Samson 3246, Монтаж и эксплуатация

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9-4 EB 8046 EN
Servicing
9.2 Preparing the valve for
service work
Risk of personal injury due to incorrect
removal of the anti-rotation fixture under
tension.
Once the actuator has been mounted on the
valve and the assembly is ready for use, the
clamps (301) of the anti-rotation fixture on
the plug stem are under tension.
Î
Follow the instructions in this document
during mounting or removal.
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Do not loosen the screws (303) of the
anti-rotation fixture while the force
generated by the supply air and/or the
actuator springs is transmitted to the
actuator stem and the stem (9).
Î
First remove the actuator from the valve
or ensure it cannot transmit any forces to
the actuator stem before removing the
anti-rotation fixture on the plug stem.
1. Lay out the necessary material and tools
to have them ready for the service work.
2. Put the control valve out of operation (see
the 'Decommissioning' section).
3. Remove the actuator from the valve for
the following service work (see associat-
ed actuator documentation):
− ‘Replacing the gasket’
− Replacing the circulation inhibitor ->
‘Globe valve, Class 600 and 900/
PN 100 and 160’
− Replacing the packing -> ‘Globe
valve, Class 150 and 300/PN 16
and 40’
− Replacing the packing -> ‘Globe
valve, Class 600 and 900/PN 100
and 160’
WARNING !
Inspection and testing Action to be taken in the event of a negative result:
Check to ensure that the actuator and
plug stem move smoothly.
Unblock a blocked actuator and plug stem.
WARNING! A blocked actuator or plug stem (e.g. due to
seizing up after remaining in the same position for a long
time) can suddenly start to move uncontrollably. Injury to
hands or fingers is possible if they are inserted into the
actuator or valve.
Before trying to unblock the actuator or plug stem,
disconnect and lock the pneumatic air supply as well as the
control signal. Before unblocking the actuator, release any
stored energy in the actuator (e.g. spring compression). See
associated actuator documentation.
If possible, check the valve's fail-safe
position by briefly interrupting the air
supply.
Put the control valve out of operation (see the
'Decommissioning' section). Identify the cause for the
malfunction and rectify it (see the 'Troubleshooting' section).