BS 1212-2-1990浮子阀.第2部分隔膜型浮子阀(铜合金阀体)(不含浮子).pdf

BRITISH STANDARD BS 1212-2 1990 Float operated valves Part 2 Specification for diaphragm type float operated valves copper alloy body excluding floats UDC 621.646.618621.646.38 Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 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 29 June 1990 BSI 01-2000 First published September 1970 First revision June 1990 The following BSI references relate to the work on this standard Committee reference SEB/2 Draft for comment 83/11865 DC ISBN 0 580 15846 2 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the 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 Officers 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’ Association Council of British Ceramic Sanitaryware Manufacturers Department of the Environment Building Research Establishment Department of the Environment Property Services Agency Department of the Environment Water Directorate Department of Trade and Industry National Weights and Measures Laboratory 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 Contractors 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 issueComments Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 BSI 01-2000i Contents Page Committees responsibleInside front cover Forewordiii Section 1. General 1Scope1 2Definition1 3Designation for ordering1 4Marking1 Section 2. Materials 5Quality and finish2 6Plastics2 7Castings2 8Hot stampings2 9Mouldings2 10Machining2 Section 3. Design, construction and dimensions 11General4 12Screw threads4 13Inlet connection4 14Backnuts4 15Bodies4 16Body coupling nuts4 17Backplate nuts4 18Backplates5 19Backplate plungers5 20Seats5 21Diaphragms5 22Levers5 23Float adjusters and thumb screws5 24Split cotter pins5 25Discharge arrangement5 Section 4. Perance 26Hydraulic pressure and shut-off6 27Backnut distortion6 28Backflow prevention6 29Flow6 30Hydraulic pressure on discharge arrangement6 Appendix A of test for shut-off when assembled with appropriate float17 Appendix B of test for distortion of size “ plastics backnuts17 Appendix C of test for backflow prevention17 Appendix D of test for flow18 Appendix E of test for effect of hydraulic pressure on discharge arrangement18 Figure 1 Section of typical size diaphragm type float operated valve6 Figure 2 Inlet shanks8 Figure 3 Inlet elbows9 Figure 4 Backnuts10 Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 ii BSI 01-2000 Page Figure 5 Body11 Figure 6 Body coupling nuts12 Figure 7 Backplate nuts12 Figure 8 Backplate13 Figure 9 Backplate plunger13 Figure 10 Seats and joint ring for seats14 Figure 11 Diaphragm15 Figure 12 Lever16 Figure 13 Float adjuster and thumb screw16 Figure 14 Typical arrangement of apparatus for backflow prevention test19 Figure 15 Typical arrangement of apparatus for flow test19 Table 1 Materials3 Table 2 Seats15 Table 3 Seat and float combination17 Publications referred toInside back cover Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 BSI 01-2000iii Foreword This Part of BS 1212 has been prepared under the direction of the Building Services Standards Committee and specifies requirements for diaphragm type float operated valves excluding floats. It supersedes BS 1212-21970, which is withdrawn. The new features in this Part of BS 1212 include the following a the possible production of certain components from plastics materials; b a seat numbering system; c a bottom entry inlet connection and its associated inlet elbow, with adjustable stay; d a recognition of the greater lifting effort of plastics floats over copper floats of equivalent size; e a test for plastics backnut strength, in line with BS 1212-3; f a recognition of current manufacturing practice by deletion of reference to the use of agate tipped seats; g a recognition of s of attachment of the discharge arrangements currently used in float valves manufactured in accordance with BS 1212-3, and a test to verify their effectiveness; h a modification of the of dimensioning some components to ensure the lever does not rise above the horizontal at valve closure; j the dimensional alignment of the body inlet connection with BS 1212-1, which now requires only one seat joint ring for either plastics or metal seats. Float operated valves complying with BS 1212-2 and carrying the Kitemark are automatically eligible for listing in the Water Research Centre Fittings Scheme Directory of Water Fittings. This Part of BS 1212 has been revised in metric terms, except for certain thread sizes and pipe thread designations which are retained in imperial sizes to accord with BS 2779. 