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1、BRITISH STANDARD BS 1415-2: 1986 Mixing valves Part 2: Specification for thermostatic mixing valves UDC 621.646.7-555.621.5:644.6:696.117 BS 1415-2:1986 This British Standard, having been prepared under the direction of the Building Services Standards Committee, was published under the authority of
2、the Board of BSI and comes into effect on 30 June 1986 BSI 02-1999 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment 84/11771 DC ISBN 0 580 14886 6 Committees responsible for this British Standard The preparation of this British Standard wa
3、s entrusted by the Building Services Standards Committee (SEB/-) to Technical Committee SEB/2 upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Appliances Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) Associat
4、ion of Water Officers Ltd. British Bath Manufacturers Association British Gas Corporation British Non-ferrous Metals Federation British Plastics Federation British Valve Manufacturers Association Ltd. Builders Merchants Federation Consumer Standards Advisory Committee of BSI Copper Tube Fittings Man
5、ufacturers Association Council of British Ceramic Sanitaryware Manufacturers Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Department of the Environment (Water Directorate) Department of Trade and Industry (National Weights a
6、nd Measures Laboratory) Institute of Clerks of Works of Great Britain Inc. Institute of Plumbing Institution of Gas Engineers Institution of Public Health Engineers Institution of Water Engineers and Scientists Metal Sink Manufacturers Association National Association of Plumbing, Heating and Mechan
7、ical Services Contractors National Brassfoundry Association Royal Institute of British Architects Society of British Gas Industries South London Consortium Water Authorities Association Water Companies Association Amendments issued since publication Amd. No.Date of issueComments BS 1415-2:1986 BSI 0
8、2-1999i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1Scope1 2Definitions1 3Nominal size1 4Marking1 Section 2. Materials, design and construction 5Materials2 6Castings2 7Hot-pressings2 8Connections3 9Plating3 10Method of operation3 Section 3. Performance 11Ge
9、neral4 12Flow rate test4 13Valve seat and body upstream tests4 14Body downstream tests4 15Hydraulic strength test4 16“O” ring pneumatic test4 17Sensitivity of temperature control4 18Temperature stability of blend water under changing inlet pressure conditions4 19Temperature stability of blend water
10、under changing temperature conditions4 20Thermal shut-off (cold water failure)5 21Temperature stability of blend water at reduced flow rates (for valves designed for multi-outlet installations only)5 22Devices to prevent cross tracking intercommunications of supply systems5 Appendix A Method of test
11、 for the determination of the rate of flow6 Appendix B Method of test for the determination of sensitivity of temperature control10 Appendix C Method of test for the determination of blend water temperature stability under changing inlet pressure conditions10 Appendix D Method of test for the determ
12、ination of blend water temperature stability under changing inlet temperature conditions10 Appendix E Method of test for determining the thermal shut-off of mixing valves when cold water inlet supply fails11 Appendix F Method of test for temperature stability of blend water at reduced flow rates11 A
13、ppendix G Method of test for the determination of resistance to cross tracking12 Figure 1 Blended water temperature test apparatus7 Figure 2 Details of pressure take-off tee8 Figure 3 Thermometer tee arrangement9 Figure 4 Suggested thermometer housing details9 BS 1415-2:1986 ii BSI 02-1999 Page Tabl
14、e 1 Minimum flow rate in litres per second4 Table 2 Blend water temperature variations (changing inlet pressure)5 Table 3 Blend water temperature variations (changing temperature)5 Table 4 Outlet flow under cold water failure5 Table 5 Blend water temperature at reduced flow rates5 Table 6 Dimensions
15、 of pressure take-off tee8 Publications referred to Inside back cover BS 1415-2:1986 BSI 02-1999iii Foreword This Part of BS 1415 has been prepared under the direction of the Building Services Standards Committee, and provides basic requirements to ensure that thermostatic mixing valves operate sati
16、sfactorily. It also provides certain essential safeguards in their use. This Part of BS 1415 deals only with mixing valves of the thermostatic type. Mixing valves of the manually operated type are dealt with in BS 1415-1. Terminal fittings fed by the mixing valve, e.g. shower rose or nozzle, have an
17、 important effect upon the performance of the installation and will usually govern the size of mixing valve to be used. Purchasers are advised to provide manufacturers with the fullest information regarding the operating conditions so that the most appropriate designs may be offered for any particul
