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1、BRITISH STANDARD BS 6282-4: 1982 Devices with moving parts for the prevention of contamination of water by backflow Part 4: Specification for combined check and anti-vacuum valves of nominal size up to and including DN 42 UDC 621.646.248 Licensed Copy: London South Bank University, London South Bank
2、 University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4:1982 This British Standard, having been prepared under the direction of the Building Services Standards Committee, was published under the authority of the Board of BSI and comes into effect on 30 November 1982 BSI
3、 09-1999 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment 79/10570 DC ISBN 0 580 12918 7 Cooperating organizations The Building Services Standards Committee, under whose direction this British Standard was prepared, consists of representat
4、ives from the following: Association of District CouncilsGreater London Council Bath Manufacturers Co-ordinating CommitteeHeating and Ventilating Contractors British Gas Corporation*Association British Ironfounders AssociationIncorporated Association of Architects and British Plastics Federation*Sur
5、veyors British Plumbing Employers CouncilInstitute of Plumbing* British Precast Concrete Federation Ltd.Institution of Environmental Health Officers Builders Merchants Federation*Institution of Gas Engineers* Building Services Research and Information Institution of Municipal Engineers AssociationIn
6、stitution of Public Health Engineers* Chartered Institution of Building ServicesInstitution of Water Engineers and Scientists* Clay Pipe Development Association LimitedLocal Authorities Organization Consumer Standards Advisory Committee of Metal Sink Manufacturers Association* BSI*National Brassfoun
7、dry Association* Convention of Scottish Local AuthoritiesNational Coal Board Council of British Ceramic Sanitaryware National Federation of Building Trades Manufacturers*Employers Department of Health and Social SecurityNational Water Council* Department of the Environment (PSA)*Royal Institute of B
8、ritish Architects* Department of the Environment (Building Royal Institution of Chartered Surveyors Research Establishment)*Royal Society of Health Department of the Environment (Water Scottish Development Department Directorate)*Trades Union Congress Department of the Environment (Housing and Water
9、 Companies Association* Construction) Domestic Solid Fuel Appliances Approval Scheme The organizations marked with an asterisk in the above list, together with the following, were directly represented on the Technical Committee entrusted with the preparation of this British Standard: Association of
10、Manufacturers of Domestic Design Council Electrical AppliancesInstitute of Clerks of Works of Great Britain Inc. Association of Manufacturers of Domestic National Association of Plumbing, Heating and Unvented Supply Systems EquipmentMechanical Services Contractors Association of Water Officers Ltd.P
11、lastic Bath Manufacturers Association British Bath Manufacturers AssociationSociety of British Gas Industries British Valve Manufacturers Association Ltd.South London Consortium Copper Tube Fittings Manufacturers Thames Water Authority (Metropolitan Water AssociationDivision) Department of Trade (Me
12、trology, QualityWater Research Centre Assurance, Safety and Standards Division) Amendments issued since publication Amd. No.Date of issueComments Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4:1982 B
13、SI 09-1999i Contents Page Cooperating organizationsInside front cover Forewordii Section 1. General 1Scope1 2Definitions1 3Nominal size1 4Marking1 Section 2. Materials and design 5Materials1 6End connections1 7Air inlet apertures1 Section 3. Performance 8Component tests2 Section 4. Instructions 9Ins
14、tructions for installation and use2 Table 1 Nominal size2 Publications referred toInside back cover Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4:1982 ii BSI 09-1999 Foreword This Part of BS 6282 ha
15、s been prepared under the direction of the Building Services Standards Committee at the request of the Department of the Environment on the advice of the Standing Technical Committee on Water Regulations. It is one of a series of standards (BS 6280 to BS 6282) that specify the requirements for parti
16、cular devices for preventing backsiphonage and backflow of water in installations and is intended to be suitable for citing as deemed to satisfy the relevant regulations or byelaws. BS 6282 has been divided into the following Parts: Part 1: Specification for check valves of nominal size up to and in
17、cluding DN 54; Part 2: Specification for terminal anti-vacuum valves of nominal size up to and including DN 54; Part 3: Specification for in-line anti-vacuum valves of nominal size up to and including DN 42; Part 4: Specification for combined check and anti-vacuum valves of nominal size up to and in
18、cluding DN 42. This standard is based on experimental work carried out by the Building Research Establishment. 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
19、h 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 and ii, pages 1 and 2, an inside back cover and a back cover. This standard has been updated (see copyright date) and may have had amendments i
20、ncorporated. This will be indicated in the amendment table on the inside front cover. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4:1982 BSI 09-19991 Section 1. General 1 Scope This Part of BS 6282
21、specifies the characteristics of combined check and anti-vacuum valves of nominal size up to and including DN 42 that are suitable for use at pressures up to and including 10 bar1) and temperatures up to and including 90 C. NOTEThe titles of the publications referred to in this Part of BS 6282 are l
22、isted on the inside back cover. 2 Definitions For the purposes of this Part of BS 6282 the following definitions apply. 2.1 combined check and anti-vacuum valve a device consisting of a check valve and an anti-vacuum valve in one unit that, when fitted into a water pipe, has the function of limiting
23、 vacuum pressures in an installation and preventing backsiphonage into a drinking water system 2.2 fouling thread a nylon thread of 0.7 mm diameter used to impede the closure of a valve obturator 3 Nominal size The nominal size of the combined check and anti-vacuum valve corresponding to the appropr