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 20, 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. Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI iv blank Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 BSI 01-20001 Section 1. General 1 Scope This Part of BS 1212 specifies materials, dimensions, tolerances and perance requirements for diaphragm type float operated valves copper alloy body of nominal sizes and “ with seat numbers 3, 5, 6 and 9 intended for use with floats complying with BS 1968 and BS 2456. NOTE 1The nominal sizes correspond with the pipe size of the thread on the inlet shank as specified in BS 2779. The nominal size is ed by making a special inlet on the size “. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cover. 2 Definition For the purposes of this Part of BS 1212 the following definition applies. diaphragm type float operated valve a float operated valve in which the flow of water is controlled by the flexing of a diaphragm and which incorporates or is fitted with a discharge arrangement to conduct water into the cistern to which the float operated valve is to be fitted NOTEIn operation, flow from the valve reduces as the water level rises towards shut-off water level. The change in water level over which the flow progressively reduces from maximum to zero is at least four times the nominal size of the valve. 3 Designation for ordering Diaphragm type float operated valves shall be designated by the following a the nominal size; b the words “diaphragm type float operated valve”; c the seat number; d the number of this British Standard in the of BS 1212-2; e bottom entry connection, if required. Example. “Nominal size diaphragm type float operated valve, no. 6 seat, BS 1212-2”. 4 Marking 4.1 General A diaphragm type float operated valve shall be permanently and legibly marked in accordance with 4.2 and 4.3 in such a way as not to de any working part. 4.2 On the body Rolled, cast or stamped on the body, backplate or backplate coupling nut shall be the following a the number of this British Standard in the BS 1212-2 1; b the manufacturer’s name or trade mark. 4.3 On every seat including spares The flange of the seat shall be marked with the following a the manufacturer’s name or trade mark; b the designation of the seat 3, 5, 6 or 9 see 20.2. In the case of plastics seats, the marking shall be either within the recess for embossed marking or on the flat face for engraved marking see clause 20 and Figure 10. 1 Marking BS 1212-2 on or in relation to a product represents a manufacturer’s declaration of conity, i.e. a claim by or on behalf of the manufacturer that the product meets the requirements of the standard. The accuracy of the claim is therefore solely the responsibility of the person making the claim. Such a declaration is not to be confused with third party certification of conity, which may also be desirable. Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 2 BSI 01-2000 Section 2. Materials 5 Quality and finish 5.1 General The materials to be used in the construction of components for diaphragm type float operated valves shall be chosen from those given in Table 1. 5.2 Effect of non-metallic materials on water quality 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 comply with BS 6920-1. 6 Plastics 6.1 With the exception of seats, backplates and backplate plungers, where no reworked material shall be used see 6.2 and 6.3, the plastics parts of diaphragm type float operated valves shall be manufactured from the materials given in Table 1 with, if required, the addition of not more than 15 of the manufacturer’s own clean reworked material complying with this Part of BS 1212. No other reworked material shall be used. 6.2 Seats from plastics shall be manufactured from new nylon, acetal polymer or polypropylene copolymer of a hardness not less than D75 Shore when measured in accordance with BS 2782-3 365B. 6.3 Backplates and backplate plungers from plastics shall be manufactured from new acetal polymer with a hardness not less than D80 Shore when measured in accordance with BS 2782-3 365B. 7 Castings Cast components shall be sound and shall comply with BS 6615. 