EN ISO 4126-3:2020

Safety devices for protection against excessive pressure - Part 3: Safety valves and bursting disc safety devices in combination (ISO 4126-3:2020)

Publication date:   Jan 21, 2021

General information

60.60 Standard published   Sep 30, 2020


CEN/TC 69 Industrial valves

European Norm

13.240   Protection against excessive pressure



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This document specifies only the requirements for a product assembled from the in-series combination of safety valves or CSPRS (controlled safety pressure relief systems) according to ISO 4126‑1, ISO 4126‑4 and ISO 4126‑5, and bursting disc safety devices, according to ISO 4126‑2, installed upstream of the valve within five pipe diameters of the valve inlet. It specifies the design, application and marking requirements for such products, composed of the bursting disc safety device, a safety valve or CSPRS and, where applicable, a connecting pipe or spool piece. In addition, it gives a method for establishing the combination discharge factor used in sizing combinations.

Related legislation

Legislation related to this standard


Directive 2014/68/EU of the European Parliament and of the Council of 15 May 2014 on the harmonisation of the laws of the Member States relating to the making available on the market of pressure equipment


Life cycle


EN ISO 4126-3:2006


EN ISO 4126-3:2020
60.60 Standard published
Sep 30, 2020