ISO INTERNATIONAL STANDARD 7440-1 Second edition 1991-12-01 Road vehicles --Fuel injection equipment testing Part 1: Calibrating nozzle and holder assemblies Vehicules routiers -Essai des equipements d'injection de combustible Partie1:Ensemblesporte-injecteur etinjecteurde calibration Referencenumbel ISO 7440-1:1991(E) ISO7440-1:1991(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 normally carried out through IsoO technical committees.Each member body interested in a subject for "hich a technical committee has been established has the right to be epresented on that committee. International organizations, govern- ental and non-governmental, in liaisonwithiso,alsotakepart in the rork.Iso collaborates ciosely withthe International Electrotechnical commission (IEC) on all matters of electrotechnical standardization. iraft International Standards adopted by thetechnical committees are irculated to the member bodies for voting.Publication as an Inter- ational Standard requires approval by at least75%of the member odiescastingavote. iternational StandardIso7440-1waspreparedbyTechnicalCommittee 3o/TC22,Roadvehicles,Sub-CommitteeSC7,Injectionequipmentand Itersforuseonroadvehicles. hissecond edition cancels and replaces thefirst edition (Iso 440-1:1985),of which3.2.3and figures 5and 6havebeentechnically evised; clause5andtable1 (1985edition)havebeendeleted. 3o 7440 consists of the following parts,under the general title Road ehicles--Fuelinjectionequipmenttesting: -Part1:Calibratingnozzleandholderassemblies Part2:Orificeplateflow-measurement ietting and maintenancerequirements forfuel injection equipment are pecifiedinIsO4008-3:1987,Roadvehicles-Fuelinjectionpumptesting -Part3:Applicationandtestprocedures. innexAofthispartofIso7440isforinformationonly. ISO 1991 r by any means,electronic or mechanical, including photocopying and microfilm,without ermission in writing from the publisher. International Organizationfor Standardization CasePostale56·CH-1211Geneve20·Switzerland rinted in Switzerland ISO7440-1:1991(E) Introduction The calibrating nozzle and holder assemblies are intendedto simulate closely the function of the nozzle and holder assemblies in the fuel in- jection system of a compression-ignition (diesel)engine.They are flow gauges and require careful handling and maintenance. The manufacturer of the injection equipment and/or the manufacturer of the engine will need to specify the type of calibrating nozzle and holderassembly,the appropriate single hole orifice plate size or pintle nozzle(as applicable),highpressurepipes,exact limits,etc.tobeused. 川i