1、raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS ISO 6953-3:2013 Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics
2、of pressure regulatorsBS ISO 6953-3:2013 BRITISH STANDARD National foreword This British Standard is the UK implementation of ISO 6953-3:2013. The UK participation in its preparation was entrusted to Technical Committee MCE/18/-/5, Control components. A list of organizations represented on this comm
3、ittee 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 Institution 2013. Published by BSI Standards Limited 2013 ISBN 978 0 580 68215 5 ICS 23
4、.100.50 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 April 2013. Amendments issued since publication Date Text affectedBS ISO 6953-3:2013 ISO 2012 Pneumat
5、ic fluid power Compressed air pressure regulators and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators Transmissions pneumatiques Rgulateurs de pression et filtre- rgulateurs pour air comprim Partie 3: Mthodes dessai alternatives p
6、our mesurer les caractristiques de dbit des rgulateurs de pression INTERNATIONAL STANDARD ISO 6953-3 First edition 2012-08-01 Reference number ISO 6953-3:2012(E)BS ISO 6953-3:2013ISO 6953-3:2012(E) ii ISO 2012 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2012 All rights reserved. Unless othe
7、rwise 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 permission in writing from either ISO at the address below or ISOs member body in the country of the requester. ISO copyrigh
8、t 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 6953-3:2013ISO 6953-3:2012(E) ISO 2012 All rights reserved iii Contents Page Foreword iv Introduction v 1 Scope 1 2 Normative references . 1
9、3 Terms and definitions . 2 4 Symbols and units 2 5 Test installation 2 5.1 Test circuit . 2 5.2 General requirements . 3 5.3 Isothermal tank (items 4 and 5) . 4 5.4 Special requirements . 4 6 Test procedures . 5 6.1 Test conditions . 5 6.2 Measuring procedures . 5 6.3 Calculation of characteristics
10、 8 7 Presentation of test results 11 8 Identification statement . 11 Annex A (informative) Examples of test results .12 Annex B (informative) Various data processing methods .28 Annex C (informative) Visualization of data processing procedures .37 Annex D (informative) Illustrations of overshoot and
11、 undershoot on regulated pressure response and large variations on inlet pressure .40 Bibliography .45BS ISO 6953-3:2013ISO 6953-3:2012(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of prepari
12、ng 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. International organizations, governmental and non-governmental, in lia
13、ison 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 the rules given in the ISO/IEC Directives, Part 2. The main task of
14、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 approval by at least 75 % of the member bodies casting a vote. Attention is
15、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 6953-3 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5, Control product
16、s and components. ISO 6953 consists of the following parts, under the general title Pneumatic fluid power Compressed air pressure regulators and filter-regulators: Part 1: Main characteristics to be included in literature from suppliers and product-marking requirements Part 2: Test methods to determ
17、ine the main characteristics to be included in literature from supplier Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators iv ISO 2012 All rights reservedBS ISO 6953-3:2013ISO 6953-3:2012(E) Introduction This part of ISO 6953 defines alternative test
18、methods for flow-rate characteristics of pneumatic pressure control valves. These alternative test methods do not use a flow meter but, instead, use an isothermal tank. These methods measure the forward flow-rate characteristics by passing compressed air from a charged tank through the regulator und
19、er test, into an isothermal tank. Relief flow-rate characteristics are obtained by passing compressed air from an isothermal tank, through the regulator under test, and out to the atmosphere. The test methods specified in this part of ISO 6953 have the following advantages over test methods specifie
20、d in ISO 6953-2: a) an air source with a large flow-rate capacity is not required; b) components with larger flow-rate capacity can be tested more easily; c) air consumption is minimized; and d) test time is shortened. ISO 2012 All rights reserved vBS ISO 6953-3:2013BS ISO 6953-3:2013Pneumatic fluid
