IS 10069 : 2023/ISO 4409 : 2019 Hydraulic Fluid Power - Positive-Displacement Pumps, Motors and Integral Transmissions - Methods of Testing and Presenting Basic Steady State Performance
NATIONAL FOREWORD
This Indian Standard (Third Revision) which is identical with ISO 4409 : 2019 ‘Hydraulic fluid power - Positive-displacement pumps, motors and integral transmissions - Methods of testing and presenting basic steady state performance’ issued by the International Organization for Standardization (ISO), was adopted by the Bureau of Indian Standards on recommendation of the Fluid Power Systems Sectional Committee and approval of the Production and General Engineering Division Council.
This Indian Standard was first published in 1982 and subsequently revised in 1992 and 2017. This revision been undertaken to align it with the latest version of ISO 4409.
The major changes in this revision are as follows:
a) The normative references in 2 have been updated and revised to reflect the changes made to this document;
b) The terms and definitions in 3 were updated and correctly referenced to agree with the existing ISO standards;
c) 4 now correctly references the appropriate standard for symbols and units and the corresponding table has been revised to display symbols and units correctly;
d) The general description of 5 was revised to include various types of conduits. A table with recommendations for the test fluid to be used is now provided, and the circuit diagrams have been revised for technical accuracy;
e) The suggested expression of results has been updated in 6 to include meaningful values obtained from the data gathered with the tests; and
f) The bibliography has been updated.
The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:
a) Wherever the words 'International Standard' appear referring to this standard, they should be read as 'Indian Standard'.
b) Comma (,) has been used as a decimal marker while in Indian Standards, the current practice is to use a point (.) as the decimal marker.