1、BRITISH STANDARD BS6675:1986 Specification for Servicing valves (copper alloy) for water services UDC 621.646.2 77:691.73:696.117BS6675:1986 This British Standard, having been prepared under the directionof the Building ServicesStandards Committee, was published under the authorityof the Board of BS
2、Iandcomes into effect on 30 June 1986 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment 84/11772 DC ISBN 0 580 14887 4 Committees responsible for this British Standard The preparation of this British Standard was entrusted by th
3、e 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) Association of Water Off
4、icers 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 Manufacturers Assoc
5、iation Council of British Ceramic Sanitaryware Manufacturers Department of the Environment (Property Services Agency) Department of the Environment (Building Research Establishment) Department of the Environment (Water Directorate) Department of Trade and Industry (National Weights and Measures Labo
6、ratory) 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 Mechanical Services Co
7、ntractors 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 issue CommentsBS6675:1986 BSI 08-1999 i Contents
8、Page Committees responsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Materials 1 4 Lubricants for sealing rings 2 5 Marking 2 Section 2. Design requirements 6 Design and construction 3 7 Maximum working temperature and pressure 3 8 End connections 3 Section 3. Wo
9、rkmanship 9 Castings 4 10 Hot pressings 4 11 Chromium and nickel plating 4 Section 4. Test requirements 12 Hydraulic type test 5 13 Tests of sealing rings or other elastomeric type seals 5 Appendix A Method for the determination of the rate of flow 6 Appendix B Information to be supplied by the purc
10、haser 6 Figure 1 Flow rate test apparatus 7 Figure 2 Details of pressure take-off tee 8 Table 1 Flow rate 3 Table 2 Body wall thickness 3 Table 3 Maximum working temperature and pressure 3 Publications referred to Inside back coverBS6675:1986 ii BSI 08-1999 Foreword This British Standard has been pr
11、epared under the direction of the Building Services Standards Committee, and covers the design, construction and testing of copper alloy servicing valves for water services. Advice on the use of these valves will be found in BS6700 1)and attention is drawn to the proposals for new model water byelaw
12、s. 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 pages This document compris
13、es a front cover, an inside front cover, pages i and ii, pages1 to 8, 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 theinside front cover. 1) In preparation.BS6675:
14、1986 BSI 08-1999 1 Section 1. General 1 Scope This British Standard specifies requirements for materials, design, construction, workmanship and testing of copper alloy servicing valves for water services, suitable for working pressures and temperatures from16bar at up to and including30 C to5bar at
15、a maximum of120 C. Table 3 also gives interpolated values. The range of nominal sizes is10,12,15and22relating to the nominal outside diameter of copper tube in accordance with BS2871-1. This British Standard applies to the following patterns of servicing valves: a) spherical plug; b) tapered plug; c
16、) screw-down. NOTE 1For information to be supplied by the purchaser when ordering, seeAppendix B. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 servic
17、ing valve a valve intended to facilitate maintenance or servicing of a water fitting or appliance 2.2 valve size the size of the end connection of the body 3 Materials 3.1 The chemical composition of the various copper alloys and materials for component parts shall be as specified in the following B
18、ritish Standards. a) Brass (cast), excluding diecasting, for bodies and components shall comply with grade SCB1 or SCB3 of BS1400. b) Brass gravity diecastings for bodies and components shall comply with grade DCB3 of BS1400. c) Brass pressure diecastings for bodies and components shall comply with
19、grade PCB1 of BS1400. d) Gunmetal (cast) for bodies and components shall comply with grade LG1 or LG2 of BS1400. e) Brass for hot pressings for bodies and components shall comply with grade CZ121, CZ122 or CZ132 of BS2872. f) Brass rod for spindles, glands, washer plates, nuts, etc., shall comply wi