8 Hot stampings Hot stamped components shall be sound and shall comply with BS 3885. 9 Mouldings Mouldings shall be sound and free from flash. 10 Machining All machining shall be carried out so that parts comply with the dimensions specified in this Part of BS 1212 and are correctly aligned when assembled. All machined surfaces shall be free from burrs. Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 BSI 01-20003 Table 1 Materials Material/material specification Component CastingsRod for hot pressings, forging and machining Stainless steel RubbersFibresPlastics BS 1400 SCB1 or SCB3 see note 1 BS 1400 DCB3 BS 1400 PCB1 BS 1400 LG1 or LG2 BS 2872 CZ122 BS 2872 CZ129 BS 2874 CZ121 BS 2874 CZ132 BS 2874 PB102 BS 1400 G1 BS 970-1 304515 Synthetics of 60 to 70 IRHD see BS 903-A26 BS 3964 or BS 5292 Acetal polymer Nylon Polypropyfen e copolymer BodyXXXXXXX BackplateXXXXXX X Backplate nutXXXXXXX DiaphragmX LeverXXXXXXXX Backplate plunger see note 2XXXXXXXX See 6.3 Float adjusterXXXXXXXX X Thumb screwXXXXXXXX SeatXX XX See 6.2 X Joint ringInlet shank to seatXX XXX Inlet adaptor to inlet elbow XX XXX Inlet shankXXXXXXX Body coupling nutXXXXXXX Integral flange backnut type a size “ XXXXXXX XX size X XXXXXX Spigoted backnut type b size “ XXXXXXX XX size XXXXXXX Fixed flange backnut type c size “ XXXXXXX XX size XXXXXXX Inlet elbowXX X XXXX Inlet adaptorXXXXXXX Split cotter pin See clause 24 Discharge arrangementSee 25.6 NOTE 1Copper content may be reduced to 62 for SCB1 and SCB3. NOTE 2Brass backplate plungers may be electroplated with nickel or tin. Licensed copyPONTYPRIDD COLLEGE, 13/02/2008, Uncontrolled Copy, BSI BS 1212-21990 4 BSI 01-2000 Section 3. Design, construction and dimensions 11 General A diaphragm type float operated valve shall have a general arrangement as shown in Figure 1 and shall have dimensions complying with clauses 12 to 25 with a working tolerance of 0.3 mm unless specified in this Part of BS 1212. 12 Screw threads Unless otherwise specified in this Part of BS 1212, screw threads shall comply with the free fit or normal class requirements of the relevant British Standard. 13 Inlet connection 13.1 General Every inlet shank shall be screwed externally with parallel fastening thread that complies with class B of BS 2779 and is of the same nominal size as the valve see Figure 2. 13.2 Side entry valves For side entry valves, the inlet shank shall have dimensions as given in Figure 2a. 13.3 Bottom entry valves size “ only For bottom entry valves, an integral flange shall be provided on the inlet shank with dimensions as given in Figure 2b, and shall be supplied with a sealing washer to facilitate connection of the cistern. 13.4 Connection to 12 mm and 15 mm copper tube When the end of the inlet shank is required to have dimensions suitable for connecting to 12 mm and 15 mm copper tube, the inlet details shall be as given in Figure 2c. 13.5 Inlet elbow and inlet adaptor for bottom entry valves size only Inlet elbows and inlet adaptors shall have dimensions as given in Figure 3. Connection to the float valve shall be by the bottom inlet elbow shown in Figure 3a or by the alternative inlet elbow end, joint ring and adaptor shown in Figure 3b. NOTEProvision for tightening may be made in the bore of the inlet adaptor provided the flow through the seat is not reduced. Connection between the bottom inlet shank and the inlet elbow shall be by means of suitably ed copper tube complying with Table X or Table Y of BS 2871-11971, the seal being made by a capillary or compression joint complying with BS 864-2 or by any such that the seal complies with clause 26. Each bottom entry valve assembly shall be provided with an adjustable lockable stay at its upper end to act as a stop against the cistern wall. 14 Backnuts 14.1 General Backnuts shall be of the following types see Figure 4. Type a. With an integral flange used for securing the inlet shank to the cistern when tightened against the outside wall of the cistern. Type b