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Application of the pressure equipment directive "PED" to safety valves

The Directive 97/23/EC (Pressure Equipment Directive "PED"), was approved on 29 November 1999 and became a mandatory reference on 29 May 2002, upon termination of the transition period.
The directive introduces a new framework of reference to be used for the manufacturing and marketing of components under pressure, contributing to the creation of a single European Market where the technical requirements for the building and use of equipment are the same.

The PED Directive applies to the design, manufacture and testing (enclosure I ß 2.11.1) of pressure equipment (subject to a maximum allowable pressure PS greater than 0.5 bar) and for the safety accessories such as (art.1 ß2.1.3) including safety valves, designed to protect equipment under pressure.

In virtue of their very important function, the safety valves are classified as "category IV", that is the highest risk category and the category subject to the procedure for verification of compliance with the essential safety requirements (modules), described in detail in Annex III of the Directive, foresees the application of Modules B+D where:

Module B
(EC type-examination)

L'ente notificato accerta e dichiara, rilasciando un certificato CE di tipo, dopo aver esaminato la documentazione tecnica delle valvole e dopo aver presenziato all'esecuzione delle prove sperimentali, che le valvole di sicurezza valutate soddisfano le disposizioni della Direttiva PED ad esse applicabili.

Module D
(Production quality assurance)

The production quality assurance system, other than being in compliance with the international regulation ISO 9001:2000, must guarantee the compliance of the product to the model subject of the type-examination.
The notified Body approves and supervises the quality system, carrying out inspections without prior notice. Tests and controls are performed on the products on occasion of these visits.

Only after having successfully passed these tests our safety valves can bear the CE mark followed by the identification number from the notified Body (Pascal Consortium no. 1115).