1、BSI Standards PublicationBS ISO 19973-4:2014Pneumatic fluid power Assessment of componentreliability by testingPart 4: Pressure regulatorsBS ISO 19973-4:2014 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 19973-4:2014.It supersedes BS ISO 19973-4:2007 which is
2、 withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18, Fluid power systems and components.A list of organizations represented on this committee can beobtained on request to its secretary.This publication does not purport to include all the necessaryprovisions
3、of a contract. Users are responsible for its correctapplication. The British Standards Institution 2014. Published by BSI StandardsLimited 2014ISBN 978 0 580 74866 0ICS 23.100.01Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under
4、the authority of theStandards Policy and Strategy Committee on 31 March 2014.Amendments issued since publicationDate Text affectedBS ISO 19973-4:2014 ISO 2014Pneumatic fluid power Assessment of component reliability by testing Part 4: Pressure regulatorsTransmissions pneumatiques valuation par essai
5、s de la fiabilit des composants Partie 4: Rgulateurs de pressionINTERNATIONAL STANDARDISO19973-4Second edition2014-03-01Reference numberISO 19973-4:2014(E)BS ISO 19973-4:2014ISO 19973-4:2014(E)ii ISO 2014 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2014All rights reserved. Unless otherwise s
6、pecified, 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 ISO at the address below o
7、r ISOs member body in the country of the requester.ISO copyright officeCase postale 56 CH-1211 Geneva 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightiso.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 19973-4:2014ISO 19973-4:2014(E) ISO 2014 All rights reserved iiiContents PageForewor
8、d ivIntroduction v1 Scope . 12 Normative references 13 Terms and definitions . 24 Symbols and units . 25 Test equipment. 25.1 Basic test equipment 25.2 Directional control valve 45.3 Volumes . 46 Test conditions . 46.1 General test conditions 46.2 Inlet and regulated pressures 57 Test procedure 57.1
9、 Timing of checks and measurements 57.2 Type and scope of checks and measurements . 57.3 Endurance test 58 Failure criteria and threshold levels . 78.1 General . 78.2 Functional failure 78.3 Failure due to leakage . 78.4 Failure due to pressure characteristics 78.5 Customised agreements 79 Data anal
10、ysis . 710 Test report . 811 Identification statement (reference to this part of ISO 19973) . 8Annex A (informative) Flow chart illustrating the test procedure specified in this part of ISO 19973 . 9Annex B (informative) Optional expanded test circuit .10Annex C (informative) Test data sheet .12Bibl
11、iography .16BS ISO 19973-4:2014ISO 19973-4:2014(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 committees. Each
12、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 the International
13、 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.The procedures used to develop this document and those intended for its further maintenance are described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the different ty
14、pes of ISO documents should be noted. This document was drafted in accordance with the editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives). Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not b
15、e held responsible for identifying any or all such patent rights. Details of any patent rights identified during the development of the document will be in the Introduction and/or on the ISO list of patent declarations received (see www.iso.org/patents). Any trade name used in this document is infor
16、mation given for the convenience of users and does not constitute an endorsement.For an explanation on the meaning of ISO specific terms and expressions related to conformity assessment, as well as information about ISOs adherence to the WTO principles in the Technical Barriers to Trade (TBT) see th
17、e following URL: Foreword - Supplementary informationThe committee responsible for this document is ISO/TC 131, Fluid power systems.This second edition cancels and replaces the first edition (ISO 19973-4:2007), which has been technically revised.ISO 19973 consists of the following parts, under the g
18、eneral title Pneumatic fluid power Assessment of component reliability by testing: Part 1: General procedures Part 2: Directional control valves Part 3: Cylinders with piston rod Part 4: Pressure regulatorsThe following part is under preparation: Part 5: Non-return valves, shuttle valves, dual press
