ISO/DIS 10631:2020 Industrial Valves - Metallic butterfly valves – Draft International Standard for Public Comment



What is it?: This document specifies the general requirements for design, materials (e.g. steel, cast iron, ductile iron, copper alloy), pressure/temperature ratings and testing for butterfly valves having metallic bodies for use in flanged or butt welding piping systems. This document applies to metallic butterfly valves used for all industrial applications. Additional requirements given in the relevant application standards may apply to butterfly valves used for more specific applications (e.g. for the water industry, the chemical and petrochemical process industry, the oil and gas industry).
This document covers butterfly valves of the following nominal sizes, DN 40; 50; 65; 80; 100; 125; 150; 200; 250; 300; 350; 400; 450; 500 (550); 600 (650); 700; 750; 800; 900; 1 000; 1 050; 1 200; 1 400; 1 500; 1 600; 1 800; 2 000; 2 200; 2 400:
This International Standard is applicable to butterfly valves of the following pressure designations, PN and Class:
— PN 2,5; PN 6; PN 10; PN 16; PN 25; PN 40; PN 63; PN 100;
— Class 25, 125; 150; 250; 300; 600

Why is it important?: The main changes compared to the previous edition are as follows:
— the extension of the pressure ratings to include PN 63, PN 100, and Class 25, 250 and 600;
— update of the normative references and the terms and definitions;
— addition in Clause 4 of a requirement to mark the valve with any reduced pressure and/or temperature limits;
— face-to-face dimensions and dimension tolerance were moved in 5.3;
— addition of a 5.6 for disc requirements;
— addition in 5.7 of a requirement to have a feature preventing shaft ejection from the valve in the shaft or shaft-to-disc connection fails;
— clarification of 5.8.2.3 regarding the way to secure adjustable stops;
— addition of specified minimum clearance between fully open disc and matching pipe in a new 5.10.6.

Supersedes: Will potentially update the 2013 standard.

Published in Valve User Magazine Issue 53


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