18、ar application. Attention is drawn to the recommendations of the following British Standard codes of practice: a) clause 320 a) of CP 310:1965, which states that the connection of the feed pipe (or the cistern) to the cylinder should be not less than 12 mm ( in) higher than the connection for the co
19、ld water draw-off pipe; and b) clause 3 of CP 342-1:1970, which recommends that, in general, the temperature of the stored water should not exceed 65 C and that a stored water temperature of 60 C is considered sufficient to meet all normal requirements. A British Standard does not purport to include
20、 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 pages This document comprises a front cover, an inside front cover, pages i
21、to iv, pages 1 to 12, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover. iv blank BS 1415-2:1986 BSI 02-19991 Section 1. General 1 Scope This Par
22、t of BS 1415 specifies the requirements for performance and materials of size and size thermostatic mixing valves, in six series, for ablutionary and domestic purposes. Such mixing valves are suitable for use with inlet supply pressures of up to 6 bar1) and inlet water temperatures between 10 C and
23、72 C. NOTEThe titles of the publications referred to in this standard are listed on inside back cover. 2 Definitions For the purposes of this Part of BS 1415, the following definitions apply. 2.1 single sequential control mixing valve a fitting into which supplies of hot and cold water enter through
24、 separate valve ports, are mixed in a specially formed chamber and thence delivered through one or more outlets, the temperature of the mixed water being governed through a nominal range in a predetermined sequence by the manual operation of a single control, which may also have a shut-off feature 2
25、.2 twin (or dual) control mixing valve a fitting into which supplies of hot and cold water enter through separate valve ports, are mixed in a specially formed chamber and thence delivered through one or more outlets, the temperature of the mixed water being governed independently by the manual opera
26、tion of one of the controls, and the volume/shut-off being independently governed by the manual operation of the other control 2.3 single control/twin (or dual) function mixing valve a fitting into which supplies of hot and cold water enter through separate valve ports, are mixed in a specially form
27、ed chamber and thence delivered through one or more outlets, the temperature of the mixed water being governed independently by the manual operation of the single control in one mode, and the volume/shut-off being independently governed by the manual operation of the same control in an alternative m
28、ode 3 Nominal size The size of mixing valves shall be specified by means of the nominal size of the inlet connections, i.e. size or size . 4 Marking 4.1 Permanent marking for all mixing valves All mixing valves shall be permanently and legibly marked (for example by etching or stamping) with the fol
29、lowing information: a) the manufacturers name or identification mark; b) the number and date of this British Standard including the series number, e.g. BS 1415-2/60:19862) (see clause 12). 4.2 Additional marking for mixing valves with a non-interchangeable inlet Mixing valves with a non-interchangea
30、ble inlet, shall be permanently and legibly marked with the following identification. Either: a) the letter “H” on the hot water inlet and the letter “C” on the cold water inlet; or b) the colour red on the hot water inlet and the colour blue on the cold water inlet. 1) 1 bar = 105 N/m2 = 100 kPa. 2
31、) Marking BS 1415-2/60:1986 on or in relation to a product is a claim by the manufacturer that the product has been manufactured to the requirements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party cer
32、tification should be addressed to the appropriate certification body. BS 1415-2:1986 2 BSI 02-1999 Section 2. Materials, design and construction 5 Materials 5.1 General The body of mixing valves shall be of brass, gunmetal or stainless steel as specified in 5.2. Components in contact with the water
33、(e.g. valve units) shall be made from copper alloy, stainless steel, ceramic material polished to 0.0006 mm or, if readily replaceable, from engineering polymers as specified in 9.4 of BS 5412 and BS 5413-5:1976. When used under the conditions for which they are designed, non-metallic materials in c
34、ontact with or likely to come into contact with potable water shall not constitute a toxic hazard, shall not support microbial growth and shall not give rise to unpleasant taste or odour, cloudiness or discoloration of the water. Concentrations of substances, chemicals and biological agents leached