19、ure valves (AND function), one-way adjustable flow control valves, quick-exhaust valvesiv ISO 2014 All rights reservedBS ISO 19973-4:2014ISO 19973-4:2014(E)IntroductionIn pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. Pneumatic fluid
20、 power systems are composed of components and are an integral part of various types of machines and equipment. Efficient and economical production requires highly reliable machines and equipment. Within the ISO 19973 series, this part is intended to provide requirements and test conditions that perm
21、it the assessment of the inherent reliability of pneumatic pressure regulators.It is necessary that machine producers know the reliability of the components that make up their machines pneumatic fluid power system. Knowing the reliability characteristic of the component, the producers can model the
22、system and make decisions on service intervals, spare parts inventory, and areas for future improvements.There are three primary levels in the determination of component reliability:a) preliminary design analysis finite element analysis (FEA), failure mode and effect analysis (FMEA);b) laboratory te
23、sting and reliability modelling physics of failure, reliability prediction, pre-production evaluation;c) collection of field data maintenance reports, warranty analysis.Each level has its application during the life of a component. A preliminary design analysis is useful to identify possible failure
24、 modes and eliminate them or reduce their effect on reliability. When prototypes are available, in-house laboratory reliability tests are run and initial reliability can be determined. Reliability testing is often continued into the initial production run and throughout the production lifetime as a
25、continuing evaluation of the component. Collection of field data is possible when products are operating and data on their failures are available. ISO 2014 All rights reserved vBS ISO 19973-4:2014BS ISO 19973-4:2014Pneumatic fluid power Assessment of component reliability by testing Part 4: Pressure
26、 regulators1 ScopeThis part of ISO 19973 provides test procedures for assessing the reliability of pneumatic pressure regulators by testing and the methods of reporting the results of testing. General test conditions and the calculation method are provided in ISO 19973-1. The methods specified in IS
27、O 19973-1 apply to the first failure, as obtained with the three-points moving average (3PMA) method, without repairs, but excluding outliers.The lifetime of pneumatic pressure regulators is usually given as a number of cycles. Therefore, whenever the term “time” is used in this part of ISO 19973, t
28、his variable shall be understood as either cycles or time.This part of ISO 19973 applies to manually adjustable and remote-piloted pressure regulators, both relieving and non-relieving. This part of ISO 19973 does not apply to pressure regulators that have a permanent bleed.This part of ISO 19973 al
29、so specifies test equipment and failure criteria (threshold levels) for tests to assess the reliability of pneumatic pressure regulators.The life determined by the method in this part of ISO 19973 and in ISO 19973-1 will be more closely related to applications that have a large variation in flow rat
30、e.NOTE See Annex A for a flow chart illustrating the test procedure specified in this part of ISO 19973.2 Normative referencesThe following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition ci
31、ted applies. For undated references, the latest edition of the referenced document (including any amendments) applies.ISO 1219-1, Fluid power systems and components Graphical symbols and circuit diagrams Part 1: Graphical symbols for conventional use and data-processing applicationsISO 5598, Fluid p
32、ower systems and components VocabularyISO 6953-1, Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 1: Main characteristics to be included in literature from suppliers and product-marking requirementsISO 6953-3, Pneumatic fluid power Compressed air pressure regulato
33、rs and filter-regulators Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulatorsISO 19973-1:1), Pneumatic fluid power Assessment of component reliability by testing Part 1: General proceduresISO 80000-1, Quantities and units Part 1: GeneralIEC 60050-191, I
34、nternational Electrotechnical Vocabulary. Chapter 191: Dependability and quality of service1) To be published. (Revision of ISO 19973-1:2007)INTERNATIONAL STANDARD ISO 19973-4:2014(E) ISO 2014 All rights reserved 1BS ISO 19973-4:2014ISO 19973-4:2014(E)3 Terms and definitionsFor the purposes of this
