1、BRITISH STANDARD BS 2767:1991 Incorporating Amendment No. 1 Specification for Manually operated copper alloy valves for radiators ICS 91.140.10 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBS 2767:1991 This British Standard, having been prepared under the direction of the Re
2、frigeration, Heating and Air Conditioning Standards Policy Committee, was published under the authority of the Board of BSI and comes into effect on 31 January 1991 BSI 03 December 2001 First published December 1956 Second edition August 1972 Third edition January 1991 The following BSI references r
3、elate to the work on this standard: Committee reference RHE/16 Draft for comment 87/73087 DC ISBN 0 580 19042 0 Committees responsible for this British Standard The preparation of this British Standard was entrusted by the Refrigeration, Heating and Air Conditioning Standards Policy Committee (RHE/-
4、) to Technical Committee RHE/16, upon which the following bodies were represented: Association of Manufacturers of Domestic Unvented Supply Systems Equipment (MODUSSE) BEAMA Ltd. Association of Control Manufacturers (TACMA) British Gas plc British Plumbing Fittings Manufacturers Association British
5、Valve and Actuator Manufacturers Association Building Services Research and Information Association Department of the Environment (Property Services Agency) Heating and Ventilating Contractors Association Hevac Association Institute of Domestic Heating Engineers Institute of Refrigeration Institutio
6、n of Gas Engineers Society of British Gas Industries Amendments issued since publication Amd. No. Date Comments 13147 03 December 2001 Indicated by a sidelineBS 2767:1991 BSI 03 December 2001 i Contents Page Committees responsible Inside front cover Foreword ii 1S c o p e 1 2 Definitions 1 3 Designa
7、tion of valves by size 1 4 Pressure and temperature ratings 2 5M a r k i n g 2 6 Materials and manufacture 2 7 Design and construction 4 8T y p e t e s t s 9 9 Routine pressure tests 9 Appendix A Information to be supplied and requirements to be agreed 11 Appendix B Method of testing the torque stre
8、ngth of the handwheel when assembled to the valve 11 Appendix C Method of testing the torque strength of the union nut 12 Figure 1 Typical angle pattern valve 5 Figure 2 Typical Y-pattern valve 6 Figure 3 Typical gate pattern valve 7 Figure 4 Tailpiece incorporating an auxiliary valve 10 Figure 5 Ar
9、rangement for testing the resistance of the handwheel to torque 12 Table 1 Materials 3 Table 2 Minimum flow area through valve and tailpiece 4 Table 3 Component dimensions 5 Table 4 Test requirements for rubber stem seals 8 Table 5 Torque values for testing the handwheel when assembled to the valve
10、11 Table 6 Torque values for testing the union nut 12 Publication(s) referred to 13BS 2767:1991 ii BSI 03 December 2001 Foreword This revision of BS 2767 has been prepared under the direction of the Refrigeration, Heating and Air Conditioning Standards Policy Committee and supersedes BS 2767:1972 wh
11、ich is withdrawn. It takes into account developments in manufacture and testing of radiator valves, and latitude is allowed for variation in design of these valves. The principal changes in this revision are as follows. a) The title includes the words “manually operated” to indicate exclusion of the
12、rmostatic radiator valves which are covered in BS 6284. b) Pressure and temperature ratings are unchanged but guidance is given where compression or capillary ends in accordance with BS 864-2 are used. c) A test for the torque strength of the handwheel is included. d) Unions have been omitted owing
13、to the decrease in their use. e) A test for the torque strength of the union nut is included. f) The 1 size valve has been deleted owing to diminished use, but connections for 8 mm, 10 mm and 12 mm copper tube are now included. g) Compression type tailpiece connections are included (see Figure 1). h
14、) Tests are divided into type tests and routine tests. i) The grade of chromium plating is specified. j) A new method of defining minimum flow area is given that aligns with BS 864-2. k) Provisions have been made for a draining facility to be incorporated in the valve body or tailpiece. l) Tests for
15、 rubber stem seals have now been related to valve types. 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 leg
16、al obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, pages 1 to 13 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Sidelining in this document indicates the most recent change
17、s by amendment.BS 2767:1991 BSI 03 December 2001 1 1 Scope This British Standard specifies materials, essential aspects of design, and performance requirements for manually operated copper alloy valves for connection to hot water radiators. Two types of valve are specified on the basis of their pres