21、 power Compressed air pressure regulators and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators 1 Scope This part of ISO 6953 specifies alternative test methods for testing pneumatic fluid power components that use compressible flui
22、ds, i.e. gases. This part of ISO 6953 is applicable only to the decreasing flow rate part of the hysteresis curve of forward flow and relief flow characteristics. This method can be applied when: the pressure regulation dynamics of a component under test is rapid enough to be negligible, compared to
23、 the response of pressure changes during charge and discharge tests; the pressure response does not show any overshoot or any oscillating behaviour. This part of ISO 6953 specifies requirements for the test installation, the test procedure and the presentation of results. Examples of test results ar
24、e given, as well as various data processing methods, and visualization of data processing procedures. Illustrations of overshoot and undershoot on regulated pressure response and large variations on inlet pressure are also given. This part of ISO 6953 applies to the following components: compressed
25、air pressure regulators and filter-regulators according to ISO 6953-1; electro-pneumatic pressure control valves according to ISO 10094; other components such as relief valves. NOTE If pressure regulation characteristics are needed, ISO 6953-2 is applicable. 2 Normative references The following refe
26、renced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 5598, Fluid power systems and components Vocabulary ISO 6358-1,
27、 Pneumatic fluid power Determination of flow-rate characteristics of components Part 1: General rules and test methods for steady-state flow 1) ISO 6358-2, Pneumatic fluid power Determination of flow-rate characteristics of components Part 2: Alternative test methods 1) ISO 6953-1, Pneumatic fluid p
28、ower Compressed air pressure regulators and filter-regulators Part 1: Main characteristics to be included in literature from suppliers and product marking requirements 1) To be published. INTERNATIONAL STANDARD ISO 6953-3:2012(E) ISO 2012 All rights reserved 1BS ISO 6953-3:2013ISO 6953-3:2012(E) ISO
29、 6953-2, Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 2: Test methods to determine the main characteristics to be included in literature from suppliers ISO 10094-2, Pneumatic fluid power Electro-pneumatic pressure control valves Part 2: Test methods to determin
30、e main characteristics to include in the suppliers literature 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598, ISO 6358-1, ISO 6953-1 and ISO 10094-1 apply. 4 Symbols and units 4.1 The symbols and units shall be in accordance with ISO 6358-1 and
31、 ISO 6358-2, except for the pressure, p, given as the gauge stagnation pressure in this part of ISO 6953. 4.2 The subscripts to the symbols shall be in accordance with ISO 6358-1 and ISO 6358-2, except as given in Table 1. Table 1 Subscripts Subscript Meaning 1 Inlet conditions 2 Outlet conditions 3
32、 Isothermal tank conditions 4 Relief conditions a Atmospheric conditions u Upstream conditions d Downstream conditions f Forward flow conditions r Relief flow conditions 4.3 The graphical symbols used in Figure 1 are in accordance with ISO 1219-1. 5 Test installation 5.1 Test circuit A suitable test
33、 circuit as shown in Figure 1 shall be used. The key of Figure 1 defines the test circuit components. NOTE Figure 1 illustrates the basic circuit which does not incorporate all of the safety devices necessary to protect against damage in the event of component failure. It is important that those res
34、ponsible for carrying out the test give due consideration to safeguarding both personnel and equipment. 2 ISO 2012 All rights reservedBS ISO 6953-3:2013ISO 6953-3:2012(E) Key 1 compressed gas source and filter 24 tank 2 adjustable pressure regulator 25 adjustable pressure regulator 3 shut-off valve
35、26, 27 solenoid valve, or manual valve 4, 5 isothermal tank, in accordance with ISO 6358-2 28, 29 exhaust valve 6, 7 temperature-measuring instrument 8, 9, 10 pressure-measuring tube, in accordance with ISO 6358-1 p 1 inlet pressure 11 component under test p 2 outlet pressure 12, 13, 14, 15, 16 pres
