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1、BS ISO 7714:2008 ICS 65.060.35 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BRITISH STANDARD Agricultural irrigation equipment Volumetric valves General requirements and test methods Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI
2、This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 May 2009 BSI 2009 ISBN 978 0 580 57145 9 Amendments/corrigenda issued since publication DateComments BS ISO 7714:2008 National foreword This British Standard is the UK implementation of ISO 7
3、714:2008. The UK participation in its preparation was entrusted to Technical Committee AGE/30, Irrigation and drainage equipment. A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisio
4、ns of a contract. Users are responsible for its correct application. Compliance with a British Standard cannot confer immunity from legal obligations. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 Reference number ISO 7714:2008(E) ISO 200
5、8 INTERNATIONAL STANDARD ISO 7714 Fourth edition 2008-09-01 Agricultural irrigation equipment Volumetric valves General requirements and test methods Matriel agricole dirrigation Vannes volumtriques Exigences gnrales et mthodes dessai Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, U
6、ncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) PDF disclaimer This PDF file may contain embedded typefaces. In accordance with Adobes licensing policy, this file may be printed or viewed but shall not be edited unless the typefaces which are embedded are licensed to and installed on the
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9、m the Central Secretariat at the address given below. COPYRIGHT PROTECTED DOCUMENT ISO 2008 All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic or mechanical, including photocopying and microfilm, without
10、permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyright office Case postale 56 CH-1211 Geneva 20 Tel. + 41 22 749 01 11 Fax + 41 22 749 09 47 E-mail copyrightiso.org Web www.iso.org Published in Switzerland ii ISO 2008 All rights
11、reserved Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) ISO 2008 All rights reserved iii Contents Page Foreword iv 1 Scope1 2 Normative references1 3 Terms and definitions .1 4 Classification .3 4.1 According to accuracy o
12、f cumulative volume counter .3 4.2 According to method of operation as a system of volumetric valves.3 5 Markings.4 6 Technical requirements4 6.1 General .4 6.2 Threaded and flanged connections.5 6.3 Metrological requirements5 7 Mechanical, functional and accuracy tests 6 7.1 General .6 7.2 Accuracy
13、 of measuring devices 6 7.3 Sampling and minimum acceptance requirements .7 7.4 Test of resistance to hydrostatic pressure.7 7.5 Test of manual opening and closing.8 7.6 Tests of accuracy 8 7.7 Pressure loss.9 7.8 Endurance tests.10 8 Information to be supplied by the manufacturer11 Annex A (informa
14、tive) Quality of irrigation water12 Bibliography13 Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) iv ISO 2008 All rights reserved Foreword ISO (the International Organization for Standardization) is a worldwide federation
15、of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. I
16、nternational organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization. International Standards are drafted in accordance with
17、 the rules given in the ISO/IEC Directives, Part 2. The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approva
18、l by at least 75 % of the member bodies casting a vote. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights. ISO 7714 was prepared by Technical Committee
19、ISO/TC 23, Tractors and machinery for agriculture and forestry, Subcommittee SC 18, Irrigation and drainage equipment and systems. This fourth edition cancels and replaces the third edition (ISO 7714:2000), which has been technically revised. Licensed CopyChinese University of Hong Kong, 13/06/2009
20、08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 INTERNATIONAL STANDARD ISO 7714:2008(E) ISO 2008 All rights reserved 1 Agricultural irrigation equipment Volumetric valves General requirements and test methods 1 Scope This International Standard specifies general requirements and test methods for
21、volumetric valves able to automatically deliver preset quantities of water. It is applicable to valves actuated by pipeline pressure and flow alone, and which do not need any other, external, source of energy. NOTE Volumetric valves are typically required to operate correctly with different qualitie
22、s of irrigation water at a variety of flow rates and at temperatures between 5 C and 50 C. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest editio
23、n of the referenced document (including any amendments) applies. ISO 7-1, Pipe threads where pressure-tight joints are made on the threads Part 1: Dimensions, tolerances and designation ISO 9644: Agricultural irrigation equipment Pressure losses in irrigation valves Test method 3 Terms and definitio
24、ns For the purposes of this document, the following terms and definitions apply. 3.1 volumetric valve valve capable of automatically delivering preset volumes of irrigation water at various flow rates, by measuring the volume of water flowing through the valve 3.2 serial volumetric valve volumetric
25、valve designed to operate in a sequence of volumetric valves 3.2.1 single outlet serial volumetric valve serial volumetric valve with one inlet and one outlet, intended for connection in parallel in a system of volumetric valves designed to be opened by means of a hydraulic command when preset to th
26、e open position and which, on closing after delivering a preset volume of water, transmits a hydraulic command to the next volumetric valve in the system to bring it into operation 3.2.2 single outlet “skip over” serial volumetric valve serial volumetric valve with one inlet and one outlet, intended
27、 for connection in parallel in a system of volumetric valves designed to be opened by means of a hydraulic command when preset to the open position and which, on closing after delivering a preset volume of water, skips over the next volumetric valve in the system and transmits a hydraulic command to
28、 the second next volumetric valve to bring it into operation Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) 2 ISO 2008 All rights reserved 3.2.3 dual outlet serial volumetric valve serial volumetric valve with one inlet an
