New Standard from Last Update.

NATIONAL FOREWORD

This Indian Standard which is identical with ISO 10434 : 2020 ‘Bolted bonnet steel gate valves for the petroleum, petrochemical and allied industries’ issued by the International Organization for Standardization (ISO) was adopted by the Bureau of Indian Standards on recommendation of the Chemical Engineering Plants and Related Equipments Sectional Committee and approval of the Mechanical Engineering Division Council.

This standard supersedes IS 10611 : 1983 ‘Steel gate valves (flanged and butt-welded ends) for petroleum, petrochemicals and allied industries.’

The text of ISO Standard has been approved as suitable for publication as an Indian Standard without deviations. Certain terminologies and conventions are, however, not identical to those used in Indian Standards. Attention is particularly drawn to the following:

a) Wherever the words ‘International Standard’ appears referring to this standard, they should beread as ‘Indian Standard’.

b) Comma (,) has been used as a decimal marker, while in Indian Standards, the current practiceis to use a point (.) as the decimal marker.