18、sure ratings; type 4 with a maximum working pressure of 4 bar 1)and type 10 with a maximum working pressure of 10 bar. The range of sizes covered is suitable for use with radiators having in, in, or 1 in female threaded connections in accordance with BS 21. End connections for connection to the valv
19、e of 8, 10, 12, 15, 22 and 28 mm copper tube, and threads for , and 1 in threaded iron pipe are included. The standard also covers valves with tailpieces, including tailpieces which incorporate a draining facility or an auxiliary valve. NOTE 1 All pressures given are gauge pressures. NOTE 2 Figure 1
20、, Figure 2 and Figure 3 are solely for the purpose of showing alternative types, part names and, collectively, some typical variations of detail; they are not intended to influence design. NOTE 3 Information to be supplied by the purchaser and requirements to be agreed between supplier and purchaser
21、 are given in Appendix A. NOTE 4 The publications referred to in this Standard are listed on the inside back cover. 2 Definitions For the purposes of this British Standard the following definitions apply. 2.1 manually operated valve a valve controlling the flow of water to or from a radiator to whic
22、h it is fitted the flow is set by the operation of a handwheel or loose key 2.2 handwheel valve a valve fitted with a handwheel to control the flow of water 2.3 lockshield valve a valve, fitted with a lockshield, which, after having been set to a desired flow, cannot be altered except by use of a sp
23、ecial key or the removal of the lockshield 2.4 draining facility a facility incorporated in a valve by which an individual radiator can be drained NOTE The radiator is drained by closing the valves and opening the draining facility. 2.5 auxiliary valve an additional valve incorporated within the tai
24、lpiece to enable the radiator to be removed without draining 3 Designation of valves by size The size by which the valves are designated shall be the nominal diameter of the tube or pipe with which the valves are to be used. For example: a) for an 8 mm copper tube the designation shall be 8; b) for
25、a in threaded pipe the designation shall be . 1) 1 bar = 10 5N/m 2= 10 5Pa.BS 2767:1991 2 BSI 03 December 2001 4 Pressure and temperature ratings The pressure and temperature ratings for the two types of valve shall be as follows. a) Type 4 valves shall have a maximum service temperature of 95 C and
26、 a maximum working pressure of 4 bar. b) Type 10 valves shall have a maximum service temperature of 120 C and a maximum working pressure of 10 bar. NOTE Where type 10 valves having inlet and outlet connections for compression and capillary fittings are intended to be used, reference should be made t
27、o Table 5 of BS 864-2:1983. The stem seals shall comply with 7.3. 5 Marking Valves shall be permanently and legibly marked with the following: a) the manufacturers name or mark; b) the number of this British Standard, i.e. BS 2767 2) , followed by the type of valve, i.e. 4 or 10. NOTE 1 The marks ma
28、y be applied to any convenient external part of the valve. NOTE 2 Additional marking is not precluded. 6 Materials and manufacture 6.1 The materials used in the manufacture of the component parts of the valves shall be as given in Table 1. 6.2 Materials shall be free from defects, such as cracking,
29、laminations, voids and inclusions. Castings shall not be burned, plugged, stopped or patched. All surfaces shall be free from burrs. 6.3 Plastics handwheels shall comply with 8.2. 2) Marking BS 2767 on or in relation to a product represents a manufacturers declaration of conformity, i.e. a claim by
30、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 conformity, which may also be desirabl
31、e.BS 2767:1991 BSI 03 December 2001 3 Table 1 Materials Gunmetal or brass for sandblasting Brass for diecasting Brass forging stock Brass not forging stock Plastics Phosphor bronze Rubber b Graphite impregnated fibre or PTFE c BS 1400 a LG2, SCB1 or SCB3 BS 1400 aDCB3 or PCB1 BS 2872 aCZ 122 or CZ 1
32、32 BS 2874 aCZ 121 or CZ 132 BS 2870 aPB 102 Body Bonnet and stuffing box Stem Disc Wedge Tailpiece Union nut Gland Gland nut Gland screw Lockshield Handwheel Combined handwheel and shield Stem seal: bellows type “O” ring one piece a Copper alloys complying with these standards are preferred. Other
33、copper alloys are acceptable provided they have the same minimum physical properties. b Test requirements for rubber stem seals are given in Table 4. c Polytetrafluoroethylene.BS 2767:1991 4 BSI 03 December 2001 7 Design and construction 7.1 General 7.1.1 Valves shall have one end supplied with a ta
34、ilpiece for connection to the radiator. The other end shall be in the form of a compression or capillary joint or shall have a female pipe thread. NOTE 1 The tailpiece may include an auxiliary valve or draining facility. NOTE 2 Examples of three designs of valves are shown in Figure 1, Figure 2 and
