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1、BRITISH STANDARD BS 5433:1976 Incorporating Amendment Nos. 1 and 2 Specification for Underground stopvalves for water services UDC 696.117:621.646.651 CONFIRMED DECEMBER 2007 BS 5433:1976 This British Standard, having been prepared under the direction of the Sanitary Appliances Standards Committee,
2、was published under the authority of the Executive Board on 30 November 1976 BSI 08-1999 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment 73/13411DC ISBN 0 580 09630 0 Cooperating organizations The Sanitary Appliances Standards Committee,
3、under whose 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 Manufact
4、urers Association Council of British Ceramic SanitarywareMinistry of Defence Manufacturers*National Brassfoundry Association* Department of the Environment*National Federation of Builders and Environmental Health Officers AssociationPlumbers Merchants* Greater London Council*National Water Council*
5、Institute of Plumbing*Royal Institute of British Architects Institution of Heating and VentilatingRoyal 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 DomesticHeating and Ventilating Contractors Electrical AppliancesAssociation Britis
7、h Gas CorporationInstitute of British Foundrymen British Non-ferrous Metals TechnologyInstitution of Gas Engineers CentreInstitution of Water Engineers and British Valve Manufacturers AssociationScientists Copper Ball Manufacturers AssociationNational Association of Plumbing, Heating Copper Developm
8、ent Associationand Mechanical Services Contractors Copper Tube Fittings ManufacturersSociety of British Gas Industries AssociationSouth London Consortium Department of the Environment, BuildingThames Water Authority Metropolitan Research EstablishmentWater Division Department of Prices and ConsumerI
9、ndividual experts Protection Amendments issued since publication Amd. No.Date of issueComments 3570December 1981 4596September 1984Indicated by a sideline in the margin BS 5433:1976 BSI 08-1999i Contents Page Cooperating organizationsInside front cover Forewordiii Section 1. General 1Scope1 2Referen
10、ces1 3Definitions1 4Illustrations1 5Nominal size1 6 Marking1 Section 2. Dimensions, testing and materials 7Dimensions1 8Testing1 9Materials1 Section 3. Workmanship 10Castings3 11Forgings3 12Machining3 13Thickness of parts3 Section 4. Design and construction 14Waterway3 15Seat4 16Screw threads4 17Hea
11、d seal4 18Washer plate4 19Bodies and heads5 20Method of attaching crutch or square head5 21Clearance between crutch and stuffing box5 22Joint washers5 23Seat washers5 24Glands and gland packings5 25Union connections5 26Hexagonal shoulders6 Figure 1 Underground stopvalve3 Figure 2 Dimensions of under
12、ground stopvalve bodies8 Figure 3 Dimensions of heads and glands10 Figure 4 Square heads13 Figure 5 Dimensions of crutches, spindles, washers and washer plates14 Figure 6 Dimensions of ends, tail pipes and nuts18 Table 1 Materials2 Table 2 Head seal features5 Table 3 Dimensions of underground stopva
13、lve bodies7 Table 4 Dimensions of heads and glands9 Table 5 Dimensions of square heads, crutches, spindles washers and washer plates11 Table 6 BS Whitworth threads (external) on spindles for engagement with head threads (internal) limits and tolerances: free class15 Table 7 BS Whitworth threads (int
14、ernal) on heads for engagement with spindle threads (external) limits and tolerances: normal class15 BS 5433:1976 ii BSI 08-1999 Page Table 8 BS Whitworth form screw threads (external) on heads for engagement with body threads (internal) limits and tolerances: medium class15 Table 9 BS Whitworth for
15、m screw threads (internal) on bodies for engagement with head threads (external) limits and tolerances: medium class16 Table 10 BS Whitworth form screw threads (external) on glands for engagement with stuffing box threads (internal) limits and tolerances: medium class16 Table 11 BS Whitworth form sc
16、rew threads (internal) in stuffing box for engagement with gland threads (external) limits and tolerances: medium class16 Table 12 Parallel spigot and cone end tail pipes for underground stopvalves17 Publications referred toInside back cover BS 5433:1976 BSI 08-1999iii Foreword This British Standard
17、 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 National Water Council) who had carried out an investigation among their member
18、s into the use and behaviour of valves based on BS 1010:1959 when used underground. Experience of the exacting conditions and lack of accessibility in situations where they were installed led to the recommendation for a stronger valve with special design features to match the operating conditions. T
19、he dimensions given are those considered necessary to ensure the production of valves of nominal size to 2 suitable for underground water services. It is recommended that the body of the valve and the metal components be based on gunmetals and bronzes for strength and that attention be given to resi
20、stance 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 of the head screwing out of the body when the stopvalve is being opened or tu
