BS ISO 6953-3-2013 Pneumatic fluid power Compressed air pressure regulators and filter-regulators Alternative test methods for measuring the flow-rate characteristics of pressure r.pdf

1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 6953-3:2013Pneumatic fluid power Compressed air pressureregulators and filter-regulatorsPart 3: Alternative test methods formeasuring the flow-rate characteristics ofpress

2、ure regulatorsBS ISO 6953-3:2013 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 6953-3:2013.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/5, Control components.A list of organizations represented on this committee can beo

3、btained on request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. The British Standards Institution 2013. Published by BSI StandardsLimited 2013ISBN 978 0 580 68215 5ICS 23.100.50Compliance wi

4、th a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 30 April 2013.Amendments issued since publicationDate Text affectedBS ISO 6953-3:2013 ISO 2012Pneumatic fluid power Compressed a

5、ir pressure regulators and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulatorsTransmissions pneumatiques Rgulateurs de pression et filtre-rgulateurs pour air comprim Partie 3: Mthodes dessai alternatives pour mesurer les caractristiqu

6、es de dbit des rgulateurs de pressionINTERNATIONAL STANDARDISO6953-3First edition2012-08-01Reference numberISO 6953-3:2012(E)BS ISO 6953-3:2013ISO 6953-3:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this public

7、ation 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 copyright officeCase postale 56 CH-1211 Geneva 2

8、0Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 6953-3:2013ISO 6953-3:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references .13 Terms and definitions .24 Symbols and units 25 Test

9、 installation 25.1 Test circuit .25.2 General requirements . 35.3 Isothermal tank (items 4 and 5) . 45.4 Special requirements . 46 Test procedures . 56.1 Test conditions . 56.2 Measuring procedures . 56.3 Calculation of characteristics 87 Presentation of test results 118 Identification statement .11

10、Annex A (informative) Examples of test results .12Annex B (informative) Various data processing methods .28Annex C (informative) Visualization of data processing procedures .37Annex D (informative) Illustrations of overshoot and undershoot on regulated pressure response and large variations on inlet

11、 pressure .40Bibliography .45BS ISO 6953-3:2013ISO 6953-3:2012(E)ForewordISO (the International Organization for 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 co

12、mmittees. 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 liaison with ISO, also take part in the work. ISO collaborates closely with th

13、e 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 technical committees is to prepare International Standards. Draft Internation

14、al 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 drawn to the possibility that some of the elements of this document may be the

15、 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 products and components.ISO 6953 consists of the following parts, under the general ti

16、tle 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 determine the main characteristics to be included in literature from supplier Part 3:

17、Alternative test methods for measuring the flow-rate characteristics of pressure regulatorsiv ISO 2012 All rights reservedBS ISO 6953-3:2013ISO 6953-3:2012(E)IntroductionThis part of ISO 6953 defines alternative test methods for flow-rate characteristics of pneumatic pressure control valves. These a

18、lternative 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 under test, into an isothermal tank. Relief flow-rate characteristics are obtained by p

19、assing 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 specified in ISO 6953-2:a) an air source with a large flow-rate capacity is not required;b) c

20、omponents with larger flow-rate capacity can be tested more easily;c) air consumption is minimized; andd) test time is shortened. ISO 2012 All rights reserved vBS ISO 6953-3:2013BS ISO 6953-3:2013Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 3: Alternative test

21、methods for measuring the flow-rate characteristics of pressure regulators1 ScopeThis part of ISO 6953 specifies alternative test methods for testing pneumatic fluid power components that use compressible fluids, i.e. gases. This part of ISO 6953 is applicable only to the decreasing flow rate part o

22、f 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 the response of pressure changes during charge and discharge tests; the pressure response

23、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 are given, as well as various data processing methods, and visualization of data processing pro

24、cedures. 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 air pressure regulators and filter-regulators according to ISO 6953-1; electro-pneumatic press

25、ure 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 referencesThe following referenced documents are indispensable for the application of this document. For dated references, on

26、ly 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 VocabularyISO 6358-1, Pneumatic fluid power Determination of flow-rate characteristics of components Part 1: General rul

27、es and test methods for steady-state flow1)ISO 6358-2, Pneumatic fluid power Determination of flow-rate characteristics of components Part 2: Alternative test methods1)ISO 6953-1, Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 1: Main characteristics to be includ

28、ed in literature from suppliers and product marking requirements1) 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 6953-2, Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 2: Test metho

