure relief valve closes after having reached the rating pressure (see Figure 1) 3.6 Temperatu
34、res 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 nominal set temperature temperature range, 90 “C to 95 OC, in which the combined temperature and pressure relief valve is set to operate 3.6.3 initial op
35、ening temperature temperature at which the combined temperature and pressure relief valve opens, as indicated by the first droplet of water, after a period of storage 3.6.4 closing temperature temperature at which the combined temperature and pressure relief valve closes after discharging under temp
36、erature conditions 3.6.5 rated steam discharge capacity minimum rate of steam discharge, kilogramhour, that can be discharged through the valve under the conditions specified in the test in section 6.5 3.6.6 water discharge capacity rate of water discharge, litrehour, that can be discharged through
37、the combined temperature and pressure relief valve under the conditions specified in the test in section 6.4 Q BSI 10-2000 Page 6 EN 1490:2000 21 - Key 1 Pressure 2, Time Figure 1 - Pressures - see Definitions 3.6.7 nomnapower rating power rating, in Table 9, to be assigned to a combined temperature
38、 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 selection of materials is the responsibility of ,e manufacturer, provided they satis the following requirements: a) materials and coatings shall
39、 not contaminate the drinking water, when in normal or accidental contact; b) in a technical document, the manufacturer shall state the nature of the materials and coatings used; c) material with inadequate corrosion resistance shall have additional protection; and d) the materials used shall not de
40、teriorate 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. Q BSI 10-2000 STD-BSI BS EN 1490-EN
41、GL ZOO0 = Lb24bb9 0876253 170 Page 7 EN 1490:2000 Table 1 - Examples of copper alloys I Material I European Standard designation Reference number EN 1982 Copper-zinc alloys containing more than 10 % zinc are subject to dezincification when submitted to water capable of dezincification. In the countr
42、ies where the use of products made of dezincification resistant materials is required, the products have to guarantee a dezincification depth less than 200 pm in any direction; they have to be tested in accordance with the standard EN IS0 6509 and have to be marked in compliance with the indications
43、 under section 1 1. 5 DESIGN AND DIMENSIONAL REQUIREMENTS 5.1 General guidance a) The combined temperature and pressure relief valve shall be of the type where the spring is isolated fiom the water. b) All components shall be designed so as to avoid any risk of seizing, scaling or sticking. c) Slidi
44、ng or rotating parts shall not be in contact with water, 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
45、on the thermally responsive material is prevented. f) Wing or similar guides shall not be used on the inlet side of the combined temperature and pressure relief valve see Figure Zd). g) For combined temperature and pressure relief valves with threaded ends, two spanner flats shall be provided on the
46、 body. h) The normal operation of the combined temperature 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
47、 are fitted to the combined temperature and pressure relief valve disc or body, they shall be secured to prevent them fiom 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
48、 temperature and pressure relief valve with a set pressure of 0,2 MPa (2 bar) shall have a rating pressure ofPd, equal to 0,23 MPa (2,3 bar), see Figure 1. Q BSI 10-2000 STD-BSI BS EN L490-ENGL 2000 9 Lb24bb 087b254 O07 m Page 8 EN 1490:2000 5.2.1 Nominal setpressure (Pnr) The nominal set pressure s
49、hall not be greater than 1 ,O MPa (1 O bar). 5.2.2 Water tightness pressure (Pe) The water tightness pressure is related to the nominal set pressure (Pnr) by: Pe minimum = 0995 Pnr 5.2.3 Opening pressure (Po) The opening pressure Po is related to the nominal set pressure (Pnr) by: Po = 171 Pnr 5.2.4 Ratingpressure (Pdn) The rating pressure is related to the nominal set pressure (Pnr) by: Pdn = 132 Pnr 5.2.5 Closingpressure (Pf) The closing pressure is related to the nominal set pressure (Pnr) by: pi minimum = O775 Pnr 5.3 Dimensional characteristi
