STEEL BALL VALVES FOR GENERAL PURPOSE INDUSTRIAL APPLICATIONS – UPDATED STANDARD ISSUED - BS ISO 7121:2016

What is it?
BS ISO 7121 specifies the requirements for a series of steel ball valves suitable for general-purpose industrial applications.

It covers valves of the nominal sizes

• DN 8, 10, 15, 20, 25, 32, 40, 50, 65, 80, 100, 150, 200, 250, 300, 350, 400, 450, 500, and 600 (NPS 1/4, 3/8, 1/2, 3/4, 1, 11/4, 11/2, 2, 21/2, 3, 4, 6, 8, 10, 12, 14, 16, 18, 20 and 24),

and is applicable to the following pressure designations:

• PN 10; 16; 25; 40; 63; 100;

• Class 150; 300; 600; 800; 900.

Why is it important?
This third edition has been technically revised with the following changes:

• In the scope DN 600, NPS 20 and 24, Class 800 and a note on the applicability of this Class were added;

• The normative references were updated;

• Definitions for DN, NPS, PN and Class were added;

• A line for DN 600 was added in Table 2;

• A line for DN 600 and a column for Class 800 were added in Table 3;

• A column for DN 600 was added in Table 4;

• A column for Class 800 was added in Table 6;

• In Tables 7 and 8, DN is up to 600;

• In 5.2.12.3, vertically split glands are not allowed anymore; Annex A was updated accordingly;

• 8.2.2 on site inspection was deleted; Annex A was updated accordingly.

Supersedes:
BS ISO 7121:2006 has been withdrawn

This standard is available from BSi Publications at a price of £182.00 (members price £91.00). Those people that are members of PSE/18 or PSE/18/3 committees are able to download the standard for free.

Published in Valve User Magazine Issue 38


Autumn 2017 // Issue 42
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