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Limits of Use
Operating Pressures and Temperatures
The valve to which these installation, operation and maintenance instructions apply have been
categorised in accordance with the Pressure Equipment Directive.
The fluid to be transported is limited to Group 2 liquids i.e. non-hazardous and on no account
must these valves be used on any Group 2 gases, Group 1 liquids or Group 1 gases.
Fig.370 and Fig.371 Bronze Drain Taps in sizes up to and including 1 inch are categorised as
SEP and do not require the CE mark.
PN
16
Not suitable for fatigue loading, creep conditions, fire testing, fire hazard environment, corrosive
or erosive service, transporting fluids with abrasive solids.
Pressure/Temperature Rating
Valves must be installed in a piping system whose normal pressure and temperature do not
exceed the above ratings.
The maximum allowable pressure in valves as specified in the standards is for non-shock
conditions. Water hammer and impact for example, should be avoided. If the limits of use
specified in these instructions are exceeded or if the valve is used on applications for which it
was not designed, a potential hazard could result.
Layout and Siting
It should be considered at the design stage where valves will be located to give access for
operation, maintenance or repair.
These drain taps may be installed in any orientation but attention should be paid to surrounding
structures, ensuring that the hose may be easily connected and that the valve operation is not
impaired.
Installation
Prior to installation, a check of the body marking must be made to ensure that the correct valve
is being installed.
1
Hattersley Bronze Draining Tap – Fig.370 & Fig.371
Non-shock pressure at
temperature range
16 bar from -10°C to 120°C
Non-shock pressure at max
temperature
16 bar at 120°C
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