1、raising standards worldwideNO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAWBSI Standards PublicationBS ISO 10770-2:2012Hydraulic fluid power Electrically modulatedhydraulic control valvesPart 2: Test methods for three-portdirectional flow-control valvesBS ISO 10770-2:2012 BRITI
2、SH STANDARDNational forewordThis British Standard is the UK implementation of ISO 10770-2:2012.It supersedes BS ISO 10770-2:1998 which is withdrawn.The UK participation in its preparation was entrusted to TechnicalCommittee MCE/18/-/8, Product testing.A list of organizations represented on this comm
3、ittee can beobtained 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 2012. Published by BSI StandardsLimited 2012ISBN 978 0 580 74182 1ICS 23.100.50
4、Compliance with a British Standard cannot confer immunity fromlegal obligations.This British Standard was published under the authority of theStandards Policy and Strategy Committee on 31 December 2012.Amendments issued since publicationDate Text affectedBS ISO 10770-2:2012 ISO 2012Hydraulic fluid p
5、ower Electrically modulated hydraulic control valves Part 2: Test methods for three-port directional flow-control valvesTransmissions hydrauliques Distributeurs hydrauliques modulation lectrique Partie 2: Mthodes dessai pour distributeurs de commande de dbit trois voiesINTERNATIONAL STANDARDISO10770
6、-2Second edition2012-12-01Reference numberISO 10770-2:2012(E)BS ISO 10770-2:2012ISO 10770-2:2012(E)ii ISO 2012 All rights reservedCOPYRIGHT PROTECTED DOCUMENT ISO 2012All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any mean
7、s, 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 20Tel. + 41 22 749 01 11Fax + 41 22 749 09 47E-mail copyrightis
8、o.orgWeb www.iso.orgPublished in SwitzerlandBS ISO 10770-2:2012ISO 10770-2:2012(E) ISO 2012 All rights reserved iiiContents PageForeword ivIntroduction v1 Scope 12 Normative references . 13 Terms, definitions, symbols and units 13.1 Terms and definitions . 13.2 Symbols and units 24 Standard test con
9、ditions . 35 Test installation 36 Accuracy 56.1 Instrument accuracy . 56.2 Dynamic range . 57 Electrical tests for valves without integrated electronics 57.1 General . 57.2 Coil resistance . 57.3 Coil inductance - Optional test 57.4 Insulation resistance 78 Performance tests . 78.1 Steady-state test
10、s 78.2 Dynamic tests .219 Pressure impulse test 2810 Presentation of results .2810.1 General .2810.2 Test reports .2911 Identification statement (reference to this part of ISO 10770) 30Annex A (informative) Testing guidance .31BS ISO 10770-2:2012ISO 10770-2:2012(E)ForewordISO (the International Orga
11、nization 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 member body interested in a subject for which a technical committee has been establis
12、hed 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 Electrotechnical Commission (IEC) on all matters of electrotechnical standardization
13、.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 International Standards adopted by the technical committees are circulated to the member bodies for voting. Pub
14、lication 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 subject of patent rights. ISO shall not be held responsible for identifying any or all such patent
15、rights.ISO 10770-2 was prepared by Technical Committee ISO/TC 131, Fluid power systems, Subcommittee SC 8, Product testing.This second edition cancels and replaces the first edition (ISO 10770-2:1998) which has been technically revised.ISO 10770 consists of the following parts, under the general tit
16、le Hydraulic fluid power Electrically modulated hydraulic control valves: Part 1: Test methods for four-port directional flow-control valves Part 2: Test methods for three-port directional flow-control valves Part 3: Test methods for pressure control valvesiv ISO 2012 All rights reservedBS ISO 10770
17、-2:2012ISO 10770-2:2012(E)IntroductionThis part of ISO 10770 has been prepared with the intention of improving the uniformity of valve testing and hence the consistency of recorded valve performance data so that this data can be used for system design, regardless of the data source. ISO 2012 All rig
18、hts reserved vBS ISO 10770-2:2012BS ISO 10770-2:2012Hydraulic fluid power Electrically modulated hydraulic control valves Part 2: Test methods for three-port directional flow-control valves1 ScopeThis part of ISO 10770 describes methods for determining the performance characteristics of electrically
19、 modulated hydraulic three-port directional flow-control valves.This type of electrohydraulic valve controls the direction and amount of hydraulic flow in a hydraulic system.2 Normative referencesThe following referenced documents are indispensable for the application of this document. For dated ref