35、Figure 3. An alternative tailpiece incorporating an auxiliary valve is shown in Figure 4. 7.1.2 Valves (including the draining facility where incorporated) shall be capable of withstanding the appropriate hydrostatic test pressure specified in clause 8 without showing permanent distortion. 7.1.3 The
36、 minimum flow area through valves and tailpieces shall be not less than the area of a circle of the diameter given in Table 2. This shall not apply to any draining facility on the valve body or tailpiece. 7.1.4 The minimum body and bonnet thickness at any point subject to the internal pressure from
37、the water in the valve shall be not less than the values given in Table 3. If the valve has compression or capillary ends the wall thickness at this point shall comply with BS 864-2. 7.1.5 The minimum thickness of the ends of valves having female pipe threads shall be not less than the values given
38、in Table 3. Table 2 Minimum flow area through valve and tailpiece 7.1.6 The minimum stem diameters shall be as given in Table 3. 7.1.7 Valves shall be closed by rotating the stem in a clockwise direction viewed from the top of the valve. 7.1.8 Valves shall be supplied: a) with a natural finish, or c
39、hromium plated in accordance with 7.1.9 and 7.1.10; or b) with other surface finishes as agreed between purchaser and supplier see A.2a). Size designation Diameter of circle corresponding to minimum flow area Threaded (BS 21) Capillary/compression mm mm 86 . 0 10 8.0 12 10.0 15 12.0 22 18.0 12 82 4
40、. 0BS 2767:1991 BSI 03 December 2001 5 Table 3 Component dimensions Figure 1 Typical angle pattern valve Size designation Minimum body and bonnet thickness at any point subject to direct pressure Minimum thickness at end of valves having a female pipe thread (measured from the basic major diameter o
41、f the threads) Minimum diameter of stem for sealing Threaded (BS 21) Capillary/ compression mm mm mm mm 8 to 15 1.7 2.2 6.5 22 1.8 2.3 7.5 1 28 2.0 2.7 8.5BS 2767:1991 6 BSI 03 December 2001 7.1.9 Nickel plus chromium plating on copper alloys shall comply with BS 1224, service condition 1, classific
42、ation Cu/Ni 5b Cr r. 7.1.10 Nickel plus chromium plating on plastics material shall comply with BS 4601, service condition 1A, classification PL/Ni 5b Cr r. 7.2 Body connections 7.2.1 Compression and capillary ends Compression and capillary ends shall comply with BS 864-2. 7.2.2 Threaded ends If fem
43、ale threads are used these shall be either tapered or parallel and shall comply with BS 21. NOTE If the purchaser requires a different thread form this should be stated in the enquiry or order see A.1f). Provision shall be made for tightening the union or compression nut, for example by making it he
44、xagonal, octagonal or ribbed. 7.2.3 Tailpiece connection The body end arranged for the tailpiece connection shall have a parallel male thread for the attachment of the union nut and shall have an internal seating to engage the tailpiece. Figure 2 Typical Y-pattern valveBS 2767:1991 BSI 03 December 2
45、001 7 7.3 Stem seal and servicing The construction of the stems seals shall be a bellows type, a toroidal “O” ring or a one piece packer. NOTE 1 All stem seals should be suitable for continuous use at the maximum temperature and pressure for the type of valve (see clause 4). When tested using the me
46、thods specified in Table 4, toroidal “O” rings and rubber one piece packed stem seals shall meet the requirements given in Table 4. Type 4 valves shall be capable of being serviced without draining down the system or part thereof. NOTE 2 A small water loss may take place during servicing. NOTE 3 It
47、is not a requirement of this standard that type 10 valves should be capable of being serviced without draining down the system. 7.4 Discs Discs either shall be integral with the stem, or shall be attached to the stem in such a manner that they will lift when the valve is opened. 7.5 Handwheel The ha
48、ndwheel shall be attached to the stem by means of a metal nut or screw and shall either be integral with or separate from any shield. The direction of opening or closing, or both, shall be legibly marked on the handwheel or on a label attached to the handwheel. Figure 3 Typical gate pattern valveBS
49、2767:1991 8 BSI 03 December 2001 7.6 Tailpiece 7.6.1 The tailpiece shall have one end in the form of a seat to make contact with the valve body. This shall be in the form of a compression joint in accordance with BS 864-2 (see Figure 1) or a spherical design (see Figure 2 and Figure 3). The end for connection to the radiator shall have a tapered male thread complying with BS 21 or Figure 2 and Table 6 of BS 864-2:1983, or for radiators produced wit
