1、BRITISH STANDARD BS 7350:1990 Incorporating Amendment No.1 Specification for Double regulating globe valves and flow measurement devices for heating and chilled water systemsBS7350:1990 This British Standard, having been prepared under the direction of the Piping Systems Components Standards Policy
2、Committee, was published under the authority of the BoardofBSI and comes intoeffecton 28 October1990 BSI 07-1999 The following BSI references relate to the work on this standard: Committee reference PSE/7 Draft for comment 89/76940 DC ISBN 0 580 18850 7 Committees responsible for this British Standa
3、rd The preparation of this British Standard was entrusted by the Piping Systems Components Standards Policy Committee (PSE/-) to Technical Committee PSE/7, upon which the following bodies were represented: Amalgamated Engineering Union Associated Offices Technical Committee Association of Bronze and
4、 Brass Founders Association of Building Component Manufacturers British Chemical Engineering Contractors Association British Compressed Gases Association British Foundry Association British Gas plc British Maritime Technology British Plumbing Fittings Manufacturers Association British Valve and Actu
5、ator Manufacturers Association Chartered Institution of Building Services Engineers Copper Development Association Department of the Environment (Property Services Agency) Electricity Supply Industry in England and Wales Energy Industries Council Engineering Equipment and Materials Users Association
6、 GAMBICA (BEAMA Ltd.) Health and Safety Executive Institute of British Foundrymen Institution of Chemical Engineers Institution of Gas Engineers Institution of Mechanical Engineers Institution of Water and Environmental Management (IWEM) Society of British Gas Industries Water Companies Association
7、Water Services Association of England and Wales West Midlands CBI The following bodies were also represented in the drafting of the standard, through subcommittees and panels: Building Services Research and Information Association Institute of Refrigeration Amendments issued since publication Amd. N
8、o. Date Comments 6865 December 1991 Indicated by a sideline in the marginBS7350:1990 BSI 07-1999 i Contents Page Committees responsible Inside front cover Foreword ii 1 Scope 1 2 Definitions 1 3 Types 2 4 Ranges of nominal sizes 2 5 Ranges of nominal pressure 2 6 Pressure/temperature ratings 2 7 Dim
9、ensions and tolerances 3 8 Design 3 9 Materials 6 10 Hydraulic performance 6 11 Type testing 9 12 Production testing 9 13 Marking 10 14 Preparation for storage and transportation 11 15 Manufacturers certificate 11 Appendix A Information to be supplied by the purchaser 12 Appendix B Typical flow meas
10、urement device constructions 12 Appendix C Flow coefficient method of test 14 Figure 1 Type 1 flow measurement devices 12 Figure 2 Type 2 flow measurement devices 13 Figure 3 Type 3 flow measurement devices 13 Figure 4 Type 4 flow measurement devices 14 Figure 5 Typical test system 16 Figure 6 Test
11、section with test piece fitted 16 Figure 7 Test section without test piece fitted 17 Figure 8 Test section for flow measurement device only 17 Table 1 Ranges of nominal pressure (PN) 3 Table 2 Pressure/temperature ratings: flanged and threaded ends 4 Table 3 Pressure/temperature ratings: compression
12、 ends 4 Table 4 Face-to-face dimensions of flanged double regulating globe valves and flow measurement devices 4 Table 5 Hole diameters or slot widths of pressure tapping point or adaptor 5 Table 6 Materials for the manufacture of type1 flow measurement devices 7 Table 7 Range of system flow rates 8
13、 Table 8 Flow coefficient (K v ) for double regulating globe valves 8 Table 9 Flow coefficient (K vs ) for flow measurement devices 8 Table 10 Body material designation 11 Publications referred to 18BS7350:1990 ii BSI 07-1999 Foreword This British Standard has been prepared under the direction of th
14、e Piping Systems Components Standards Policy Committee. At the time of publication of this British Standard, no corresponding international standard exists. Double regulating globe valves, and fixed and variable orifice valves specified in this standard have been generally, but not exclusively, deve
15、loped from globe valves used for general purposes specified in BS5152 (for cast iron bodies), BS5154 (for copper alloy bodies) and BS5160 (for steel bodies). The materials specified for the valves in this standard are the same as those specified in BS5152, BS5154 and BS5160. The orifice plates speci
16、fied in this British Standard are distinct from the orifice plates specified in BS1042-1. The satisfactory performance of any valve or flow measurement device depends on design, manufacture, correct installation and maintenance. This standard does not specify selection, installation and maintenance
17、requirements, for which reference should be made to an appropriate guide or code of practice, e.g.BS6683, BS6880-1, BS6880-2 and BS6880-3, CIBSE Commissioning code series W, PSA Standard specification M b) threaded ends: 3/8, “, #, 1, 1!, 1“, 2; c) compression ends: 15 mm, 22 mm, 28 min. 5 Ranges of
18、 nominal pressure Double regulating globe valves and flow measurement devices shall be selected from the nominal pressure designations (PN) according to the valve body material and type of end connections as given in Table 1. NOTEType1 fixed orifice fittings for flange mounting may be suitable for a
19、 range of PN ratings. 6 Pressure/temperature ratings 6.1 All products, with the exception of those with non-metallic disks or components as given in6.2, shall have the pressure/temperature ratings appropriate to the body material as given in Table 2 or Table 3. type 1: a fixed orifice fitting (used
20、for measuring only). type 2: a fixed orifice valve (used for measuring and isolating only). type 3: a fixed orifice either integral with, or as a type 1 fixed orifice fitting close coupled to a double regulating globe valve (used for measuring, regulating and isolating). type 4: a variable orifice valve (used for measuring, regulating and isolating).
