ISO 6403 INTERNATIONAL STANDARD First edition 1988-11-01 Corrected and reprinted 1989-05-01 INTERNATIONAL ORGANIZATION FOR STANDARDIZATION ORGANISATION INTERNATIONALE DE NORMALISATION MEKAYHAPOAHAR OPFAHM3ALMR O CTAHAAPTИ3ALMM Hydraulic fluid power -- Valves controlling flow and pressure -- Test methods Transmissions hydrauliques -- Regulateurs de debit et de pression -- Methodes d'essai Reference number ISO 6403 : 1988 (E) S( Not for Resale ISO 6403 : 1988 (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 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, govern- mental 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. Draft International Standards adopted by the technical committees are circulated to the member bodies for approval before their acceptance as International Standards by the Iso Council. They are approved in accordance with ISO procedures requiring at least 75 % approval by the member bodies voting. International Standard ISO 6403 was prepared by Technical Committee ISO/TC 131, Fluid power systems. Users should note that all International Standards undergo revision from time to time and that any reference made herein to any other International Standard implies its latest edition, unless otherwise stated. @ International Organization for Standardization, 1988 Printed in Switzerland ii vorking permitted without license from IHS Not for Resale ISO 6403 : 1988 (E) Contents Page 0 Introduction 1 Scope and field of application 2 References. 3Definitions 4 Symbols and units 5 Test installation -- General requirements . . 5.1 Test circuit . 5.2 Pressure- and temperature-sensing points . . 5.3 Filtration and contimination level. . . 6 General test conditions. . 6.1 Test fluid . . 6.2 Test temperatures . 6.3 Steady-state conditions 6.4 Proof pressure . 7 Test procedure for directional control valves. 7.1 Test circuit .. 7.2 Steady-state pressure differential/flow characteristics 7.3 Internal feakage .. 7.4 Switching envelope. 7.5 Transient characteristics 8 Test procedure for non-return (check) valves . 8.1 Test circuits . 8.2 Pressure differential/flow characteristics . 8.3Pilot pressure , 9 Test procedure for valves controlling pressure 9.1 Test circuits 9.2 Controi setting . 9.3 Pressure-relief valves . 9.4 Pressure-reducing valves 9.5 Unloading valves . ii Copyright International Organization for Standardization tted without license from IHS Not for Resale