29、ds to determine the main characteristics to be included in literature from suppliersISO 10094-2, Pneumatic fluid power Electro-pneumatic pressure control valves Part 2: Test methods to determine main characteristics to include in the suppliers literature3 Terms and definitionsFor the purposes of thi

30、s document, the terms and definitions given in ISO 5598, ISO 6358-1, ISO 6953-1 and ISO 10094-1 apply.4 Symbols and units4.1 The symbols and units shall be in accordance with ISO 6358-1 and ISO 6358-2, except for the pressure, p, given as the gauge stagnation pressure in this part of ISO 6953.4.2 Th

31、e subscripts to the symbols shall be in accordance with ISO 6358-1 and ISO 6358-2, except as given in Table 1.Table 1 SubscriptsSubscript Meaning1 Inlet conditions2 Outlet conditions3 Isothermal tank conditions4 Relief conditionsa Atmospheric conditionsu Upstream conditionsd Downstream conditionsf F

32、orward flow conditionsr Relief flow conditions4.3 The graphical symbols used in Figure 1 are in accordance with ISO 1219-1.5 Test installation5.1 Test circuitA suitable test circuit as shown in Figure 1 shall be used. The key of Figure 1 defines the test circuit components.NOTE Figure 1 illustrates

33、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 responsible for carrying out the test give due consideration to safeguarding both personnel and equipment.2 ISO 2012 All rights res

34、ervedBS ISO 6953-3:2013ISO 6953-3:2012(E)Key1 compressed gas source and filter 24 tank2 adjustable pressure regulator 25 adjustable pressure regulator3 shut-off valve 26, 27 solenoid valve, or manual valve4, 5 isothermal tank, in accordance with ISO 6358-2 28, 29 exhaust valve6, 7 temperature-measur

35、ing instrument 8, 9, 10 pressure-measuring tube, in accordance with ISO 6358-1p1inlet pressure11 component under test p2outlet pressure12, 13, 14, 15, 16 pressure transducer p3pressure in the isothermal tank17 digital recorder p4relief pressure18 barometer pusupply pressure19, 20 solenoid valve, bi-

36、directional flow type shall be used T3temperature in the isothermal tank21, 22, 23 transition connector, in accordance with ISO 6358-1 Figure 1 Test circuit5.2 General requirements5.2.1 The component under test shall be installed and operated in the test circuit in accordance with the manufacturers

37、operating instructions.5.2.2 A filter shall be installed which provides a standard of filtration specified by the manufacturer of the component 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,

38、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 accordance 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 no

39、t 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 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

40、 forward sonic conductance of the component under test. The upstream regulator 2 must be chosen to keep the inlet pressure, p1, in the range 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

41、 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 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 meas

42、ured 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 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 press

43、ure-measuring tube 10.5.2.12 solenoid valves 19 and 20 shall each have a rapid shifting time that ensures that test data collection 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

44、be small in order to shorten the testing time. The sonic conductance of solenoid valve 20 shall be at least four times as large as 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 foll

45、owing relation.VVpppudu21max(1)whereVuis the volume of tank 24 (m3);Vdis the volume of tank 4 (m3);puis the supply pressure (Pa);p1is the inlet pressure (Pa);p2maxis the maximum value of regulated pressure (Pa).5.2.15 For the places where liquid is collected, installation of a drain valve is preferr

46、ed.5.3 Isothermal tank (items 4 and 5)The structure, stuffed material and volume shall be in accordance with ISO 6358-2.5.4 Special requirementsThe 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 proc

47、edures6.1 Test conditions6.1.1 Gas supplyThe gas supply shall conform to the requirements of ISO 6358-1.6.1.2 ChecksThe checks shall be in accordance with ISO 6358-1.6.1.3 Test measurements6.1.3.1 Measurement shall be started only after steady-state conditions of temperature and pressure in the isot

48、hermal tank have been reached.6.1.3.2 Measurements shall be in conformance with Table 2 for the measurement accuracy and for the allowed test condition variation.Table 2 Measurement accuracy and allowed test condition variation of parametersParameter Measurement accuracy Allowed test condition varia

49、tionVolume 1 % Time 1 % Inlet pressure 0,5 % 1 %Tank pressure 0,5 % Regulated pressure 0,5 %0 % overshoot for charge test0 % undershoot for discharge testTemperature 1 K 3 K6.1.3.3 The phase lag between p1and p3shall be smaller than two sampling periods.6.1.4 Inlet and set pressures6.1.4.1 The inlet pressure used for testing shall be the lower of the maximum regulated pressure plus 200 kPa (2 bar), and the specified maximum inlet pressure.6.1.4.2 The set pressure shall be in accordance