24、iate size of inlet connection shall be assigned as given in Table 1. 4 Marking 4.1 Flow marking. Each combined check and anti-vacuum valve shall be legibly and permanently marked to identify the direction of flow. This marking shall be stamped, etched, cast or moulded on the valve. 4.2 Identificatio
25、n marking. Each combined check and anti-vacuum valve shall be legibly and permanently marked with the following: a) the number of this British Standard, i.e. BS 6282-42); b) the manufacturers or agents name, trade mark or symbol; c) the nominal size. NOTEAdhesive labels are not considered to be perm
26、anent for the purposes of this standard. Section 2. Materials and design 5 Materials Materials shall comply with clause 9 of BS 5412 & BS 5413-5:1976. Copper alloy materials that are in contact with water shall also comply with clause 12 of BS 2872:1969. Any non-metallic materials shall not, under t
27、he expected usual conditions of use for which the unit is designed, impart to the water with which they will come into contact, unpleasant taste or odour, any cloudiness or discoloration, or any toxic or undesirable substances. NOTEFor further information, see the National Water Council publication
28、“Requirements for the testing of non-metallic materials for use in contact with potable water” obtainable from the National Water Council, Fittings Testing and Standards Unit, Fittings Testing Station, 660 Ajax Avenue, Slough, Berks, SL1 4BG. 6 End connections 6.1 General. End connections shall be s
29、crewed ends, compression ends or flanged ends complying with 6.2, 6.3 or 6.4. 6.2 Screwed ends. Where the ends of a combined check and anti-vacuum valve are screwed, the threads shall be parallel pipe threads complying with BS 2779 for internal threads or class B of BS 2779 for external threads. Scr
30、ewed end connections shall be designed so that when a pipe or fitting is screwed into the threaded portion of the valve body it shall not reduce the area of waterway of the valve, distort any portion of the valve body or adversely affect the operation of the valve. 6.3 Compression ends. Where compre
31、ssion end connections are provided, they shall comply with BS 864-2 or BS 864-3. 6.4 Flanged ends. Where flanged end connections are provided, they shall comply with BS 4504-2. 7 Air inlet apertures The air inlet apertures shall be open and clear but shrouded to prevent direct access. They shall be
32、of a size capable of accepting a pin gauge of 3 mm diameter. 1) 1 bar = 105 N/m2 = 100 kPa. All pressures are gauge pressures unless otherwise stated. 2) Marking BS 6282-4 on or in relation to a product is a claim by the manufacturer that the product has been manufactured in accordance with the requ
33、irements of the standard. The accuracy of such a claim is therefore solely the manufacturers responsibility. Enquiries as to the availability of third party certification to support such claims should be addressed to the Director, Quality Assurance Division, BSI, Maylands Avenue, Hemel Hempstead, He
34、rts HP2 4SQ in the case of certification marks administered by BSI or to the appropriate authority for other certification marks. Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4:1982 2 BSI 09-1999 Sec
35、tion 3. Performance 8 Component tests The two component parts of combined check and anti-vacuum valves shall be capable of complying with the following. a) The check valve component shall be tested with the anti-vacuum valve component sealed or locked in the closed position and shall comply with cla
36、uses 7 to 16 of Part 1:1982 of this standard. b) The anti-vacuum valve component shall be tested with a fouling thread placed completely through the waterway of the device during the test and shall comply with clauses 8 to 14 of Part 3:1982 of this standard. Section 4. Instructions 9 Instructions fo
37、r installation and use The manufacturer shall provide with each valve all the necessary information for its correct installation and use. Table 1 Nominal size Nominal size of combined check and anti-vacuum valve Nominal size of inlet connection Screwed (complying with BS 2779) Compression Flanged (c
38、omplying with BS 4504-2) (complying with BS 864-2) (complying with BS 864-3) DN 10 12 15 18 22 28 35 42 G) G) G“ G# G# G1 G1! G1“ 12 15 18 22 28 35 42 ) “ # # 1 1! 1“ 10 15 20 25 32 40 Licensed Copy: London South Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Unco
39、ntrolled Copy, (c) BSI BS 6282-4:1982 BSI 09-1999 Publications referred to BS 864, Capillary and compression tube fittings of copper and copper alloy. BS 864-2, Metric units. BS 864-3, Compression fittings for polyethylene pipes. BS 2779, Pipe threads where pressure-tight joints are not made on the
40、threads. BS 2872, Copper and copper alloys. Forging stocks and forging. BS 4504, Flanges and bolting for pipes, valves and fillings. Metric series. BS 4504-2, Copper alloy and composite flanges. BS 5412 & BS 5413, Specification for the performance of draw-off taps with metal bodies for water service
41、s Specification for the performance of draw-off taps with plastics bodies for water services Part 5 Physio-chemical characteristics: materials, coatings. BS 6280, Method of vacuum (backsiphonage) test for water-using appliances3). BS 6281, Devices without moving parts for the prevention of contamina
42、tion of water by backflow3). BS 6282, Devices with moving parts for the prevention of contamination of water by backflow. BS 6282-1, Specification for check valves of nominal size up to and including DN 54. BS 6282-2, Specification for terminal anti-vacuum valves of nominal size up to and including
43、DN 54. BS 6282-3, Specification for in-line anti-vacuum valves of nominal size up to and including DN 42. Requirements for the testing of non-metallic materials for use in contact with potable water (published by the National Water Council). 3) Referred to in foreword only. Licensed Copy: London Sou
44、th Bank University, London South Bank University, Thu Dec 07 06:40:26 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS 6282-4: 1982 BSI 389 Chiswick High Road London W4 4AL BSI British Standards Institution BSI is the independent national body responsible for preparing British Standards. It presents th
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