BS-EN-60534-2-1-1999 IEC-60534-2-1-1998.pdf
《BS-EN-60534-2-1-1999 IEC-60534-2-1-1998.pdf》由会员分享,可在线阅读,更多相关《BS-EN-60534-2-1-1999 IEC-60534-2-1-1998.pdf(48页珍藏版)》请在三一文库上搜索。
1、BRITISH STANDARD BS EN 60534-2-1:1999 IEC 60534-2-1:1998 Incorporating Corrigendum No. 1 Industrial-process control valves Part 2-1: Flow capacity Sizing equations for fluid flow under installed conditions The European Standard EN 60534-2-1:1998 has the status of a British Standard ICS 23.060.40; 25
2、.040.40 ? Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60534-2-1:1999 This British Standard, having been prepared under the direction of the Electrotechnical Sector Committee, was published under the authority of the Standards Commi
3、ttee and comes into effect on 15 January 1999 BSI 15 July 2002 ISBN 0 580 32003 0 National foreword This British Standard is the official English language version of EN 60534-2-1:1998. It is identical with IEC 60534-2-1:1998, including Corrigendum February 2000. It cancels and replaces both BS EN 60
4、534-2-1:1993 and BS EN 60534-2-2:1993 which are withdrawn. The UK participation in its preparation was entrusted by Technical Committee GEL/65, Measurement and control, to Subcommittee GEL/65/2, Elements of systems, which has the responsibility to: A list of organizations represented on this subcomm
5、ittee can be obtained on request to its secretary. From 1 January 1997, all IEC publications have the number 60000 added to the old number. For instance, IEC 27-1 has been renumbered as IEC 60027-1. For a period of time during the change over from one numbering system to the other, publications may
6、contain identifiers from both systems. Cross-references The British Standards which implement international or European publications referred to in this document may be found in the BSI Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Search” faci
7、lity of the BSI Electronic Catalogue or of British Standards Online. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Compliance with a British Standard does not of itself confer immunity from legal obligation
8、s. aid enquirers to understand the text; present to the responsible international/European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed; monitor related international and European developments and promulgate them in the UK. Summary of pag
9、es This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 43 and a back cover. The BSI copyright notice displayed in this document indicates when the document was last issued. Amendments issued since publication Amd. No.DateComments 13586 Corrigen
10、dum No. 1 15 July 2002Replacement of equation (32a) and replacement of numerical constants N27 and N33 in Table 1 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI BS EN 60534-2-1:1999 BSI 15 July 2002 i Contents Page National forewordInside f
11、ront cover Foreword2 Text of EN 60534-2-13 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI ii blank Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EUROPEAN STANDARD NORME EUROPENNE
12、EUROPISCHE NORM EN 60534-2-1 October 1998 ICS 23.060.40; 25.040.40Supersedes EN 60534-2-1:1993 actual values shall be stated by the manufacturer. 2) Flow tends to open or close the valve, i.e. push the closure member away from or towards the seat. 3) Outward means flow from centre of cage to outside
13、, and inward means flow from outside of cage to centre. Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 BSI 15 July 2002 17 NOTE 1Pipe diameter D is the same size at both ends of the valve see equation (25). NOTE 2Refer to
14、Annex E for example of the use of these curves. Figure 2a Piping geometry factor Fp for Kv/d2 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 18 BSI 15 July 2002 NOTE 1Pipe diameter D is the same size at both ends of the va
15、lve see equation (25). NOTE 2Refer to Annex E for example of the use of these curves. Figure 2b Piping geometry factor Fp for Cv/d2 Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 BSI 15 July 2002 19 NOTECurves are based on
16、 FL being approximately 1,0. Figure 3 Reynolds number factor FR Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 20 BSI 15 July 2002 Figure 4a Double seated globe valves and cage guide globe valves (see legend) Figure 4b But
17、terfly valves and contoured small flow valve (see legend) Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 BSI 15 July 2002 21 NOTEThese values are typical only; actual values shall be stated by the manufacturer. Figure 4 Va
18、riation of FL with percent of rated C Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 22 BSI 15 July 2002 Figure 5 Liquid critical pressure ratio factor FF Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT
19、+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 BSI 15 July 2002 23 Annex A (informative) Derivation of valve style modifier Fd All variables in this annex have been defined in this part except for the following: The valve style modifier Fd, defined as the ratio dH/do at rated travel and w
20、here Ci/d2 0,016 N18, may be derived from flow tests using the following equation: For valves having Ci/d2?0,016 N18, Fd is calculated as follows: NOTEValues for N26 and N32 are listed in Table A.1. The test for determining Fd is covered in IEC 60534-2-3. Alternatively, Fd can be calculated by the f
21、ollowing equation: The hydraulic diameter dH of a single flow passage is determined as follows: The equivalent circular diameter do of the total flow area is given by the following equation: Fd may be estimated with sufficient accuracy from dimensions given in manufacturers drawings. Aoarea of vena
22、contracta of a single flow passage, millimetres squared; dHhydraulic diameter of a single flow passage, millimetres; diinside diameter of annular flow passage (see Figure A.1), millimetres; doequivalent circular diameter of the total flow area, millimetres; Dodiameter of seat orifice (see Figure A.1
23、 and Figure A.2), millimetres; Iwwetted perimeter of a single flow passage, millimetres; Nonumber of independent and identical flow passages of a trim, dimensionless; ?angular rotation of closure member (see Figure A.2), degrees; ?maximum angular rotation of closure member (see Figure A.2), degrees;
24、 ?B1velocity of approach factor, dimensionless; ?discharge coefficient, dimensionless. (A.1) (A.2) (A.3) (A.4) (A.5) Licensed Copy: sheffieldun sheffieldun, na, Thu Nov 09 08:29:27 GMT+00:00 2006, Uncontrolled Copy, (c) BSI EN 60534-2-1:1998 24 BSI 15 July 2002 The valve style modifier for a single-
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- BS-EN-60534-2-1-1999 IEC-60534-2-1-1998 BS EN 60534 1999 IEC 1998
链接地址:https://www.31doc.com/p-3744369.html