35、document, the terms and definitions given in ISO 5598, ISO 6953-1, ISO 19973-1, and IEC 60050-191 apply.NOTE Where a conflict of definitions exists for a term in any of these four documents, the following priority order shall apply: first, ISO 19973-1; second, ISO 6953-1; third, ISO 5598; and fourth
36、, IEC 60050-191.4 Symbols and units4.1 The units of measurement are in accordance with ISO 80000-1.4.2 The graphic symbols used in this part of ISO 19973 conform to the requirements of ISO 1219-1.5 Test equipment5.1 Basic test equipment5.1.1 Each pressure regulator to be tested (test unit) shall be
37、installed in a test circuit that includes the components shown in either Figure 1 or Figure 2. Multiple test circuits can use the same source of compressed air; if this is the case, each test circuit shall be composed of identical components. Annex B describes an optional expanded test circuit that
38、incorporates additional components to isolate measuring instruments.Figure 1 illustrates a basic circuit that does not incorporate all 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 c
39、onsideration to safeguarding both personnel and equipment.2 ISO 2014 All rights reservedBS ISO 19973-4:2014ISO 19973-4:2014(E)Key1 supply2 pressure gauge for measuring pressure, p13 five-port, two-position directional control valve4 silencer5 pressure regulator under test (i.e. test unit) (example)6
40、 volume7 pressure gauge or transducer for measuring pressure, p28 pressure gauge or transducer for measuring pressure, p39 shut-off valve or quick-action couplingFigure 1 Test circuit5.1.2 An alternative test circuit in accordance with Figure 2 can also be used, if the five-port, two-position direct
41、ional control valve (key item 3 in Figure 1) is too large. In this circuit, the two-port, two-position directional control valves shall be operated simultaneously. ISO 2014 All rights reserved 3BS ISO 19973-4:2014ISO 19973-4:2014(E)Key1 supply2 pressure gauge for measuring pressure, p13 two-port, tw
42、o-position directional control valve (NC, normally closed)4 two-port, two-position directional control valve (NO, normally open)5 silencer6 pressure regulator under test (example)7 volume8 pressure gauge or transducer for measuring pressure, p29 pressure gauge or transducer for measuring pressure, p
43、310 shut-off valve or quick-action couplingFigure 2 Alternative test circuit5.1.3 If the body of the test unit has ports of two or three different sizes, use the largest port size.5.1.4 Before installing the test units, perform a forward flow test on them in accordance with ISO 6953-3. Determine the
44、 forward sonic conductance, Cf, of each test unit in accordance with ISO 6953-3.5.1.5 Install pressure measuring instruments (gauges or transducers) into the test circuit as shown in Figure 1 (key items 2, 7, and 8) or Figure 2 (key items 2, 8, and 9), using either quick action couplings or shut-off
45、 valves (key item 9 in Figure 1 and key item 10 in Figure 2).5.2 Directional control valveAn external pilot type or direct-operated type of directional control valve is used in the test circuit. The sonic conductance, C, of the directional control valve used shall be greater than or equal to the Cfv
46、alue measured for the test unit in 5.1.4. The size of the directional control valve shall also ensure that the requirements of 7.3.1 b) will be fulfilled.5.3 VolumesVolumes 6 or 7, in Figures 1 and 2 respectively, shall be sized as described in Table 3 of ISO 19973-1:.6 Test conditions6.1 General te
47、st conditionsGeneral test conditions shall be in accordance with ISO 19973-1.4 ISO 2014 All rights reservedBS ISO 19973-4:2014ISO 19973-4:2014(E)6.2 Inlet and regulated pressures6.2.1 The inlet pressure to the test unit shall be 800 kPa 40 kPa, or the maximum rated inlet pressure, if it is less than
48、 this value.6.2.2 The regulated pressure set point shall be 80 % (5 %) of the inlet pressure or 80 % (5 %) of the manufacturers rated maximum regulated pressure, whichever is lower (see Figure 3). When obtaining this setting, the adjustment shall be made while regulated pressure is increasing. If th
49、e pressure exceeds the desired set point during this process, the pressure shall be reduced well below the desired set point and adjusted again while regulated pressure is increasing. The set point shall never be obtained while regulated pressure is decreasing.6.2.3 To compensate for initial drift before starting the test, carefully readjust the set point of the test unit to the conditions described in 6.2.2 after 24 h of continuous cycling. Record this reset pressure as the initial set pressure.7 Tes