20、th grade CZ121, CZ122 or CZ132 of BS2874. g) Elastomer for washers shall consist of ethylene propylene in accordance with Table5of BS2767:1972 with the exception that the hardness requirement shall be85 5IRHD; h) Elastomer for sealing rings shall consist of ethylene propylene in accordance with Tabl
21、e5of BS2767:1972. 3.2 When used under the conditions for which they are designed, non-metallic materials in contact 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, clo
22、udiness or discoloration of the water. Concentrations of substances, chemicals and biological agents leached from materials in contact with potable water, and measurements of the relevant organoleptic/physical parameters, shall not exceed the maximum values recommended by the World Health Organizati
23、on in its publication “Guidelines for drinking water quality”, Vol.1 “Recommendations” (WHO, Geneva1984) or as required by the EEC Council Directive of15July1980 relating to the quality of water intended for human consumption (Official Journal of the European Communities, L229,11 29), whichever in e
24、ach case is the more stringent. NOTE 1Requirements for the testing of non-metallic materials in these respects are set out in the UK Water Fittings Byelaws Scheme Information and Guidance Note No.5-01-02111N0267-0313, obtainable from the Water Research Centre, Water Byelaws Advisory Service,660 Ajax
25、 Avenue, Slough, Berkshire SL1 4BG. NOTE 2Pending the determination of suitable means of characterizing the 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 Publ
26、ic Water Supply and Swimming Pools are considered free from toxic hazard for the purposes of compliance with 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 Ma
27、rsham Street, London SW1P2PY. NOTE 3Products manufactured for installation and use in the United Kingdom which are verified and listed under the UK Water Fittings Byelaws Scheme administered by the Water Research Centre (address as in note1) are deemed to satisfy the requirements detailed in this su
28、bclause.BS6675:1986 2 BSI 08-1999 4 Lubricants for sealing rings Where valves are required to be lubricated, the lubricant used shall not cause swelling or cracking of any component part. NOTEAttention is drawn to Water Authorities Association requirements in respect to materials and lubricants (see
29、3.2). 5 Marking Each valve shall be legibly and permanently marked, by stamping, etching, casting or moulding, with the following: a) the manufacturers name or identification; b) the direction of flow where necessary to aid correct installation; c) the nominal size; d) the number of this British Sta
30、ndard, i.e.BS6675 2) ; e) the symbolfor valves manufactured from CZ132 see3.1 e) and f). 2) Marking BS6675 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 ma
31、nufacturers responsibility. Enquiries as to the availability of third party certification should be addressed to the appropriate certification body.BS6675:1986 BSI 08-1999 3 Section 2. Design requirements 6 Design and construction 6.1 Minimum flow rates When tested in accordance with the method desc
32、ribed in Appendix A the flow rate shall be not less than that given inTable 1. Table 1 Flow rate 6.2 Means of operation The Valve shall be so constructed that it can be operated by means of a handwheel, a lever or via a slot in the stem 6.3 Wall thickness of body The body wall thickness shall be as
33、specified inTable 2. Table 2 Body wall thickness 7 Maximum working temperature and pressure The maximum working temperatures and pressures shall be as given inTable 3. Table 3 Maximum working temperature andpressure 8 End connections The valves shall be supplied with one of, or a combination of, the
34、 following end connections: a) compression or capillary ends in accordance with BS864-2; b) screwed ends in accordance with both clause4 and Table6 of BS864-2:1983; c) swivel ends in accordance with Table10 of BS864-2:1983. Nominal size of valve Minimum flow rate at 0.1 bar running pressure Compress
35、ion or capillary ends Screwed or swivel ends L/s 10 ! 0.05 12 ) 0.10 15 “ 0.16 22 # 0.32 Nominal size of valve Minimum wall thickness atany point Compression or capillary ends Screwed or swivel ends Hot pressings Casting mm mm 10 ! 1.1 1.1 12 ) 1.1 1.1 15 “ 1.2 1.3 22 # 1.4 1.5 Service temperature M
