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This International Standard specifies methods for determining, under steady-state conditions, the pressure differential caused by the flow through any given path in a hydraulic fluid power valve. Requirements for test installations, procedures and presentation of results are specified. This International Standard may also be applied to other fluid power components where similar conditions apply. Accuracy of measurement is divided into three classes (A, B and C) which are explained in annex A. Guidance as to the use of practical units for the presentation of results is given in annex C. Annex D provides a pre-test checklist of those items where agreement is recommended between the parties concerned.