Leser 4401 Instrucciones De Servicio página 14

Operating Instructions
Flow-off from the pop action pilot into the
EN
atmosphere must always be possible.
Safety valves must be installed such that
no inadmissibly high static and thermal
stress can be transferred to the safety
valve from the supply and discharge lines.
Pipes may only be connected in operation
without force and torque.
Reaction forces during the blow-off and
temperature expansion during operation
must also be taken into consideration dur-
ing installation. During the installation, any
occurring reaction forces during blow-off
and any temperature expansion during op-
eration must also be taken into considera-
tion.
The blow-off lines must be installed in a
way that is flow-optimised. Depending on
the designated use, the blow-off lines must
have different discharge directions. There
is a differentiation between discharge lines
for vapours or gases and discharge lines
for fluids.
The discharge line for discharging va-
pours or
such that they rise in order to guaran-
tee discharging
In order to drain the discharge line, the
discharge line must be attached such
that it has a downward slope to the drain-
age opening at the lowest point. Correct
drainage is only possible if the discharge
line directly behind the safety valve has a
downward slope so that the medium can
completely drain off. The discharge line
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gases must be
without any
must not have a direct upwards slope be-
hind the safety valve.
The drainage opening must be placed at
the lowest point of the discharge line. The
drainage opening must be dimensioned
adequately and be freely accessible with a
possibility to be monitored. Escaping me-
dia must be collected (e.g. through conden-
sate collectors, collecting tanks or filters).
If a drainage opening or control thread is
placed directly on the safety valve or bon-
net, then it must be protected by safety
guards so that neither moisture nor dirt can
get in.
Pressure and temperature limits of safety
valves with bellows must be observed. De-
fective bellows can be recognised by fluid
escape from the open bonnet or the control
thread in the case of closed bonnets. Dan-
ger from the escaping fluid must be ruled
out.
The open inspection hole ensures a con-
stant pressure equalisation between the
bonnet space and the environment. The
open inspection hole poses a risk to the
attached functioning of the valve under certain con-
ditions. Reasons for this may include: the
danger. penetration of moisture and icing, the es-
caping of critical media or insect nests.
Preventive measures must be taken in this
regard. The operator may determine – with
the responsible monitoring organisation, if
required – that the inspection hole on the
bonnet is to be closed with screw plugs or
screws.