36、aximum hydraulic working pressure C bar 30 16 65 10 110 6 120 5BS6675:1986 4 BSI 08-1999 Section 3. Workmanship 9 Castings Cast components shall be sound and good, free from laps, blow holes and pitting. The external surfaces shall be clean and smooth. The internal surfaces shall be clean, smooth an
37、d free from sand. No cast components shall be burned, plugged, stopped or patched. 10 Hot pressings Hot-pressed components shall be sound and solid, without laminations, smooth and well finished. 11 Chromium and nickel plating When valves are to be plated, component parts which could be adversely af
38、fected by the plating process shall be removed or protected before plating. The plating shall be in accordance with service condition number2, classification number Cu/Ni10b Cr.r of BS1224.BS6675:1986 BSI 08-1999 5 Section 4. Test requirements 12 Hydraulic type test Every servicing valve shall be ca
39、pable of withstanding a hydrostatic pressure of20bar for15min when tested in accordance with a) and b) below. a) The application of an internal pressure of20bar upstream of the seating when the valve is closed, with the other side open to the atmosphere. b) The application of an internal pressure of
40、20bar when the valve is open, with the outlet port blanked off. During these tests there shall be no visible indication of leakage from the valve. 13 Tests of sealing rings or other elastomeric type seals Sealing rings and other elastomeric type seals shall comply with AppendixB of BS2494:1976.BS667
41、5:1986 6 BSI 08-1999 Appendix A Method for the determination of the rate of flow A.1 Principle The flow rate test determines whether the servicing valve under test delivers water at a minimum rate in accordance withTable 1. A.2 Apparatus A.2.1 A cold water system, consisting of a water supply which,
42、 at the running pressure specified inTable 1, is capable of delivering a quantity of water not less than50% in excess of the minimum flow rate of the servicing valve under test when the outlet of the supply pipe is open to atmosphere. A.2.2 A pressure gauge (manometer), graduated with a suitable sca
43、le and having an accuracy of 2% at the test pressure. NOTEA suitable scale is one indicating one-thousandths of a bar. A.2.3 A flow meter (or other means of measuring flow), graduated with a suitable scale and having an accuracy of 2% of the test flow rate. NOTEA suitable scale is one indicating one
44、-hundredths of a litre per second. A.2.4 A pressure take-off tee, the inlet and outlet being suitable for22mm pipe in accordance with BS2871 as shown in Figure 2. A.2.5 A 22 mm control valve, capable of regulation to achieve a0.1bar accuracy in accordance withA.3.3. A.2.6 Copper pipes, complying wit
45、h the requirements of TableX of BS2871-1:1971 to be connected to the servicing valve under test, and having the following features: a) 22 mm outside diameter copper pipe for the general construction of the rig up to the inlet connection of the pressure take-off tee. Dimension A shall be250 2mm as sh
46、own in Figure 1. b) 10 mm, 12 mm, 15 mm and 22 mm outside diameter copper pipes adapted to suit the outlet connection of the take-off tee, and the inlet of the servicing valve under test. Dimension B shall be2502mm as shown in Figure 1. c) 10 mm, 12 mm, 15 mm and 22 mm outside diameter copper pipes
47、adapted to suit the outlet connection of the servicing valve under test. Dimension C shall be250 2mm horizontal and1202mm vertical as shown in Figure 1. A.3 Procedure A.3.1 Connect the test circuit, as shown in Figure 1, to the cold water supply. A.3.2 Connect the servicing valve to be tested to the
48、 test apparatus as shown in Figure 1. A.3.3 Open the servicing valve to the fullest extent and adjust the water supply so that the pressure gauge (manometer) indicates the required0.1bar running pressure. Appendix B Information to be supplied by the purchaser When enquiring about or ordering servici
49、ng valves that comply with this British Standard, the purchaser should provide the manufacturer with the following information: a) the nominal size; b) the required end connection(s); c) whether dezincification resistant valves are required see3.1 e) andf) and clause5; d) the means of operation of the valve (see6.2); e) whether the valve is required to be plated (seeclause11).BS6675:1986 BSI 08-1999 7 NOTE 1The lettered references are explained in A.2.6. NOTE 2For details of the pressure take-off tee see Figure 2. NOTE 3Figure is diagr
