1、BRITISH STANDARD BS1212-3: 1990 Float operated valves Part3: Specification for diaphragm type float operated valves (plastics bodied) for cold water services only (excluding floats)BS1212-3:1990 This British Standard, having been prepared under the directionof the Building ServicesStandards Policy C
2、ommittee, waspublished underthe authorityof the BoardofBSI andcomes intoeffecton31December1990 BSI04-1999 First published July1979 Second edition December1990 The following BSI references relate to the work on this standard: Committee reference SEB/2 Draft for comment88/14227DC ISBN 0 580 18969 4 Co
3、mmittees responsible for this British Standard The preparation of this British Standard was entrusted by the Building Services Standards Policy Committee (SEB/-) to Technical Committee SEB/2, upon which the following bodies were represented: Association of Manufacturers of Domestic Electrical Applia
4、nces Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) Association of Water Officers Ltd. British Bathroom Council British Gas plc British Non-Ferrous Metals Federation British Plastics Federation British Plumbing Fittings Manufacturers Association British Valve an
5、d Actuator Manufacturers Association Builders Merchants Federation Consumer Policy Committee of BSI Department of the Environment (Building Research Establishment) Department of the Environment (Property Services Agency) Department of the Environment (Water Directorate) Department of Trade and Indus
6、try (National Weights and Measures Laboratory) Institute of Clerks of Works of Great Britain Inc. Institute of Plumbing Insittution of Gas Engineers Institution of Water and Environmental Management Metal Sink Manufacturers Association National Association of Plumbing, Heating and Mechanical Service
7、s Contractors Royal Institute of British Architects Society of British Gas Industries South London Consortium Water Companies Association Water Services Association of England and Wales Amendments issued since publication Amd. No. Date CommentsBS 1212-3:1990 BSI 04-1999 i Contents Page Committees re
8、sponsible Inside front cover Foreword ii Section 1. General 1 Scope 1 2 Definitions 1 3 Designation for ordering 1 4 Marking 1 Section 2. Materials 5 Effect of non-metallic materials on water quality 4 6 Plastics 4 7 Metals 4 Section 3. Design, construction and dimensions 8 Inlet connection 5 9 Seat
9、s 6 10 Backnuts 6 11 Float arm or float arm assembly 6 12 Discharge arrangement 6 Section 4. Performance 13 Distortion and deflection 8 14 Hydraulic pressure 8 15 Backflow prevention 8 16 Flow 8 17 Endurance 8 Appendix A Distortion test for backnuts and inlet shank 9 Appendix B Diaphragm type float
10、operated valve assembly test 9 Appendix C Float attachment thread distortion test 12 Appendix D Shut-off pressure test 12 Appendix E Method of test for effect of dynamic pressure on discharge arrangement 13 Appendix F Backflow prevention test 13 Appendix G Flow test 14 Appendix H Endurance test 16 F
11、igure 1 Illustration of effective warning water level in relation to other commonly defined levels in a British Standard flushing cistern 2 Figure 2 Bottom entry valve inlet arrangement 3 Figure 3 Side inlet shank connectors 5 Figure 4 Hexagonal backnuts 6 Figure 5 Float connecting dimensions 7 Figu
12、re 6 Inlet shank and backnuts test plate 9 Figure 7 Valve assembly deflection test 10 Figure 8 Float attachment thread distortion test piece 12 Figure 9 Typical arrangement of apparatus for backflow prevention test 14 Figure 10 Flow test apparatus 15 Publications referred to Inside back coverBS1212-
13、3:1990 ii BSI 04-1999 Foreword This Part of BS1212 has been prepared under the direction of the Building Services Standards Committee. It is a revision of BS1212-3:1979, which is withdrawn. This Part of BS1212 specifies the operational requirements of diaphragm type float operated valves (plastics b
14、odied) (excluding floats) for use with cold water services only. It is a performance-based specification and the dimensional requirements are solely those essential to ensure fitting and interchangeability of complete valves. The new features incorporated in this revision of BS1212-3 include the fol
15、lowing: a) bottom entry requirements; b) high pressure flow requirements; c) rationalization to one size of float; d) float attachment requirements; e) dynamic pressure test requirements; f) increased shut-off performance requirements. The reference to lever ratio given in BS1212-3:1979 has been del
16、eted. Terms of measurement are expressed in metric units except for pipe thread sizes which are retained in imperial units to accord with BS2779. For plastics floats, the designations specified in BS2456 have been used. A British Standard does not purport to include all the necessary provisions of a