20、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 Graphical symbols and circuit diagrams Part 1: Graphical symbols for conventional use and data-processing a
21、pplicationsISO 3448, Industrial liquid lubricants ISO viscosity classificationISO 4406, Hydraulic fluid power Fluids Method for coding the level of contamination by solid particlesISO 5598, Fluid power systems and components VocabularyISO 6743-4, Lubricants, industrial oils and related products (cla
22、ss L) Classification Part 4: Family H (Hydraulic systems)ISO 9110-1:1990, Hydraulic fluid power Measurement techniques Part 1: General measurement principlesISO 10771-1, Hydraulic fluid power Fatigue pressure testing of metal pressure-containing envelopes Part 1: Test methodIEC 60617-DB-12M, Graphic
23、al symbols for diagrams3 Terms, definitions, symbols and units3.1 Terms and definitionsFor the purposes of this document, the terms and definitions given in ISO 5598 and the following apply.3.1.1electrically modulated hydraulic directional flow control valvevalve that provides a degree of proportion
24、al flow control in response to a continuously variable electrical input signalNOTE The flow direction can be changed by the input signal.3.1.2input signal deadbandportion of input signal that does not produce a controlled flowINTERNATIONAL STANDARD ISO 10770-2:2012(E) ISO 2012 All rights reserved 1B
25、S ISO 10770-2:2012ISO 10770-2:2012(E)3.1.3thresholdchange of input signal required to produce a reversal in continuous control valve outputNOTE The threshold is expressed as a percentage of rated input signal.3.1.4rated input signalsignal defined by the manufacturer to achieve rated output3.2 Symbol
26、s and unitsFor the purposes of this document, the symbols given in Table 1 apply.The graphical symbols in this document conform to ISO 1219-1 and IEC 60617-DB-12M.Table 1 Symbols and unitsParameter Symbol UnitInductance LcHInsulation resistance RiInsulation test current IiAInsulation test voltage Ui
27、VResistance RcDither amplitude % (of max. input signal)Dither frequency HzInput signal I, orUA, orVRated input signal InorUnA, orVOutput flow q l/minRated flow qnl/minFlow gain Kv= (Dq/DI) or Kv= (Dq/DU)l/min/A l/min/VHysteresis % (of max. output signal)Internal leakage qll/minSupply pressure pPMPa
28、(bar)Return pressure pTMPa (bar)Load pressure pAMPa (bar)Valve pressure drop pv= pP- pAor pv= pA- pTMPa (bar)Rated valve pressure drop pNMPa (bar)Pressure gain Kp= (DpL/DI) or Kp= (DpL/DU)MPa (bar)/A MPa (bar)/VThreshold % (of max. input signal)Amplitude (ratio) dBPhase lag Temperature CFrequency f
29、HzTime t s2 ISO 2012 All rights reservedBS ISO 10770-2:2012ISO 10770-2:2012(E)Parameter Symbol UnitTime constant tcsLinearity error Qerrl/min4 Standard test conditionsUnless otherwise specified, tests shall be carried out using the standard test conditions given in Table 2.Table 2 Standard test cond
30、itionsParameter ConditionAmbient temperature 20C 5CFluid cleanliness Solid contaminant code number shall be stated in accordance with ISO 4406Fluid type Commercially available mineral based hydraulic fluid, (i.e. L-HL in accordance with ISO 6743-4 or other fluid with which the valve is able to opera
31、te)Fluid viscosity (32 8) cSt at valve inletViscosity grade Grade VG 32 or VG 46 in accordance with ISO 3448Pressure drop Test requirement 2,0 %Return pressure Shall conform to the manufacturers recommendations5 Test installationA test installation conforming to the requirements of either Figure 1,
32、10 or 11 shall be used for testing all valves.SAFETY PRECAUTIONS It is essential that consideration is given to the safety of personnel and equipment during the tests.Figures 1, 10 and 11 show the minimum items required to carry out the tests without any safety devices to protect against damage in t
33、he event of component failure. For tests using the circuits shown in Figures 1, 10 and 11, the following apply.a) Guidance on carrying out the tests is given in Annex A.b) A separate circuit may be constructed for each type of test. This can improve the accuracy of test results as it eliminates the
34、possibility of leakage through the shut off valves.c) Hydraulic performance tests are carried out on a combination of valve and amplifier. Input signals are applied to the amplifier and not directly to the valve. For electrical tests the signals are applied directly to the valve.d) If possible, hydr