35、from materials in contact with potable water, and measurements of the relevant organoleptic/physical parameters, shall not exceed the maximum recommended by the World Health Organization in its publication “Guidelines for drinking water quality”, Vol. 1 “Recommendations” (WHO Geneva, 1984) or as req
36、uired by the EEC Council Directive of 15 July 1980 relating to the quality of water intended for human consumption (Official Journal of the European Communities, L229, 11-29), whichever in each case is the more stringent. NOTE 1Requirements for the testing of non-metallic materials in these respects
37、 are set out in the UK Water Fittings Byelaws Scheme Information and Guidance Note No. 5-01-02 ISSN 0267 0313, obtainable from the Water Research Centre, Water Byelaws Advisory Service, 660 Ajax Avenue, Slough, Berkshire SL1 4BG. NOTE 2Pending the determination of suitable means of characterising th
38、e toxicity of leachates from materials in contact with potable water, materials approved by the Department of the Environment Committee on Chemicals and Materials of Construction for use in Public Water Supply and Swimming Pools are considered free from toxic hazard for the purposes of compliance wi
39、th this subclause. A list of approved chemicals and materials is available from the Technical Secretary of that Committee at the Department of the Environment, Water Division, Romney House, 43 Marsham Street, London SW1P 2PY. NOTE 3Products manufactured for installation and use in the United Kingdom
40、 which are verified and listed under the UK Water Fitting Byelaws Scheme administered by the Water Research Centre (address as in note 1) are deemed to satisfy the requirements detailed in this clause. Components not in contact with the water (e.g handles, decorative trim, etc.) shall be made from c
41、orrosion resisting copper alloys, stainless steel or engineering polymers. 5.2 Chemical composition The chemical composition of the various materials shall be as specified in the following British Standards. a) Brass (cast), excluding diecastings, for bodies and components shall comply with grades S
42、CB1 or SCB3 of BS 1400. b) Brass gravity diecastings for bodies and components shall comply with grade DCB3 of BS 1400. c) Brass pressure diecastings for bodies and components shall comply with grade PCB1 of BS 1400. d) Gunmetal (cast) for bodies and components shall comply with grades LG1 or LG2 of
43、 BS 1400. e) Brass for hot pressings for bodies and components shall comply with grades CZ122 and CZ132 of BS 2872. f) Stainless steel for bodies shall comply with grades ANC3 or ANC4 of BS 3146-2, grades 315C16, 316C12, 316C16, 316C71, 317C16 or 318C17 of BS 3100. g) Brass rod for spindles, glands,
44、 crutches, washer plates, nuts, etc., shall comply with grades CZ121 or CZ132 of BS 2874. h) Phosphor bronze for circlips shall comply with grade PB102 of BS 2874. i) Stainless steel for circlips and components shall comply with grades 302S25, 304S15 or 303S21 of BS 970-4. j) Rubber for washers shal
45、l comply with clause 6 of BS 3457:1973. k) Toroidal sealing rings (“O” rings) shall comply dimensionally with BS 1806 or BS 4518 and also with the requirements of appendices A, B and C of BS 5412/3-5. l) Vulcanized fibre shall comply with BS 5292 and/or BS 3964 in all except electrical requirements.
46、 6 Castings All castings shall be in all respects sound and good, free from laps, blowholes and pitting and both the internal and external surfaces shall be clean, smooth, free from sand and neatly dressed. Castings shall not be burned, plugged, stopped or patched. 7 Hot-pressings All hot-pressed co
47、mponents shall be sound and solid without lamination, shall be smooth and well finished, and shall comply with BS 3885. BS 1415-2:1986 BSI 02-19993 8 Connections The threading on inlet and outlet connections shall comply with either BS 21 or BS 2779. 9 Plating Before a mixing valve is plated, non-me
48、tallic components shall be removed from the fitting unless they are of a material unaffected by the plating process. The gland packing shall be protected from the plating solution. The plating, when applied to metallic components, shall comply with service condition no. 2, classification no. Cu/Ni10
49、b Cr.r of BS 1224. The plating, when applied to non-metallic components, shall comply with service condition no. 2A, classification no. PL/Ni8b Cr.r of BS 4601. 10 Method of operation Thermostatic mixing valves shall have one of the following modes of operation. Colour coding, where used, shall be red for hot and blue for cold. a) Single sequential control mixing valve 1) off (or shut); 2) cold; 3) warm (or tepid); 4) hot. This sequence shall be clearly indicated. An arrow or other symbol shall be used to indicate increase in temperature.
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