BS ISO 6358-2-2013 en_4367 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Alternative test methods《气压传动 使用可压缩流体组件的流速特性测定 替代试验方法》.pdf
《BS ISO 6358-2-2013 en_4367 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Alternative test methods《气压传动 使用可压缩流体组件的流速特性测定 替代试验方法》.pdf》由会员分享,可在线阅读,更多相关《BS ISO 6358-2-2013 en_4367 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Alternative test methods《气压传动 使用可压缩流体组件的流速特性测定 替代试验方法》.pdf(54页珍藏版)》请在麦多课文档分享上搜索。
1、BSI Standards Publication BS ISO 6358-2:2013 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Part 2: Alternative test methodsBS ISO 6358-2:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6358-2:201
2、3. Together with BS ISO 6358-1:2013 and BS ISO 6358-3, it supersedes BS 7294:1990 (dual numbered as ISO 6358:1989), which will be withdrawn on publication of Part 3. The UK participation in its preparation was entrusted by Technical Committee MCE/18, Fluid power systems and components, to Subcommitt
3、ee MCE/18/-/5, Control components. A list of organizations represented on this subcommittee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. The British Standards I
4、nstitution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 61665 5 ICS 23.100.01 Compliance with a British Standard cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 November 2013.
5、Amendments/corrigenda issued since publication Date Text affectedBS ISO 6358-2:2013 ISO 2013 Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Part 2: Alternative test methods Transmissions pneumatiques Dtermination des caractristiques de dbit d
6、es composants traverss par un fluide compressible Partie 2: Mthodes dessai alternatives INTERNATIONAL STANDARD ISO 6358-2 First edition 2013-05-01 Reference number ISO 6358-2:2013(E)BS ISO 6358-2:2013ISO 6358-2:2013(E)ii ISO 2013 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2013 All rights r
7、eserved. Unless otherwise specified, no part of this publication may be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting on the internet or an intranet, without prior written permission. Permission can be requested from either
8、 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 SwitzerlandBS ISO 6358-2:2013ISO 6358-2:2013(E) ISO 2013 All rights
9、reserved iii Contents Page Foreword iv Introduction v 1 Scope . 1 2 Normative references 2 3 Terms and definitions . 2 4 Symbols and units . 2 5 Test installation . 2 5.1 Test circuit for discharge test . 3 5.2 Test circuit for charge test . 3 5.3 General requirements . 4 5.4 Requirements for the ta
10、nk (item 4) 5 5.5 Special requirements . 7 6 Test procedures . 8 6.1 Test conditions 8 6.2 Measuring procedures 9 6.3 Calculation of characteristics 12 7 Presentation of test results 16 8 Identification statement (reference to this part of ISO 6358) 17 Annex A (informative) Evaluation of measurement
11、 uncertainty .18 Annex B (normative) Test method to determine and calibrate the volume of an isothermal tank .24 Annex C (informative) Isothermal tank stuffing 30 Annex D (informative) Test method to determine isothermal performance 33 Annex E (informative) Equations for calculation of flow-rate cha
12、racteristics .36 Annex F (informative) Procedures for calculating critical back-pressure ratio, b, and subsonic index, m, by the least-square method using the Solver function in Microsoft Excel .39 Bibliography .43BS ISO 6358-2:2013ISO 6358-2:2013(E) Foreword ISO (the International Organization for
13、Standardization) is a worldwide federation 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 r
14、ight to be represented on that committee. International 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. Internation
15、al Standards are drafted in accordance with 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
16、 an International Standard requires approval 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. IS
17、O 6358-2 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5, Control products and components. This first edition of ISO 6358-2, together with ISO 6358-1 and ISO 6358-3, cancels and replaces ISO 6358:1989, which has been technically revised. However, ISO 6358-2 and
18、 ISO 6358-3 are new standards whose scopes were not included in ISO 6358:1989. ISO 6358 consists of the following parts, under the general title Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids: Part 1: General rules and test methods for steady
19、-state flow Part 2: Alternative test methods Part 3: Method for calculating steady-state flow-rate characteristics of assembliesiv ISO 2013 All rights reservedBS ISO 6358-2:2013ISO 6358-2:2013(E) Introduction In pneumatic fluid power systems, power is transmitted and controlled through a gas under p
20、ressure within a circuit. Components that make up such a circuit are inherently resistive to the flow of the gas and it is necessary, therefore, to define and determine the flow-rate characteristics that describe their performance. ISO 6358:1989 was developed to determine the flow-rate characteristi
21、cs of pneumatic valves, based upon a model of converging nozzles. The method included two characteristic parameters: sonic conductance, C, and critical pressure ratio, b, used in a proposed mathematical approximation of the flow behaviour. The result described flow performance of a pneumatic valve f
22、rom choked flow to subsonic flow, based on static pressure. This new edition uses stagnation pressure instead, to take into account the influence of flow velocity on the measurement of pressures. Experience has demonstrated that many pneumatic valves have convergingdiverging characteristics that do
23、not fit the ISO 6358:1989 model very well. Furthermore, new developments have allowed the application of this method to additional components beyond pneumatic valves. However, this now requires the use of four parameters (C, b, m, and p c ) to define the flow performance in both the choked and subso
24、nic flow regions. This part of ISO 6358 describes a set of three flow-rate characteristic parameters determined from test results. These parameters are described as follows and are listed in decreasing order of priority: The sonic conductance, C, corresponding to the maximum flow rate (choked) is th
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