1、 IEC 60534-2-4Edition 2.0 2009-05INTERNATIONAL STANDARD NORME INTERNATIONALEIndustrial-process control valves Part 2-4: Flow capacity Inherent flow characteristics and rangeability Vannes de rgulation des processus industriels Partie 2-4: Capacit dcoulement Caractristiques intrinsques de dbit et coe
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16、ez des questions, visitez le FAQ du Service clients ou contactez-nous: Email: csciec.ch Tl.: +41 22 919 02 11 Fax: +41 22 919 03 00 IEC 60534-2-4Edition 2.0 2009-05INTERNATIONAL STANDARD NORME INTERNATIONALEIndustrial-process control valves Part 2-4: Flow capacity Inherent flow characteristics and r
17、angeability Vannes de rgulation des processus industriels Partie 2-4: Capacit dcoulement Caractristiques intrinsques de dbit et coefficient intrinsque de rglage INTERNATIONAL ELECTROTECHNICAL COMMISSION COMMISSION ELECTROTECHNIQUE INTERNATIONALE KICS 23.060.40; 25.040.40 PRICE CODECODE PRIXISBN 2-83
18、18-1039-1 Registered trademark of the International Electrotechnical Commission Marque dpose de la Commission Electrotechnique Internationale 2 60534-2-4 IEC:2009 INTERNATIONAL ELECTROTECHNICAL COMMISSION _ INDUSTRIAL-PROCESS CONTROL VALVES Part 2-4: Flow capacity Inherent flow characteristics and r
19、angeability FOREWORD 1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising all national electrotechnical committees (IEC National Committees). The object of IEC is to promote international co-operation on all questions concerning standardiz
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27、tional Committees for any personal injury, property damage or other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC Publications. 8) Attention
28、 is drawn to the Normative references cited in this publication. Use of the referenced publications is indispensable for the correct application of this publication. 9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of patent rights. IEC sh
29、all not be held responsible for identifying any or all such patent rights. International Standard IEC 60534-2-4 has been prepared by subcommittee 65B: Devices and process analysis, of IEC technical committee 65: Industrial-process measurement, control and automation. This second edition cancels and
30、replaces the first edition published in 1989. This edition constitutes a technical revision. The main changes with respect to the previous edition are listed below. This standard has been revised to: a) update the normative references; b) delete the terminology included in IEC 60534-1; c) transform
31、the previous Note 1 in Clause 6; d) redraw the graphics; e) delete the previous Figure 3. 60534-2-4 IEC:2009 3 The text of this standard is based on the following documents: FDIS Report on voting 65B/704/FDIS 65B/713/RVDFull information on the voting for the approval of this standard can be found in
32、 the report on voting indicated in the above table. This publication has been drafted in accordance with the ISO/IEC Directives, Part 2. A list of all parts of IEC 60534 series, under the general title Industrial-process control valves, can be found on the IEC website. The committee has decided that
33、 the contents of this publication will remain unchanged until the maintenance result date indicated on the IEC web site under “http:/webstore.iec.ch“ in the data related to the specific publication. At this date, the publication will be reconfirmed; withdrawn; replaced by a revised edition; or amend
34、ed. 4 60534-2-4 IEC:2009 INDUSTRIAL-PROCESS CONTROL VALVES Part 2-4: Flow capacity Inherent flow characteristics and rangeability 1 Scope This part of IEC 60534 applies to all types of industrial-process control valves. It defines how to state typical control valve inherent flow characteristics and
35、inherent rangeabilities. It also defines how to establish criteria for adherence to manufacturer-stated flow characteristics. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For un
36、dated references, the latest edition or the referenced document (including any amendments) applies. IEC 60534-1:2005, Industrial-process control valves Part 1: Control valve terminology and general considerations IEC 60534-2-3, Industrial-process control valves Part 2-3: Flow capacity Test procedure
