In accordance with annex II point 3, pressure accessories have to be classified using the appropriate table(s) of annex II on the basis of their PS, their V and/or DN, and the group of fluids for which they are intended. Pressure accessories with low PS, volume and/or DN will therefore fall under the requirements of article 4 par. 3. Such pressure accessories do not have to satisfy the essential requirements but only sound engineering practice (SEP).
Reason:
Requirements in annex II are more precise and should prevail.