21、rned with a key. BS 1010:1959 has been retained and retitled “Part 1: Imperial units”. Above-ground stopvalves are now included in the metric version BS 1010-2:1973. In this standard, dimensions are expressed in metric terms except that pipe thread designations accord with BS 2779. Requirements for
22、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 Committee (EPC/-). A British Standard does not purport to include all the necessa
23、ry 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 to iv, pages 1 t
24、o 18, 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 5433:1976 BSI 08-19991 Section 1. General 1 Scope This British Standard appl
25、ies to copper alloy screwdown stopvalves of nominal sizes from to 2 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 stopvalves with ends screwed internally or externally or arranged in accor
26、dance with clause 25, 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 the following definition applies, together with any which are rele
27、vant in BS 2591-1. 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 suitable means of connection for insertion in a pipeline. The use
28、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 intended to indicate design. 5 Nominal size Stopvalves shall be designa
29、ted 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 mark; b) the number of this British Standard, i.e. BS 5433. On th
30、e 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 components shall be as specified in Table 3, Table 4 and Table 5. Dime
31、nsions 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 (body test). In both cases the test shall consist of either a hydrau
32、lic test at not less than 21 bar1) or a pneumatic test at not less than 5 bar 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 being tested shall neither leak nor sweat during tests. 9 M
33、aterials 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 suitable than those listed in Table 1, not more susceptible to cor
34、rosion, 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 lubricants used in the construction, shall not constitute a t
35、oxic 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) 1 bar= 105 N/m2= 100kPa. BS 5433:1976 2 BSI 08-1999 Table 1 Materials 123456789 2Basic materia
36、l formSand castingsNon-forging stockForging stock 3 Stopvalve component parts Material specification 4BodyXXX 5HeadXXXXXX 6Gland nominal size and onlyXXX 7nominal size 1 and overXXXXXX 8Spindlenominal size and onlyXXXX 9nominal size 1 and overXXXXX 10CrutchXXXXX 11Washer plateXXXXXX 12NutXXX 13Squar
37、e headXXXXXXX 14Union nuts, compression nuts and tail pipesXXXXXX 15Seating washerVulcanized synthetic rubber complying with the requirements of clause 6 of BS 3457:1973 16Head seal “O”-ringRubber complying with the requirements of BS 2494 17Gland packingSee clause 24 18Pinning wire for square headB
38、S 2874, CZ 121 or CZ 122 BS 5433:1976 BSI 08-19993 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 shall be neatly dressed and no c
39、asting 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 BS 3885. 12 Machining The bodies, heads, spindles and other parts shall be truly machined so that, when
40、 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, no part of any component of
41、a valve shall be of less thickness than that shown in Table 3, line 4. Minimum thicknesses for unions are given in Table 12; see also clause 25. Section 4. Design and construction 14 Waterway Except where otherwise stated, the area of waterway throughout the body of a valve shall be not less than th
42、e 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 dimensions shall be not le
43、ss than is specified for the appropriate size of union in BS 864-2. Figure 1 Underground stopvalve BS 5433:1976 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 of not less than 0.5 m
44、m and not more than 0.8 mm. The minimum thickness of metal supporting the seat shall be as given in Table 3, line 3. 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 corresponding int
45、ernal 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 BS 84 so far as it is applicable. 16.2 Inlet and outlet. Ex
46、cept 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 BS 2779:1973, for external threads; or 2) comply with the requirements of Tabl
47、e 4M or Table 4 of BS 2779:1973, 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 BS 21; or 2) be tapped or screwed to comply with the requirements of BS 61; or 3
48、) comply with the requirements of clause 25. 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 than 70 % of the external diameter of the threaded portion of the spindl
49、e 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, the end of the spindle projects beyond the face of the head at least 0.8 mm in nominal sizes up to 1 and at least 1.6 mm in larger sizes so that the top of the washer plate shall be clear of the bottom of the head when the valve is fully open. A recess shall be formed at the top of the thread equ