1、BSI Standards Publication BS ISO 6953-2:2015 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 suppliersBS ISO 6953-2:2015 BRITISH STANDARD National foreword This British Standar
2、d is the UK implementation of ISO 6953-2:2015. It supersedes BS ISO 6953-2:2000 which is withdrawn. The UK participation in its preparation was entrusted to Technical Committee MCE/18/-/5, Control components. A list of organizations represented on this committee can be obtained on request to its sec
3、retary. 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 2015. Published by BSI Standards Limited 2015 ISBN 978 0 580 76264 2 ICS 23.100.50 Compliance with a British Standard
4、cannot confer immunity from legal obligations. This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 March 2015. Amendments/corrigenda issued since publication Date T e x t a f f e c t e dBS ISO 6953-2:2015 ISO 2015 Pneumatic fluid power Compres
5、sed air pressure regulators and filter-regulators Part 2: Test methods to determine the main characteristics to be included in literature from suppliers Transmissions pneumatiques Rgulateurs de pression et filtres- rgulateurs pour air comprim Partie 2: Mthodes dessai pour dterminer les principales c
6、aractristiques inclure dans la documentation des fournisseurs INTERNATIONAL STANDARD ISO 6953-2 Second edition 2015-03-01 Reference number ISO 6953-2:2015(E)BS ISO 6953-2:2015ISO 6953-2:2015(E)ii ISO 2015 All rights reserved COPYRIGHT PROTECTED DOCUMENT ISO 2015 All rights reserved. Unless otherwise
7、 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 ISO at the address below
8、 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 6953-2:2015ISO 6953-2:2015(E)Foreword v Introduction vi 1 Scope . 1 2 Norma
9、tive references 1 3 Terms and definitions . 2 4 Symbols and terms . 2 4.1 Symbols and units 2 4.2 Graphical symbols 2 5 Test conditions . 2 5.1 Gas supply . 2 5.2 Temperature 2 5.3 Pressures 2 5.4 Inlet pressure . 2 5.5 Test pressures (regulated pressure) 3 6 Test procedure to verify rated pressure
10、3 7 Flow characteristics tests 4 7.1 Test installation 4 7.2 General requirements . 5 7.3 Test procedures 5 7.3.1 Initial test procedure 5 7.3.2 Forward flow rate pressure characteristics test . 5 7.3.3 Relief flow rate pressure characteristics test . 6 7.3.4 Procedure for other regulated pressure v
11、alues 6 7.4 Calculation of characteristics . 6 7.4.1 Characteristic curves 6 7.4.2 Flow rate pressure hysteresis . 7 7.4.3 Maximum forward sonic conductance 7 7.4.4 Maximum relief sonic conductance . 8 8 Pressure regulation test . 9 8.1 Test circuit . 9 8.2 Test procedure . 9 9 Maximum air consumpti
12、on at null forward flow rate or relief flow rate for pilot- operated regulator with air bleed 9 9.1 Test installation 9 9.2 Test procedures .10 9.3 Calculation of characteristics 10 10 Special test procedures .10 10.1 Pilot pressure/regulated pressure characteristics test in the case of external pil
13、ot- ISO 2015 All rights reserved iii Contents PageBS ISO 6953-2:2015ISO 6953-2:2015(E)operated pressure regulators 10 10.1.1 Test installation 10 10.1.2 Test procedures11 10.1.3 Calculation of characteristics .11 10.2 Optional resolution test for pilot-operated regulator with air bleed 13 10.2.1 Gen
14、eral.13 10.2.2 Test installation 13 10.2.3 Test procedures13 10.2.4 Calculation of characteristics .14 10.3 Optional repeatability test .15 10.3.1 General.15 10.3.2 Test installation 15 10.3.3 General test method .16 10.3.4 Calculation of the repeatability value .16 11 Presentation of data .16 11.1
15、Flow-pressure characteristics 16 11.2 Pressure regulation characteristics .16 11.3 Maximum air consumption for pilot operated regulators with air bleed .16 11.4 Additional characteristics for pilot operated pressure regulators 17 11.5 Optional data .17 Annex A (informative) Comparison of repeatabili
16、ty test methods 18 Bibliography .35 iv ISO 2015 All rights reservedBS ISO 6953-2:2015ISO 6953-2:2015(E) Foreword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is norma
17、lly 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 liaison with ISO, also take part in th
18、e work. ISO collaborates closely with the International 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
