BS EN ISO 16138: 2006+A1:2019 Industrial valves - Diaphragm valves of thermoplastics materials. Amended standard published

What is it?: This International Standard specifies requirements for the design, functional characteristics and manufacture of diaphragm valves made of thermoplastics materials intended for isolating and control service, their connection to the pipe system, the body materials and their pressure/temperature rating between − 40 °C and + 120 °C, for a lifetime of 25 years, and also specifies their tests.

Why is it important?: The main changes compared to the previous edition are as follows:

— the referenced standards have been updated;

— The valve body materials shall be selected from ISO 15493 or ISO 15494 or ISO 10931;

— For each valve body material, the design strength shall conform to ISO 9393-2;

— The seat and packing/shell leak tightness shall be verified on all complete valves through seat and packing tests carried out in accordance with the requirements of ISO 9393-2.

— The lever and hand-wheel rim forces to open and fully close the valve shall not exceed the values given for the operating manual force F in EN 12570.

— The body and bonnet/cover raw materials and the long-term behaviour of the complete valve shall be tested in accordance with ISO 1167-1.

Supersedes: This is an amended standard, which supersedes BS EN ISO 16138:2006, which is withdrawn.

Published in Valve User Magazine Issue 51

Winter 2019 // Issue 51
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