36、sure transducer p 3 pressure in the isothermal tank 17 digital recorder p 4 relief pressure 18 barometer p u supply pressure 19, 20 solenoid valve, bi-directional flow type shall be used T 3 temperature in the isothermal tank 21, 22, 23 transition connector, in accordance with ISO 6358-1 Figure 1 Te
37、st circuit 5.2 General requirements 5.2.1 The component under test shall be installed and operated in the test circuit in accordance with the manufacturers operating instructions. 5.2.2 A filter shall be installed which provides a standard of filtration specified by the manufacturer of the component
38、 under test. 5.2.3 The test circuit of Figure 1 shall be constructed from the items listed in the key of Figure 1. Items 1, 2, 3, 4, 6, 8, 9, 11, 12, 13, 15, 17, 18, 19, 21, 22, 24, 25, 26 and 28 inclusive are essential, and the remaining items 5, 7, 10, 14, 16, 20, 23, 27 and 29 can be chosen in ac
39、cordance with 5.2.4 and 5.2.13. 5.2.4 Items 10, 14, 23 are not required for a component under test that does not have a relief port, or when the mounting is not possible. 5.2.5 The sonic conductance of solenoid valve 19 shall be about four times as large as that of the component under test. ISO 2012
40、 All rights reserved 3BS ISO 6953-3:2013ISO 6953-3:2012(E) 5.2.6 The sonic conductance of adjustable pressure regulator 2 shall be at least twice as large as the forward sonic conductance of the component under test. The upstream regulator 2 must be chosen to keep the inlet pressure, p 1 , in the ra
41、nge of 1 % of the pressure specified in 6.1.4.1. See 6.3.3 and Annex D.2. 5.2.7 The distance between pressure-measuring tube 9 and isothermal tanks 4 and 5 shall be as short as possible. 5.2.8 Pressure-measuring tubes 8, 9 and 10, and transition connectors 21, 22 and 23, shall be made in accordance
42、with ISO 6358-1. It is not necessary to have a temperature-measuring connection in the pressure- measuring tubes because, in this test method, the temperature is measured in the isothermal tank. 5.2.9 Pressure transducer 12 shall be connected to the pressure tap of pressure-measuring tube 8. 5.2.10
43、Pressure transducer 13 shall be connected to the pressure tap of pressure-measuring tube 9. 5.2.11 Pressure transducer 14 shall be connected to the pressure tap of pressure-measuring tube 10. 5.2.12 solenoid valves 19 and 20 shall each have a rapid shifting time that ensures that test data collectio
44、n starts after solenoid valves 19 and 20 each shift. 5.2.13 When the relief capacity of the component under test is very small, the size of components 5, 20 and 27 should be small in order to shorten the testing time. The sonic conductance of solenoid valve 20 shall be at least four times as large a
45、s the relief sonic conductance of the component under test. 5.2.14 The volume of the tank 24, or supply pressure from an air source should be determined to satisfy the following relation. (1) where V u is the volume of tank 24 (m 3 ); V d is the volume of tank 4 (m 3 ); p u is the supply pressure (P
46、a); p 1 is the inlet pressure (Pa); p 2max is the maximum value of regulated pressure (Pa). 5.2.15 For the places where liquid is collected, installation of a drain valve is preferred. 5.3 Isothermal tank (items 4 and 5) The structure, stuffed material and volume shall be in accordance with ISO 6358
47、-2. 5.4 Special requirements The special requirements shall be in accordance with ISO 6358-1 and ISO 6358-2. 4 ISO 2012 All rights reservedBS ISO 6953-3:2013ISO 6953-3:2012(E) 6 Test procedures 6.1 Test conditions 6.1.1 Gas supply The gas supply shall conform to the requirements of ISO 6358-1. 6.1.2
48、 Checks The checks shall be in accordance with ISO 6358-1. 6.1.3 Test measurements 6.1.3.1 Measurement shall be started only after steady-state conditions of temperature and pressure in the isothermal tank have been reached. 6.1.3.2 Measurements shall be in conformance with Table 2 for the measureme
49、nt accuracy and for the allowed test condition variation. Table 2 Measurement accuracy and allowed test condition variation of parameters Parameter Measurement accuracy Allowed test condition variation Volume 1 % Time 1 % Inlet pressure 0,5 % 1 % Tank pressure 0,5 % Regulated pressure 0,5 % 0 % overshoot for charge test 0 % undershoot for discharge test Temperature 1 K 3 K 6.1.3.3 The phase lag between p 1and p 3shall be smaller than two samp
