1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 10041-2:2010Pneumatic fluid power Electro-pneumatic continuousflow control valvesPart 2: Test methods to determine maincharacteristics to include in the suppliersliteratur
2、eBS ISO 10041-2:2010 BRITISH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10041-2:2010.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/5, Control components.A list of organizations represented on this committee can beobtained on
3、request to its secretary.This publication does not purport to include all the necessaryprovisions of a contract. Users are responsible for its correctapplication. BSI 2010ISBN 978 0 580 66298 0ICS 23.100.50Compliance with a British Standard cannot confer immunity fromlegal obligations.This British S
4、tandard was published under the authority of theStandards Policy and Strategy Committee on 30 November 2010.Amendments issued since publicationDate Text affectedBS ISO 10041-2:2010Reference numberISO 10041-2:2010(E)ISO 2010INTERNATIONAL STANDARD ISO10041-2First edition2010-10-15Pneumatic fluid power
5、 Electro-pneumatic continuous flow control valves Part 2: Test methods to determine main characteristics to include in the suppliers literature Transmissions pneumatiques Distributeurs lectropneumatiques commande continue de dbit Partie 2: Mthodes dessai pour dterminer les principales caractristique
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11、nd ii ISO 2010 All rights reservedBS ISO 10041-2:2010ISO 10041-2:2010(E) ISO 2010 All rights reserved iiiContents Page Foreword iv Introduction.v 1 Scope1 2 Normative references1 3 Terms and definitions .2 4 Symbols and units.2 5 Test conditions 3 5.1 Gas supply .3 5.2 Temperature.3 5.3 Pressures .3
12、 5.4 Electrical supply 3 6 Test procedure.3 6.1 Test conditions 3 6.2 Inlet pressure .3 6.3 Static tests .3 7 Tests to determine control signal-flow rate characteristics .4 7.1 Test circuits .4 7.2 Test procedures.7 7.3 Calculation of characteristics 12 8 Test to determine flow rate characteristics
13、14 8.1 Test circuit .14 8.2 Test procedures.14 8.3 Calculation of global characteristics.15 9 Test to determine pressure gain characteristics .16 9.1 General .16 9.2 Test circuit .16 9.3 Test procedure.17 9.4 Characteristic curve of pressure gain at null operating flow rate17 10 Test to determine le
14、akage at null operating flow rate characteristics.18 10.1 Test circuit .18 10.2 Test procedure.18 10.3 Calculation of characteristic 18 11 Test to determine dynamic characteristics 19 11.1 Test installation .19 11.2 Test to determine frequency response .19 11.3 Test to determine step responses .20 1
15、2 Presentation of test results 22 12.1 General .22 12.2 Control signal-flow rate characteristics22 12.3 Global flow rate characteristics .23 12.4 Pressure gain characteristics at null operating flow rate .23 12.5 Leakage characteristic at null operating flow rate.23 12.6 Dynamic characteristics .23
16、13 Identification statement (reference to this part of ISO 10041) .24 Bibliography25 BS ISO 10041-2:2010ISO 10041-2:2010(E) iv ISO 2010 All rights reservedForeword ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The
17、 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 right to be represented on that committee. International organizations, governmental and non-gove
18、rnmental, 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. International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2. T
19、he 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 an International Standard requires approval by at least 75 % of the member bodies casting a vot
20、e. 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. ISO 10041-2 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 5
21、, Control products and components. ISO 10041 consists of the following parts, under the general title Pneumatic fluid power Electro-pneumatic continuous flow control valves: Part 1: Main characteristics to include in the suppliers literature Part 2: Test methods to determine main characteristics to
22、include in the suppliers literature BS ISO 10041-2:2010ISO 10041-2:2010(E) ISO 2010 All rights reserved vIntroduction In pneumatic fluid power systems, power is transmitted and controlled through a gas under pressure within a circuit. Electro-pneumatic continuous flow control valves continuously mod
23、ulate the pneumatic power of a system in response to a continuous electrical control signal and link the electrical control quantity to the effective section of each variable port of the output stage (flow rate stage). The mass flow rate that crosses each restriction depends on the downstream and up
24、stream pressures and the type of gas. When control of position or force, including position- or force-tracking of a pneumatic cylinder, is required, electro-pneumatic continuous flow control valves can be used to precisely modulate the mass flow rates entering or exiting each cylinder chamber, resul
25、ting in a precise positioning. It is therefore necessary to know some performance characteristics of these electro-pneumatic continuous flow control valves in order to determine their suitability for a particular application. BS ISO 10041-2:2010BS ISO 10041-2:2010INTERNATIONAL STANDARD ISO 10041-2:2
26、010(E) ISO 2010 All rights reserved 1Pneumatic fluid power Electro-pneumatic continuous flow control valves Part 2: Test methods to determine main characteristics to include in the suppliers literature 1 Scope This part of ISO 10041 specifies the test procedures and a method of presenting the result
27、s concerning the parameters that define the main characteristics to be included in the suppliers literature of electro-pneumatic continuous flow control valves, in accordance with ISO 10041-1. This part of ISO 10041 is intended to facilitate the comparison of these types of valves by standardizing t
28、est methods and the presentation of test results, and assist in the proper application of these valves in pneumatic systems. The specified tests are not production tests to be carried out on each valve manufactured. NOTE 1 Tests related to electro-pneumatic continuous pressure control valves are spe