35、aulic tests should be conducted using an amplifier recommended by the valve manufacturer. If not, the type of amplifier used should be recorded, with the operating details (i.e. pulse width modulation frequency, dither frequency and amplitude).e) The amplifier supply voltage, and magnitude and sign
36、of the voltage applied to the valve during the on and off periods of the pulse width modulation, should be recorded.f) Electronic test equipment and transducers should have a bandwidth or natural frequency at least 10 times greater than the maximum test frequency.g) Pressure transducers 6 to 8 in Fi
37、gures 1 and 10 may be replaced by a differential pressure transducer for each flow path under test.Table 1 (continued) ISO 2012 All rights reserved 3BS ISO 10770-2:2012ISO 10770-2:2012(E)S7YPTS32121013114515113678EEE94S4S5S6S2S1AXKey1 main flow source 13 temperature indicator2 main relief valve 14 p
38、ressure gauge3 external pilot flow source 15 signal conditioner4 external pilot relief valve S1 to S7 shut off valves5 unit under test A working port6 to 8 pressure transducers P supply port9 data acquisition T return port10, 11 flow transducer X pilot supply port12 signal generator Y pilot drain po
39、rtFigure 1 Test circuit4 ISO 2012 All rights reservedBS ISO 10770-2:2012ISO 10770-2:2012(E)6 Accuracy6.1 Instrument accuracyInstrumentation shall be accurate to within the limits shown in Class B of ISO 9110-1:1990:a) electrical resistance: 2 % of the actual measurement;b) pressure: 1 % of the valve
40、s rated pressure drop to achieve rated flow;c) temperature: 2 % of the ambient temperature;d) flow: 2,5 % of the valves rated flow;e) input signal: 1,5 % of the electrical input signal required to achieve the rated flow.6.2 Dynamic rangeFor the dynamic tests, ensure that the measuring equipment, amp
41、lifiers and recording devices do not generate any damping, attenuation or phase shift of the output signal being recorded that would affect the measured value by more than 1 % of the measured value.7 Electrical tests for valves without integrated electronics7.1 GeneralAs appropriate, perform the tes
42、ts described in 7.2 to 7.4 on all valves without integrated electronics before proceeding to subsequent tests.NOTE Tests 7.2 to 7.4 only apply to current-driven valves.7.2 Coil resistance7.2.1 Coil resistance (cold)Carry out the test as follows.a) Soak the complete un-energized valve at the specifie
43、d ambient temperature for at least 2 h.b) Measure and record the electrical resistance between the two leads or terminals of each coil in the valve.7.2.2 Coil resistance (hot)Carry out the test as follows.a) Soak the complete energized valve, mounted on a subplate recommended by the manufacturer, at
44、 its maximum rated temperature and operate the complete valve, fully energized and without flow, until the coil temperature stabilizes.b) Measure and record the electrical resistance between the two leads or terminals of each coil in the valve. The resistance value shall be measured within 1 s of re
45、moving the supply voltage.7.3 Coil inductance - Optional testThis test method shall not be taken to determine a definitive value of Inductance. The value obtained shall be used for comparison purposes only. ISO 2012 All rights reserved 5BS ISO 10770-2:2012ISO 10770-2:2012(E)Carry out the test as fol
46、lows.a) Connect the coil to a constant voltage supply capable of delivering at least the rated current of the coil.b) The armature shall be held stationary at 50 % of its working stroke during the test.c) Monitor the coil current on an oscilloscope or similar equipment.d) Adjust the voltage so that
47、the steady-state current equals the rated current of the coil.e) Switch the voltage off then on and record the current transient behaviour.f) Determine the time constant tcof the coil (see Figure 2) and calculate the inductance Lcusing Formula 1.LRtccc= (1)whereRcis the coil resistance in ohms.12 3X
48、100%63 %YKey1 d.c. current trace2 initiation3 time constant (tc)X timeY currentFigure 2 Coil inductance measurement6 ISO 2012 All rights reservedBS ISO 10770-2:2012ISO 10770-2:2012(E)7.4 Insulation resistanceEstablish the insulation resistance of the coil as follows.a) If internal electrical compone
49、nts are in contact with the fluid (i.e. the coil is wet), fill the valve with hydraulic fluid before carrying out the test.b) Connect the valve coil terminals together and apply voltage Uiof 500 V d.c. between them and the valve body for 15 s.c) Using a suitable insulation tester, record the insulation resistance Ri.d) For testers with a current (ampere, A) readout, calculate the insulation resistance using Formula (2).RUIiii= (2)8 Performance testsAll per
