PN25 Butterfly Valve
Fig. 4925 Butterfly Valve
Fig. 4923 Butterfly Double-Regulating Valve
CE MARKING AND THE PRESSURE
EQUIPMENT DIRECTIVE 2014/68/EU
The Pressure Equipment Directive applies to all valves with a maximum
allowable pressure greater than 0.5 bar. Valves with a maximum allowable
pressure not exceeding 0.5 bar are outside the scope of the Directive. Valves
are categorised in accordance with the maximum working pressure, size and
ascending level of hazard, which is dependent on the fluid being transported.
Fluids are classified as Group 1, dangerous fluids or Group 2, all other fluids
including steam. Categories are SEP (sound engineering practice) and for
ascending levels of hazard, I, II, III or IV. All valves designated as SEP do not
bear the CE mark nor require a Declaration of Conformity. Categories I, II, III or
IV carry the CE mark and require a Declaration of Conformity (Note- all valves
up to and including 25mm (1”) having a maximum allowable pressure greater
than 0.5 bar are designated SEP regardless of fluid group.)
PRODUCT LIFE CYCLE
The life of the valve is dependent on its application, frequency of use and
freedom from misuse. Compatibility with the system into which it is installed
must be considered. Valves must be installed into a well-designed system
and it is recommended that the system be inspected in accordance with the
appropriate national and regional legislation. The properties of the fluid
being transported such as pressure, temperature and the nature of the fluid
must be taken into account to minimise or avoid premature failure or non-
operability. A well-designed system will take into consideration all the
factors considered in the valve design, but additionally electrolytic
interaction between dissimilar metals in the valve and the system must be
examined. Before commissioning a system, it should be flushed to
eliminate debris and chemically cleaned as appropriate to eliminate
contamination, all of which will prolong the life of the valve.
Installation and Operating Instructions