17、 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 and ii, pages1 to16, an inside bac
18、k 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 theinside front cover.BS 1212-3:1990 BSI 04-1999 1 Section 1. General 1 Scope This Part of BS1212 specifies the performance require
19、ments, materials, certain dimensions and tolerances of diaphragm type float operated valves (plastics bodied) of nominal size for cold water services only, capable of accepting interchangeable low or high pressure renewable seats for use at pressure up to and including 3bar 1)and up to and including
20、14bar respectively (see9.1) and intended for use with114S or114NS floats (plastics) conforming to BS2456. NOTE 1The nominal size is that corresponding with the ClassGB pipe thread specified in BS2779. NOTE 2The titles of the publications referred to in this standard are listed on the inside back cov
21、er. 2 Definitions For the purposes of this Part of BS1212 the following definitions apply. NOTEFor further definitions see BS4118. 2.1 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
22、 with a discharge arrangement to conduct water into the cistern to which the float operated valve is to be fitted 2.2 effective warning water level the level when water reaches10mm above the invert of a side entry connection warning pipe or10mm above the overflow level of a bottom connection warning
23、 pipe in a British Standard flushing cistern NOTEFigure 1 gives an illustration of effective warning level in relation to other commonly defined levels in a British Standard flushing cistern. 2.3 datum level for backflow prevention test purposes 2.3.1 for side or bottom entry diaphragm type float op
24、erated valves with a horizontal seat centre line, the horizontal centre line at the seat 2.3.2 for side or bottom entry diaphragm type float operated valves having no horizontal seat centre line, the interface of the seat and diaphragm 3 Designation for ordering Diaphragm type float operated valves
25、shall be designated by the following: a) the words “diaphragm type float operated valve” followed by the number of this British Standard in the form of BS1212/3. b) whether side or bottom entry is required; c) if bottom entry, the height of the effective warning water level (see Figure 2). Example.
26、“Diaphragm type float operated valve, BS1212/3 bottom entry, H =250mm”. 4 Marking A diaphragm type float operated valve shall be permanently and legibly marked with the following information in such a way as not to deform any working part: a) the number of this British Standard, in the form BS1212/3
27、 2) ; b) the manufacturers name or trade mark; c) the words “cold water only”. 1) 1bar=10 5 N/m 2 =10 5 Pa. 2) Marking BS1212/3 on or in relation to a product represents a manufacturers declaration of conformity,i.e. a claim by or on behalf of the manufacturer that the product meets the requirements
28、 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 conformity, which may also be desirable.BS 1212-3:1990 2 BSI 04-1999 Figure 1 Illustration of effective warnin
29、g water level in relation to other commonly defined levels in a British Standard flushing cisternBS 1212-3:1990 BSI 04-1999 3 Figure 2 Bottom entry valve inlet arrangementBS1212-3:1990 4 BSI 04-1999 Section 2. Materials 5 Effect of non-metallic materials on water quality When used under the conditio
30、ns for which they are designed, non-metallic materials in contact with or likely to come into contact with potable water shall comply with BS6920-1. 6 Plastics With the exception of seats and backplate plungers, where no reworked material shall be used, the plastics parts of diaphragm type float ope
31、rated valves shall be manufactured from materials containing, if required, the addition of not more than15% of the manufacturers own clean reworked material complying with this Part of BS1212. No other reworked material shall be used. NOTEWhen choosing plastics materials, manufacturers should take d
32、ue account of the characteristics required for satisfactory use, i.e.mechanical, dimensional and chemical stability. 7 Metals When components are manufactured from metals, the grade of material shall be chosen from the following list: a) backnuts, lever arm or lever arm assembly: BS2874CZ121; or BS2
33、874CZ132; or BS2872CZ122; or BS2872CZ129; b) split cotter pin: BS2873CZ108.BS 1212-3:1990 BSI 04-1999 5 Section 3. Design, construction and dimensions 8 Inlet connection 8.1 General Both side and bottom entry connection valves (for fitting into cisterns complying with BS1125) shall incorporate an in
34、let assembly with a connection designed for use with either spigot or compression type connectors complying with BS864-2 and shall have the dimensions given in (a) or (b) of Figure 3, as appropriate. 8.2 Bottom inlet connection A bottom inlet assembly shall incorporate either an integral flange with
