Hattersley 370 Installation And Operating Instructions

Installation and Operating Instructions
Bronze
Draining Tap
Fig.370 & Fig.371
CE Marking and the Pressure Equipment Directive 97/23/EC
This has been implemented in United Kingdom law by the Pressure Equipment Regulations
1999 (SI 1999/2001).
The regulations apply 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.
The system into which it is installed must also be compatible with respect to the fluid being
transported with reference to its temperature, pressure and other properties, which may cause
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.