BS 5433-1976(R2007) 供水用地下闸阀规范.pdf

BRITISH STANDARD BS 54331976 Incorporating Amendment Nos. 1 and 2 Specification for Underground stopvalves for water services UDC 696.117621.646.651 CONFIRMED DECEMBER 2007 BS 54331976 This British Standard, having been prepared under the direction of the Sanitary Appliances Standards Committee, was published under the authority of the cutive 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 73/13411 DC ISBN 0 580 09630 0 Cooperating organizations The Sanitary Appliances Standards Committee, 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 Manufacturers’ 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* 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 organizations 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 British 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 Development Associationand Mechanical Services Contractors Copper Tube Fittings Manufacturers’Society of British Gas Industries AssociationSouth London Consortium Department of the Environment, BuildingThames Water Authority Metropolitan Research EstablishmentWater Division Department of Prices and ConsumerIndividual experts Protection Amendments issued since publication Amd. No.Date of issueComments 3570December 1981 4596September 1984Indicated by a sideline in the margin BS 54331976 BSI 08-1999i Contents Page Cooperating organizationsInside front cover Forewordiii Section 1. General 1Scope1 2References1 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 17Head seal4 18Washer plate4 19Bodies and heads5 20 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 underground 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 stopvalve 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 internal on heads for engagement with spindle threads external limits and tolerances normal class15 BS 54331976 ii BSI 08-1999 Page Table 8 BS Whitworth screw threads external on heads for engagement with body threads internal limits and tolerances medium class15 Table 9 BS Whitworth screw threads internal on bodies for engagement with head threads external limits and tolerances medium class16 Table 10 BS Whitworth screw threads external on glands for engagement with stuffing box threads internal limits and tolerances medium class16 Table 11 BS Whitworth screw 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 54331976 BSI 08-1999iii 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 National Water Council who had carried out an investigation among their members into the use and behaviour of valves based on BS 10101959 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. The 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 resistance against dezincification. There is provision for alternative s 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 turned with a key. BS 10101959 has been retained and retitled “Part 1 Imperial units”. Above-ground stopvalves are now included in the metric version BS 1010-21973. In this standard, dimensions are expressed in metric terms except that pipe thread designations accord with BS 2779. Requirements for s of testing suitability of materials for use in contact with water for domestic purposes will 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 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 to iv, pages 1 to 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 54331976 BSI 08-19991 Section 1. General 1 Scope This British Standard applies 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 accordance 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 relevant 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 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 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 ination. On the headwork and body a manufacturer’s name or mark; b the number of this British Standard, i.e. BS 5433. 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 components 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 body test. In both cases the test shall consist of either a hydraulic 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 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 suitable 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 lubricants 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 1 bar 105 N/m2 100 kPa. BS 54331976 2 BSI 08-1999 Table 1 Materials 123456789 2Basic material Sand castingsNon-forging stockForging 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 BS 2874 PB 102 Phosphor bronze BS 2872 CA 104 Aluminium bronze 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 13Square headXXXXXXX 14Union nuts, compression nuts and tail pipesXXXXXX 15Seating washerVulcanized synthetic rubber complying with the requirements of clause 6 of BS 34571973 16Head seal “O”-ringRubber complying with the requirements of BS 2494 17Gland packingSee clause 24 18Pinning wire for square headBS 2874, CZ 121 or CZ 122 BS 54331976 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 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 BS 3885. 12 Machining The bodies, heads, spindles and other parts shall be 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, no part of any component of 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 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 dimensions shall be not less than is specified for the appropriate size of union in BS 864-2. Figure 1 Underground stopvalve BS 54331976 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 mm 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 and right-handed. The external thread on spindles and the 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 BS 84 so far as it is applicable. 16.2 Inlet 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 BS 27791973, for external threads; or 2 comply with the requirements of Table 4M or Table 4 of BS 27791973, 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 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 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 ed 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 nomi