Samson 3349 Mounting And Operating Instructions page 46

Start-up
WARNING
!
Risk of personal injury due to process me-
dium escaping.
Î Align the pipe elbow to ensure that any
escaping process medium does not hit
operating personnel.
Î Wear protective clothing (eye protection,
safety gloves) when working in close
proximity to the control valve.
NOTICE
!
Risk of impairment of aseptic or hygienic
service.
In the version with backup packing, the test
connection is sealed by a stopper.
Î To guarantee aseptic or hygienic service,
connect a leakage detection device to the
test connection.
NOTICE
!
Diaphragm damage through the use of an
incompressible medium.
Closing the valve when the shut-off valves
upstream and downstream of the valve are
closed may lead to the diaphragm rupturing
in plants with liquid media flowing through
them.
Î Only close the valve when the shut-off
valves upstream and downstream of the
valve are open.
6-2
Before start-up or putting the valve back into
service, make sure the following conditions
are met:
− The valve is properly installed into the
pipeline (see the 'Installation' section).
− The leak and function tests have been
completed successfully (see 'Testing the
installed valve' in the 'Installation' sec-
tion).
− The prevailing conditions in the plant
section concerned meet the valve sizing
requirements (see information under 'In-
tended use' in the 'Safety instructions
and measures' section).
Start-up/putting the valve back into opera-
tion
1. Allow the valve to cool down or warm up
to reach ambient temperature before
start-up when the ambient temperature
and process medium temperature differ
greatly or the medium properties require
such a measure.
2. Slowly open the shut-off valves in the
pipeline. Slowly opening these valves
prevents a sudden surge in pressure and
high flow velocities which can damage
the valve.
3. Check the valve to ensure it functions
properly.
EB 8048-2 EN