37、s 3 Terms and definitions For the purposes of this document, the terms and definitions given in IEC 60534-1 and the following apply. 3.1 flow coefficient (see IEC 60534-1, 4.6) 3.2 rated flow coefficient (see IEC 60534-1, 4.6.3) 3.3 relative flow coefficient () 0is the relative flow coefficient at 0
38、 % relative travel IEC 60534-1, 4.9 modified 3.4 travel (see IEC 60534-1, 4.5.2) 3.5 rated travel (see IEC 60534-1, 4.5.3) 3.6 relative travel (h) (see IEC 60534-1, 4.5.4) 60534-2-4 IEC:2009 5 3.7 nominal slope slope of the best fit line for an ideal inherent linear flow characteristic, the nominal
39、slope is: m with hm0 = for an ideal inherent equal percentage flow characteristic, the nominal slope is: n with =01logn 3.8 inherent flow characteristic (see IEC 60534-1, 4.9) 3.8.1 ideal inherent linear flow characteristic (see IEC 60534-1, 4.9.1) 3.8.2 ideal inherent equal percentage flow characte
40、ristic (see IEC 60534-1, 4.9.2) 3.9 inherent rangeability ratio of the largest flow coefficient (max) to the smallest flow coefficient (min) within which the deviation from the stated inherent flow characteristic does not exceed the allowable deviation stated in Clause 7 IEC 60534-1, 4.11 modified 4
41、 Symbols Table 1 gives an overview of the symbols used in this standard. Table 1 Symbols Symbol Description Unit Relative flow coefficient Dimensionless C Flow coefficient (Kv, Cv) Various (see IEC 60534-1) CRFlow coefficient (Kvand Cv) at rated travel Various (see IEC 60534-1) d Nominal valve diame
42、ter mm h Relative travel Dimensionless 6 60534-2-4 IEC:2009 5 Typical inherent flow characteristics The typical inherent flow characteristics and the values of n, m and 0 for a specific size, type and trim configuration of a control valve shall be stated by the manufacturer either graphically or in
43、tabular form. When tabulated, specific flow coefficients shall be stated for the following travel positions: at 5 %, 10 %, 20 %, and every subsequent 10 % of rated travel up to and including 100 % (see Figures 1 and 2). The manufacturer may publish flow coefficients in addition to those at the above
44、 stated travel positions. In addition, the manufacturer is encouraged to specify the generic name of a specific flow characteristic, such as “linear“ or “equal percentage“, if applicable, following the terms and definitions of IEC 60534-1. The manufacturer shall state the largest flow coefficient th
45、at meets the criteria of Clause 7, if it is less than the rated flow coefficient (see Figures 1 and 2). 60534-2-4 IEC:2009 7 h 0,0 100 0,1 000 1,0 000 0 0,1 0,2 0,3 0,4 0,5 0,6 0,7 0,8 0,9 1,0 DCEAB IEC 574/09 Key A tolerance band B minimum within tolerance band and slope requirements (0,025 3) C va
46、lve specimen test points D manufacturer stated characteristic E maximum within slope requirements (1,0) h relative travel relative flow Inherent rangeability of test specimen: 39,530,0251,000minmax=Figure 1 Example of an equal percentage characteristic valve specimen compared to manufacturer-stated
47、flow characteristic 8 60534-2-4 IEC:2009 0,00 0,10 0,20 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00 0,00 0,10 0,20 0,30 0,40 0,50 0,60 0,70 0,80 0,90 1,00 0,00 0,01 0,02 0,00 0,04 0,06 0,08 0,10 h B DA C E F IEC 575/09 Key A tolerance band B minimum within tolerance band (0,004 1) C valve specimen test
48、points D manufacturer stated characteristic E major deviation F maximum within slope requirements (0,89) h relative travel relative flow Inherent rangeability of test specimen: 21710,0040,89minmax=Figure 2 Example of linear characteristic valve specimen compared to manufacturer-stated flow character
49、istic 60534-2-4 IEC:2009 9 6 Inherent rangeability The stated inherent rangeability of a specific control valve is related solely to the interaction between the closure member and the flow control orifice of a valve. This given value may not be applicable when the control valve is installed. Other factors such as the positioning
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