35、out spigot or an integral flange with spigot and shall have the dimensions given in (a) or (b) of Figure 2, as appropriate. A bottom inlet assembly shall be supplied with a sealing washer to facilitate connection into the cistern. 8.3 Locking stay A bottom entry valve assembly shall be supplied with
36、 an adjustable lockable stay at the upper end to act as a stop against the wall of the cistern. Figure 3 Side inlet shank connectorsBS1212-3:1990 6 BSI 04-1999 9 Seats 9.1 Number of seats Every valve shall be supplied with interchangeable high pressure (HP) and low pressure (LP) seats. NOTEThe HP se
37、at is intended for use with water pressures from a minimum of3bar to a maximum of14bar and the LP seat is intended for use with water pressure of3bar and below. 9.2 Colour Seats shall be coloured white for HP, and red for LP. 9.3 Distance between seat and diaphragm The minimum distance between the s
38、eat outlet orifice and the shutting off face of the diaphragm shall be1.5mm when in the fully open position. 10 Backnuts 10.1 General Backnuts shall be of the following types (seeFigure 4). a) Type (a). With a flange as dimensioned in (a) of Figure 4. b) Type (b). With a spigot as dimensioned in (b)
39、 of Figure 4. c) Type (c). Without a flange as dimensioned in (c) of Figure 4. 10.2 Backnuts for use with side entry valves An inlet shank or shank assembly shall be provided with two backnuts, one of which shall be type (b) (see10.1). 10.3 Backnuts for use with bottom entry valves An inlet shank wi
40、thout an integral spigot, see (a) of Figure 2, shall be fitted with a type (b) backnut (see10.1). An inlet shank incorporating an integral spigot, see(b) of Figure 2, shall be fitted with either a type(a), type (b) or type (c) backnut (see10.1). 11 Float arm or float arm assembly 11.1 Adjustment The
41、 valve shall be provided with a positive, readily accessible, method of adjustment and locking of the floats position without bending the lever to set the water level in the cistern into which the valve is fitted. 11.2 Float connecting dimensions The float end of the float arm or float arm assembly
42、shall be provided with a screwed portion for the attachment of a114S or114NS float complying with BS2456 (see Figure 5). 12 Discharge arrangement 12.1 Diaphragm type float operated valves shall comply with clause15 (see note). Where the discharge arrangement outlet point is above the datum level for
43、 backflow prevention test purposes, the construction shall not facilitate the subsequent fitting of any pipe or device to conduct water to a lower level. Figure 4 Hexagonal backnutsBS 1212-3:1990 BSI 04-1999 7 NOTEWhere the discharge arrangement outlet is below the datum level for backflow preventio
44、n test purposes it is permissible to incorporate one or more constantly open air inlets or backflow prevention devices. 12.2 The discharge arrangement shall not obstruct the fitting of the valve into a British Standard WC flushing cistern. Figure 5 Float connecting dimensionsBS1212-3:1990 8 BSI 04-1
45、999 Section 4. Performance 13 Distortion and deflection 13.1 Backnuts and inlet shank When tested as described in Appendix A there shall be no visible distortion of either the threads on the inlet shank or backnut(s) or of the flats of the backnut(s), that will effect the efficiency of the assembly.
46、 13.2 Valve assembly When tested as described in Appendix B the initial deflection measured at the end of the float arm or float arm assembly shall be not greater than25mm and the additional deflection shall be not greater than12mm, resulting in a total deflection of not more than37mm. 13.3 Float at
47、tachment When tested as described in Appendix C the screwed portion of the float arm or float arm assembly for attachment of the float shall show novisible damage or distortion that will effect the efficiency of the assembly. 14 Hydraulic pressure 14.1 Static pressure Whilst held in the closed posit
48、ion, a diaphragm typefloat operated valve shall be capable of withstanding a pressure of20+0.25, 0 bar for a period of60 +5, 0s without leaking. 14.2 Shut-off pressure When tested as described in Appendix D a diaphragm type float operated valve when assembled in working condition and fitted with the
49、 appropriate seat and a114S or114NS float complying with BS2456 shall withstand a pressure up to3bar for a LP seat and a presure up to14bar for a HP seat, as appropriate, without passing water. 14.3 Dynamic pressure on discharge arrangement When tested as described in Appendix E a diaphragm type float operated valve together with its discharge arrangement shall show no permanent deformation or separation of any component part. 15 Backflow When tested as described in Appendix F a diaphragm type float operated valve of either side
