1、BRITISH STANDARD BS5433:1976 Incorporating Amendment Nos.1 and2 Specification for Underground stopvalves for water services UDC696.117:621.646.651 CONFIRMED DECEMBER 2007BS5433:1976 This British Standard, having been prepared under the direction of the Sanitary Appliances Standards Committee,was pub
2、lished underthe authority of the Executive Board on 30 November1976 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment73/13411DC ISBN 0 580 09630 0 Cooperating organizations The Sanitary Appliances Standards Committee, under whos
3、e supervision this British Standard was prepared, consists of representatives from the following Government departments and scientific and industrial organizations: British Bath Manufacturers Association* Institution of Public Health Engineers British Plastics Federation* Metal Sink Manufacturers As
4、sociation Council of British Ceramic Sanitaryware Ministry of Defence Manufacturers* National Brassfoundry Association* Department of the Environment* National Federation of Builders and Environmental Health Officers Association Plumbers Merchants* Greater London Council* National Water Council* Ins
5、titute of Plumbing* Royal Institute of British Architects Institution of Heating and Ventilating Royal Institute of Public Health and Hygiene Engineers* Royal Society of Health* Institution of Municipal Engineers* Water Companies Association* The Government department and scientific and industrial o
6、rganizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of this British Standard: Association of Manufacturers of Domestic Heating and Ventilating Contractors Electrical Appliances Association Brit
7、ish Gas Corporation Institute of British Foundrymen British Non-ferrous Metals Technology Institution of Gas Engineers Centre Institution of Water Engineers and British Valve Manufacturers Association Scientists Copper Ball Manufacturers Association National Association of Plumbing, Heating Copper D
8、evelopment Association and Mechanical Services Contractors Copper Tube Fittings Manufacturers Society of British Gas Industries Association South London Consortium Department of the Environment, Building Thames Water AuthorityMetropolitan Research Establishment Water Division Department of Prices an
9、d Consumer Individual experts Protection Amendments issued since publication Amd. No. Date of issue Comments 3570 December 1981 4596 September 1984 Indicated by a sideline in the marginBS5433:1976 BSI 08-1999 i Contents Page Cooperating organizations Inside front cover Foreword iii Section 1. Genera
10、l 1 Scope 1 2 References 1 3 Definitions 1 4 Illustrations 1 5 Nominal size 1 6 Marking 1 Section 2. Dimensions, testing and materials 7 Dimensions 1 8 Testing 1 9 Materials 1 Section 3. Workmanship 10 Castings 3 11 Forgings 3 12 Machining 3 13 Thickness of parts 3 Section 4. Design and construction
11、 14 Waterway 3 15 Seat 4 16 Screw threads 4 17 Head seal 4 18 Washer plate 4 19 Bodies and heads 5 20 Method of attaching crutch or square head 5 21 Clearance between crutch and stuffing box 5 22 Joint washers 5 23 Seat washers 5 24 Glands and gland packings 5 25 Union connections 5 26 Hexagonal sho
12、ulders 6 Figure 1 Underground stopvalve 3 Figure 2 Dimensions of underground stopvalve bodies 8 Figure 3 Dimensions of heads and glands 10 Figure 4 Square heads 13 Figure 5 Dimensions of crutches, spindles, washers and washer plates 14 Figure 6 Dimensions of ends, tail pipes and nuts 18 Table 1 Mate
13、rials 2 Table 2 Head seal features 5 Table 3 Dimensions of underground stopvalve bodies 7 Table 4 Dimensions of heads and glands 9 Table 5 Dimensions of square heads, crutches, spindles washers and washerplates 11 Table 6 BS Whitworth threads (external) on spindles for engagementwithhead threads (in
14、ternal) limits and tolerances: free class 15 Table 7 BS Whitworth threads (internal) on heads for engagement withspindle threads (external) limits and tolerances: normal class 15BS5433:1976 ii BSI 08-1999 Page Table 8 BS Whitworth form screw threads (external) onheads for engagement with body thread
15、s (internal) limitsand tolerances: medium class 15 Table 9 BS Whitworth form screw threads (internal) on bodies for engagement with head threads (external) limits and tolerances: medium class 16 Table 10 BS Whitworth form screw threads (external) on glands for engagement with stuffing box threads (i
16、nternal) limits and tolerances: medium class 16 Table 11 BS Whitworth form screw threads (internal) instuffing box for engagement with gland threads (external) limitsand tolerances: medium class 16 Table 12 Parallel spigot and cone end tail pipes for underground stopvalves 17 Publications referred t
17、o Inside back coverBS5433:1976 BSI 08-1999 iii Foreword This British Standard has been prepared under the authority of the Sanitary Appliances Standards Committee. The original idea for a British Standard for special stopvalves arose from a proposal by the then British Waterworks Association (now Na