29、d two outlets, normally open when the pressure at the inlet is the atmospheric pressure and designed so that, when a preset volume of water has passed through the first outlet, this outlet closes automatically, the second outlet opens automatically and all the flow is passed through the second outle
30、t to the next volumetric valve in the series 3.3 non-serial volumetric valve volumetric valve designed to operate alone 3.4 permanent flow rate qV3 highest flow rate under normal service conditions at which the volumetric valve can be operated in a satisfactory manner within the maximum permissible
31、error 3.5 overload flow rate qV4 highest flow rate at which the volumetric valve does not exceed the maximum permissible pressure loss and can be operated for a short period of time within its maximum permissible error, whilst maintaining its metrological performance when it is subsequently operated
32、 under normal service conditions 3.6 minimum flow rate qV1 lowest flow rate at which the volumetric valve can be operated within the maximum permissible error 3.7 range of flow rates flow rates ranging from the minimum flow rate to the overload flow rate, inclusive of limits 3.8 range of working flo
33、w rates flow rates ranging from the minimum flow rate to the permanent flow rate, inclusive of limits 3.9 relative error error, expressed as a percentage, defined by the equation: ia a 100 VV V = where Vi is the indicated volume; Va is the actual volume. ISO 4064-3:2005, definition 3.3 3.10 maximum
34、working pressure highest water pressure at the inlet to a volumetric valve at which it performs satisfactorily the functions specified by the manufacturer Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) ISO 2008 All rights
35、reserved 3 3.11 minimum working pressure lowest water pressure at the inlet to a volumetric valve at which it operates satisfactorily and performs the mechanical and hydraulic functions as specified by the manufacturer 3.12 range of working pressures all pressures ranging from the minimum working pr
36、essure to the maximum working pressure, inclusive of limits 3.13 nominal pressure highest pressure at the inlet to a volumetric valve at which the volumetric valve should be operated under normal service conditions, as specified by the manufacturer 3.14 accuracy the quality which characterizes the a
37、bility of a measuring instrument to give indications approximating to the true value of the quantity measured 3.15 uncertainty of measurement parameter associated with the result of a measurement, obtained using an appropriate mathematical formula which takes into account all sources of error, that
38、characterizes the dispersion of values that could reasonably be attributed to the measurement result 3.16 pattern approval certification bestowed by an authorized and accepted body, recognizing that the pattern of a measuring instrument conforms to the requirements of accepted International Standard
39、s 3.17 granulometry measure of the particle (grain) content of irrigation water, as characterized by size dispersion and total amount of solids 4 Classification 4.1 According to accuracy of cumulative volume counter Class 1: volumetric valve containing a control mechanism with a cumulative volume co
40、unter and having an accuracy of volume measurement of 2 %, within the range of flow rates. Class 2: volumetric valve containing a control mechanism with a cumulative volume counter and having an accuracy of volume measurement of 4 %, within the range of flow rates. Classes 1 and 2 are recommended fo
41、r water measurement in agricultural irrigation applications. Class 3: volumetric valve containing a preset volume mechanism but without a cumulative volume counter. 4.2 According to method of operation as a system of volumetric valves 4.2.1 Non-serial volumetric valve. Licensed CopyChinese Universit
42、y of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) 4 ISO 2008 All rights reserved 4.2.2 Serial volumetric valve: single outlet serial volumetric valve; single outlet “skip over” serial volumetric valve; dual outlet serial volumetric valve. NOTE The opening
43、 and closing commands of the water in the inlet of the first valve in the system can be either manual or automatic. 5 Markings Each volumetric valve shall bear clear and permanent markings including the following information: name of manufacturer or the manufacturers registered trademark; permanent
44、flow rate, qV3; ratio qV3/qV1; serial number; arrow indicating the direction of flow; arrow indicating the direction of setting of the control device, if necessary; nominal pressure; for serial volumetric valves, a mark identifying the points of connection for serial operation, which shall be explai
45、ned in the manufacturers catalogue; accuracy class (1, 2 or 3). 6 Technical requirements 6.1 General All parts of volumetric valves of the same size, type and model intended for disassembly, maintenance and repair produced by the same manufacturer shall be interchangeable. All parts of the volumetri
46、c valve shall be resistant to chemicals normally used in agriculture in their conventional concentrations, and shall operate smoothly for the water quality defined in 7.1. Upon request, the manufacturer shall supply information pertaining to the operation and safety of the valve with water of purity
47、 levels not conventionally found in agriculture, such as corrosive water. All non-metallic parts of the volumetric valves which are exposed to sunlight shall be protected against degradation from ultraviolet (UV) radiation under the normal operating conditions of the valve. Non-metallic parts of the
48、 valve which serve as water passages shall be opaque or shall be protected in some other manner (for instance, by a closed cover) against penetration of light to the water passages. The flow-control mechanism of the volumetric valve shall allow a means of manual override to stop the flow at any time
49、, such as returning the setting device to zero. Licensed CopyChinese University of Hong Kong, 13/06/2009 08:43, Uncontrolled Copy, (c) BSI BS ISO 7714:2008 ISO 7714:2008(E) ISO 2008 All rights reserved 5 6.2 Threaded and flanged connections In volumetric valves with threaded ends intended for direct connection to the pipeline, the thread shall comply with ISO 7-1. Alternatively, other threads may be allowed, provided that a suitable adapter in accordance with ISO 7-1 is supplie
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