19、 different approval criteria needed for the different types 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 docum
20、ent may be the subject of patent rights. ISO shall not be 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
21、/patents). Any trade name used in this document is information 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 p
22、rinciples in the Technical Barriers to Trade (TBT), see the following URL: Foreword Supplementary information. The committee responsible for this document is ISO/TC 131, Fluid power systems, Subcommittee SC 4, Connectors and similar products and components. This second edition cancels and replaces t
23、he first edition (ISO 6953-2:2000), which has been technically revised. 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 include in suppliers literature and product-markin
24、g requirements Part 2: Test methods to determine the main characteristics to be included in literature from suppliers Part 3: Alternative test methods for measuring the flow-rate characteristics of pressure regulators ISO 2015 All rights reserved vBS ISO 6953-2:2015ISO 6953-2:2015(E) Introduction In
25、 pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. When pressure reduction or pressure regulation is required, regulators and filter-regulators are components designed to maintain the pressure of the gas at an approximately constant lev
26、el. It is therefore necessary to know the performance characteristics of these components in order to determine their suitability in an application.vi ISO 2015 All rights reservedBS ISO 6953-2:2015Pneumatic fluid power Compressed air pressure regulators and filter-regulators Part 2: Test methods to
27、determine the main characteristics to be included in literature from suppliers 1 Scope This part of ISO 6953 specifies test procedures and a method of presenting the results concerning the parameters which define the main characteristics to be included in literature from suppliers of regulators and
28、filter-regulators conforming to ISO 6953-1. The purpose of this part of ISO 6953 is the following: to facilitate the comparison of pressure regulators and filter-regulators by standardizing test methods and presentation of test data; to assist in the proper application of pressure regulators and fil
29、ter-regulators in compressed air systems. The tests specified are intended to allow comparison among the different type of regulators and filter- regulators; they are not production tests to be carried out on each pressure regulator or filter-regulator manufactured. NOTE 1 The tests related to elect
30、ro-pneumatic pressure control valves are specified in ISO 100942. NOTE 2 Use ISO 6953-3 for an alternative dynamic test method for flow-rate characteristics using an isothermal tank instead of a flow meter. However, this method measures only the decreasing flow rate part of the hysteresis curve of f
31、orward flow and relief flow characteristics. 2 Normative references The following documents, in whole or in part, are referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referen
32、ced 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 applications ISO 3448, Industrial liquid lubricants ISO viscosity classification ISO 5598, Fluid p
33、ower systems and components Vocabulary ISO 6358-1, Pneumatic fluid power Determination of flow-rate characteristics of components using compressible fluids Part 1: General rules and test methods for steady-state flow ISO 6953-1:2015, Pneumatic fluid power Compressed air pressure regulators and filte
34、r-regulators Part 1: Main characteristics to be included in literature from suppliers and product-marking requirements ISO 10094-1, Pneumatic fluid power Electro-pneumatic pressure control valves Part 1: Main characteristics to include in the suppliers literature ISO 10094-2, Pneumatic fluid power E
35、lectro-pneumatic pressure control valves Part 2: Test methods to determine main characteristics to include in the suppliers literature INTERNATIONAL ST ANDARD ISO 6953-2:2015(E) ISO 2015 All rights reserved 1BS ISO 6953-2:2015ISO 6953-2:2015(E) 3 Terms and definitions For the purposes of this docume