18、tional Water Council) who had carried out an investigation among their members into the use and behaviour of valves based on BS1010:1959 when used underground. Experience of the exacting conditions and lack of accessibility in situations where they were installed led to the recommendation for a stro
19、nger valve with special design features to match the operating conditions. The dimensions given are those considered necessary to ensure the production of valves of nominal size“ to2 suitable for underground water services. It is recommended that the body of the valve and the metal components be bas
20、ed on gunmetals and bronzes for strength and that attention be given to resistance against dezincification. There is provision for alternative methods of operation by means of either a crutch-type handle or a square top. Provision is made for minimum opening torque so as to prevent the possibility o
21、f the head screwing out of the body when the stopvalve is being opened or turned with a key. BS1010:1959 has been retained and retitled “Part 1: Imperial units”. Above-ground stopvalves are now included in the metric version BS1010-2:1973. In this standard, dimensions are expressed in metric terms e
22、xcept that pipe thread designations accord with BS2779. Requirements for methods of testing suitability of materials for use in contact with water for domestic purposes will form the subject of a separate standard to be prepared under the direction of the Environment and Pollution Standards Committe
23、e (EPC/-). 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
24、 comprises a front cover, an inside front cover, pagesi to iv, pages1 to18, 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 blankBS5433:1976
25、 BSI 08-1999 1 Section 1. General 1 Scope This British Standard applies to copper alloy screwdown stopvalves of nominal sizes from“ to2 for installation on underground water service pipes. The nominal size is that corresponding to the pipe size of the thread at the end connection. It includes stopva
26、lves with ends screwed internally or externally or arranged in accordance with clause25, and fitted with a crutch or with a square head. 2 References The titles of the publications referred to in this standard are listed on the inside back cover. 3 Definition For the purpose of this British Standard
27、 the following definition applies, together with any which are relevant in BS2591-1. screwdown stopvalves any valve in which a disc carrying a renewable non-metallic washer is lifted from and lowered onto the body seat by a spindle whose axis is perpendicular to the face of the body seat and having
28、suitable means of connection for insertion in a pipeline. The use of the word valve or stopvalve herein shall be taken to mean an underground stopvalve 4 Illustrations Illustrations of typical stopvalves showing the component parts are given in Figure 1 to Figure 6. These illustrations are not inten
29、ded to indicate design. 5 Nominal size Stopvalves shall be designated by their nominal sizes; their dimensions shall be as specified in Table 3 to Table 12. 6 Marking Stopvalves shall be legibly and permanently marked with the following information. On the headwork and body: a) manufacturers name or
30、 mark; b) the number of this British Standard, i.e.BS5433. On the body: c) nominal size; d) direction of flow. Section 2. Dimensions, testing and materials 7 Dimensions Dimensions for screw threads shall comply with those specified in Table 6 to Table 11. Other dimensions for valve bodies and compon
31、ents shall be as specified in Table 3, Table 4 and Table 5. Dimensions for parallel spigot and cone end tail pipes shall be as specified in Table 12. 8 Testing Every stopvalve shall be tested in the assembled condition both in the fully closed position (seat test) and in the fully open position (bod
32、y test). In both cases the test shall consist of either a hydraulic test at not less than21bar 1)or a pneumatic test at not less than5bar while the stopvalve is completely immersed in water. Alternatively, the body test may be carried out with the valve reversed and in the closed position. The valve
33、 being tested shall neither leak nor sweat during tests. 9 Materials 9.1 Composition. The preferred metallic materials for the component parts of underground stopvalves are those listed in Table 1. 9.2 Alternative materials. Other metallic materials may be used provided that they are not less suitab
34、le than those listed in Table 1, not more susceptible to corrosion, completely immune to dezincification and are not of lower mechanical strength. 9.3 Materials in contact with supply water. The materials which are in contact with supply water, including “O”-rings, gland packings, seat washers and l
