6-2 EB 8097 EN
Start-up
Risk of contamination of the process me-
dium through high pressure in the steam
barrier.
A pressure in the steam barrier (steam or
sterile uid) that is higher than the pressure
in the valve itself may affect the process me-
dium inside the valve due to it be mixed with
the steam (or sterile uid).
Î Observe the relevant hygiene regula-
tions.
Before start-up or putting the valve back into
service, make sure the following conditions
are met:
− The control valve is properly installed in
the pipeline (see the 'Installation' chap-
ter).
− The leak and function tests have been
completed successfully (see the 'Testing
the installed valve' chapter).
− The prevailing conditions in the plant
section concerned meet the valve sizing
requirements (see section 'Intended use'
in the 'Safety instructions and measures'
chapter).
Start-up/putting the device back into oper-
ation
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 ow velocities which can damage
the valve.
3. Check the valve to ensure it functions
properly.
NOTICE
!
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