36、nt, the terms and definitions given in ISO 6953-1, ISO 6358-1, ISO 10094-1, and ISO 5598 apply; in the order shown. 4 Symbols and terms 4.1 Symbols and units The symbols and units shall be in accordance with ISO 10094-2. See Table 1. Table 1 Symbols and units Description Symbol SI unit Practical uni
37、t Reference atmosphere p atm Pa kPa (bar) Inlet pressure p 1 Pa kPa (bar) Regulated pressure p 2 Pa kPa (bar) Forward volumetric flow rate at standard reference atmosphere q vf m 3 /s (ANR) dm 3 /min (ANR) Relief volumetric flow rate at standard reference atmosphere q vr m 3 /s (ANR) dm 3 /min (ANR)
38、 Reference temperature T 0 K or C a C Inlet temperature T 1 K or C a C Temperature at the regulated port T 2 K or C a C aemperature in K is used for calculations; temperature in C is used for test conditions. NOTE 1 bar = 100 kPa = 0,1 MPa = 10 5Pa = 10 5N/m 2 . 4.2 Graphical symbols The graphical s
39、ymbols used in this part of ISO 6953 are in accordance with ISO 1219-1. 5 Test conditions 5.1 Gas supply Unless otherwise specified, testing shall be conducted with compressed air. If another gas is used, it shall be noted in the test report. 5.2 Temperature The ambient fluid and the component under
40、 test shall be maintained at 23 C 10 C during all the tests. 5.3 Pressures The specified pressures shall be maintained within 2 %. 5.4 Inlet pressure The inlet pressure used for testing shall be the lower of the following pressures: the maximum regulated pressure, p 2,max , plus 200 kPa (2 bar); the
41、 specified maximum inlet pressure, p 1 , max .2 ISO 2015 All rights reservedBS ISO 6953-2:2015ISO 6953-2:2015(E) 5.5 Test pressures (regulated pressure) The preferential test pressures are chosen as approximately equal to 25 %, 40 %, 63 %, and 80 % of the upper limit of recommended adjustable pressu
42、re range. 6 Test procedure to verify rated pressure 6.1 Perform this test on three random samples if a single-rated pressure is proposed for the entire product or on six random samples if separate ratings are proposed for the inlet and outlet sections. If the product uses a diaphragm, modify or repl
43、ace it to withstand the pressure applied (diaphragms are excluded from the test criteria, but not the diaphragm support plates or any piston). Other product sealing means can be modified to prevent leakage and allow structural failure to occur during the test, but modifications shall not increase th
44、e structural strength of the pressure-containing envelope. For relieving regulators, the relieving system shall be blocked. 6.2 Prepare the test samples as follows: If a single pressure rating is proposed for the entire product, remove the control spring and replace it with a solid spacer whose leng
45、th maintains the poppet in its approximately half-open position. Close the gauge ports and the inlet port with plugs, and perform all testing by applying pressure to the outlet port. For relieving regulators, the relieving system shall be blocked. If a separate pressure rating is proposed for the in
46、let and outlet sections of the regulator, relieve the control spring force on three of the samples. Using a proposed pressure rating for the inlet, perform testing on the inlet port, allowing the poppet to be closed and keeping the outlet port open. Prepare the other three samples as described in pr
47、evious indent and test them using a proposed pressure rating for the outlet port. 6.3 The test should be done with a liquid which does not exceed ISO VG 32 (according to ISO 3448) or with compressed air . Maintain the temperature given in 5.2. When using a compressible medium, exercise safety precau
48、tions to contain an explosive failure. 6.4 After stabilizing the temperature, slowly pressurize to a level of one-half its proposed rated pressure. Hold at this level for 2 min and observe for leakage or failure, as defined in 6.5. 6.4.1 For products constructed of light alloys, brass, and steel, co
49、ntinue raising the pressure as above until a level of four times the proposed rated pressure has been reached. 6.4.2 For products constructed of zinc, die cast alloys, or plastics with design operating temperatures of up to 50 C, continue raising the pressure as above until a level of four times the proposed rated pressure has been reached. with design operating temperature between 50 C to 80 C, continue raising the pressure as above until a level of five ti