35、ubricants used in the construction, shall not constitute a toxic hazard and shall not foster microbiological growth or give rise to taste, odour, cloudiness or discoloration of the water. Attention is drawn to National Water Council requirements in this respect. 1) 1bar= 10 5 N/m 2 =100kPa.BS5433:19
36、76 2 BSI 08-1999 Table 1 Materials 1 2 3 4 5 6 7 8 9 2 Basic material form Sand castings Non-forging stock Forging stock 3 Stopvalve component parts Material specification BS 1452 grade 12 Cast iron BS 1400 LG1 Gunmetal BS 1400 LG2 Gunmetal BS 1400 LG4 Gunmetal BS 1400 LG2 Continuous cast gunmetal B
37、S 2874 PB 102 Phosphor bronze BS 2872 CA 104 Aluminium bronze 4 Body X X X 5 Head X X X X X X 6 Gland nominal size“ and# only X X X 7 nominal size1 and over X X X X X X 8 Spindle nominal size“ and# only X X X X 9 nominal size1 and over X X X X X 10 Crutch X X X X X 11 Washer plate X X X X X X 12 Nut
38、 X X X 13 Square head X X X X X X X 14 Union nuts, compression nuts and tail pipes X X X X X X 15 Seating washer Vulcanized synthetic rubber complying with the requirements of clause6 of BS3457:1973 16 Head seal “O”-ring Rubber complying with the requirements of BS2494 17 Gland packing See clause24
39、18 Pinning wire for square head BS2874, CZ121 or CZ122BS5433:1976 BSI 08-1999 3 Section 3. Workmanship 10 Castings Castings shall be in all respects sound and good, free from laps, blow holes and pitting, and both the external and internal surfaces shall be clean, smooth and free from sand. They sha
40、ll be neatly dressed and no casting shall be burned, plugged, stopped or patched. 11 Forgings All forged components shall be sound, solid without laminations, smooth and well finished and shall comply with the requirements of BS3885. 12 Machining The bodies, heads, spindles and other parts shall be
41、truly machined so that, when assembled, the parts are axial and parallel with surfaces smoothly finished with the limits of the size given in the tables applicable to the various components. 13 Thickness of parts Except where there are definite dimensions given which provide for a lesser thickness,
42、no part of any component of a valve shall be of less thickness than that shown in Table 3, line4. Minimum thicknesses for unions are given in Table 12; see also clause25. Section 4. Design and construction 14 Waterway Except where otherwise stated, the area of waterway throughout the body of a valve
43、 shall be not less than the area of a circle of diameter equal to the bore of the seating. The dimensions of the waterway through the unions of a valve shall be not less than those stated in Table 12 for the purposes specified in the table, or alternatively if the union ends are for copper tube the
44、dimensions shall be not less than is specified for the appropriate size of union in BS864-2. Figure 1 Underground stopvalveBS5433:1976 4 BSI 08-1999 15 Seat The seat of a valve shall be flat and solid with the body and shall fully support the washer. The bore of the seat shall be rounded to a radius
45、 of not less than0.5mm and not more than0.8mm. The minimum thickness of metal supporting the seat shall be as given in Table 3, line3. 16 Screw threads 16.1 General. Unless otherwise specified, all threads shall be of Whitworth or metric form and right-handed. The external thread on spindles and the
46、 corresponding internal thread in heads shall be as detailed in Table 6 and Table 7. All special threads on component parts shall be made to the diameters and pitches specified in Table 6 to Table 11 of this standard and shall comply with the requirements of BS84 so far as it is applicable. 16.2 Inl
47、et and outlet. Except where otherwise specified in this standard, inlets and outlets of valves shall: a) for a pipe thread of the same nominal size as the valve, either: 1) comply with the requirements of class B of Table 3M or Table 3 of BS2779:1973, for external threads; or 2) comply with the requ
48、irements of Table 4M or Table 4 of BS2779:1973, for internal threads; or b) for union ends, comply with the dimensions specified in Table 12; or c) either: 1) be tapped or screwed (taper pipe thread) to comply with the requirements of BS21; or 2) be tapped or screwed to comply with the requirements
49、of BS61; or 3) comply with the requirements of clause25. 16.3 Spindle thread. The length of the spindle thread shall be such that, when the washer plate is resting on the seating without any washer, a length of the thread equal to not less than70% of the external diameter of the threaded portion of the spindle shall be in full engagement with the internal thread of the head. 16.4 Head thread. The spindle thread in the head (internal) shall be so formed that when the spindle is screwed into the head to its fully open position,