29、cified in ISO 10094-2. NOTE 2 Tests described in this part of ISO 10041 are performed on valves with exhaust port(s) connected to the atmosphere except for two-port valves. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated ref
30、erences, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. ISO 1219-1, Fluid power systems and components Graphic symbols and circuit diagrams Part 1: Graphic symbols for conventional use and data-processing appl
31、ications ISO 5598, Fluid power system and components Vocabulary ISO 6358-11), Pneumatic fluid power Determination of flow-rate characteristics of components Part 1: General rules and test methods for steady-state flow ISO 10041-1:2010, Pneumatic fluid power Electro-pneumatic continuous flow control
32、valves Part 1: Main characteristics to include in the suppliers literature 1) To be published. BS ISO 10041-2:2010ISO 10041-2:2010(E) 2 ISO 2010 All rights reserved3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO 5598 and ISO 10041-1 apply. 4 Symbols
33、and units For the purposes of this document, the symbols and units listed in Table 1 apply. Table 1 Symbols and units Description Symbol SI Unit Critical back-pressure ratioab Sonic conductance Cm3/(sPa) (ANR)cSubsonic index m Atmospheric pressure patmPa Reference pressurecp0Pa Inlet port stagnation
34、 gauge pressurebp1Pa Working port stagnation gauge pressurebp2, p4Pa Air exhaust port stagnation gauge pressurebp3, p5PaCracking pressure pcPa Hysteresis H % Maximum hysteresis difference p2,h,maxPa Linearity L % Maximum linearity difference p2,l,maxPa Volume flow rate at standard reference atmosphe
35、re qVm3/s (ANR)cVolume flow rate related to the relief flow rate qV,rm3/s (ANR)cMaximum volume flow rate related to the forward flow rate qV,f,max3/s (ANR)aRepeatability r % Reference temperature T0K Inlet port temperatureaT1Working port temperatureaT2K Electrical control signal w (wstart, wstop) V,
36、 mA or digital signal Resolution S % aDefined in ISO 6358-1. bSee ISO 117274. cReference atmosphere is defined in ISO 87782, i.e.: T0= 293,15 K, p0= 100 kPa (1 bar) and relative humidity of 65 %. The graphic symbols used in Figures 1 to 4 and in Figures 6 to 8 are in accordance with ISO 1219-1. BS I
37、SO 10041-2:2010ISO 10041-2:2010(E) ISO 2010 All rights reserved 35 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 control valve tempera
38、tures shall be maintained at 23 C 10 C during all the tests. 5.3 Pressures 5.3.1 General The specified pressures shall be maintained within 2 %. 5.3.2 Inlet pressure If possible, testing should be conducted at an inlet pressure of 630 kPa (6,3 bar). If this is not possible, the inlet pressure shall
39、be selected from the values given in ISO 2944. 5.3.3 Verification It shall be periodically verified that no pressure bleed of measuring instruments is obstructed by solid or liquid particles. 5.4 Electrical supply The tests shall be carried out under nominal electrical conditions. 6 Test procedure 6
40、.1 Test conditions The valve under test shall be installed and operated in accordance with the manufacturers application instructions. 6.2 Inlet pressure During the static and dynamic tests specified in Clauses 7 to 11, the inlet pressure shall be maintained constant. During the dynamic tests specif
41、ied in Clause 11, a tank buffer as indicated in Figure 8 shall be used in order to reduce fluctuations in the inlet pressure. 6.3 Static tests During the static tests specified in Clauses 7 to 10, as soon as steady-state conditions are reached, every series of measurements obtained under related spe
42、cified test conditions shall be recorded. When these measurements are performed in a step-by-step manner, the test conditions shall be modified slowly to prevent instability. BS ISO 10041-2:2010ISO 10041-2:2010(E) 4 ISO 2010 All rights reservedNOTE Figures 1 to 4 and Figures 6 to 8 represent typical
43、 circuits that do not show the electrical supply circuit necessary to operate electrically modulated pneumatic valves and that do not contain all the necessary safety devices for protection against hazards that may be caused by the failure of a component or piping. It is important that those respons
44、ible for conducting the tests take into account the necessity to protect personnel and property. 7 Tests to determine control signal-flow rate characteristics 7.1 Test circuits 7.1.1 Test circuit with working port connected to the atmosphere 7.1.1.1 Figure 1 represents a typical test circuit for mea
45、suring the control signal-flow rate characteristics of a three-port valve when the working port is connected to atmosphere. This circuit diagram uses the test circuit specified in ISO 6358-1 for testing under steady-state conditions components that exhaust directly to atmosphere, with the following
46、additional requirements: the valve under test shall be located in the circuit so that the inlet port is connected to the upstream transition connector and pressure-measuring tube; the flowmeter shall be located downstream of the valve under test, at the working port and not at the inlet port, in ord
47、er to measure the actual operating flow rate, using downstream transition connector and pressure-measuring tube; items 11 and 12 are not required when using component under test for which the exhaust port cannot be connected. 7.1.1.2 The test circuit for five-port control valves is the same as the o
48、ne shown in Figure 1, with the working port that is not being evaluated connected to atmosphere. NOTE When possible, in the case of five-port valves, both working ports can be evaluated simultaneously when connected to the atmosphere using two flowmeters located downstream of the valve under test at
49、 both working ports. 7.1.1.3 The test circuit for two-port control valves is the same as the one shown in Figure 1, except that the component under test does not have any exhaust port. Key 1 supply pressure regulator 2 shut-off valve 3, 9, 12 pressure-measuring tubes 4 sensor to measure inlet temperature T15 pressure gauge or transducer to measure inlet pressure p16, 8, 11 transition connectors 7 valve under test 10 flowmeter to measure operating mass flow rate Figure 1
