6 Commissioning/Start-up/Shutdown
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0570.81/22-EN
CAUTION
Aggressive flushing liquids and pickling agents
Damage to the valve!
▷
Ensure that cleaning procedure and duration match the valve body materials
and seal materials when performing flushing and pickling.
▷
Responsibility for the compatibility of the pickling media used and the pickling
procedure itself lies with the pickling company.
Functional check
The following functions must be checked:
1. Check the shut-off function of the installed valve prior to commissioning/start-
up by opening and closing the valve several times.
2. Check gland packing 461 for leakage when it is subjected to full operating
pressure and operating temperature for the first time.
3. If gland follower 452 is loose, evenly re-tighten nuts 920.1/920.2.
4. Always tighten nuts 920.4/920.6 of the studs 902.2 pre-loading bonnet 139 and
joint ring 411 under operating conditions to ensure that leakage at the pressure
seal bonnet/cover, which might be caused by bonnet 139 sinking as pressure
inside body 100 decreases, is avoided.
5. Check the joint between the body and the bonnet/cover established by bolting
902.1/904/920.1 and joint ring 411.1 for tightness after the valve has been
subjected to load conditions or heated up for the first time.
6. To avoid stress or distortion, open the valve by approx. two full counter-
clockwise handwheel turns.
7. If bonnet/cover bolting 902.1/904/920.1 has loosened, evenly re-tighten it
crosswise.
NOTE
Re-tightening the bonnet/cover bolting is particularly important for valves operated
at temperatures exceeding 200 °C.
Valves with actuator
On valves with electric, pneumatic or hydraulic actuators, the actuator strokes/forces
must be limited.
DANGER
Unqualified personnel performing work on valves with actuator
Danger of death from electric shock!
▷
Ensure that the connection to the power supply and the process control system
is performed by a trained electrician.
▷
Observe regulations IEC 60364 and, for explosion-proof models, EN 60079.
WARNING
Incorrect connection to the mains
Damage to the power supply network, short circuit!
▷
Observe the technical specifications of the local energy supply companies.
NOTE
If the valves are fitted with actuators, ensure that the actuator's operating manual
is also observed.
1. Check the available mains voltage against the data on the name plate of the
actuator.
2. Select an appropriate start-up method.
