9-4 EB 8048-2 EN
Servicing
9.3 Preparing the valve for
service work
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 valve from the pipeline (see
the 'Removal' section).
9.4 Installing the valve after
service work
1. Reinstall the valve into the pipeline (see
the 'Installation' section).
2. Put the control valve back into operation
(see the 'Start-up' section). Observe the
requirements and conditions for start-up
or putting the valve back into operation.
9.5 Service work for version
with Type3271 or
Type3277 Actuator
See Fig.9-2
Î Before performing any service work,
preparations must be made to the control
valve (see section9.3).
Î After all service work is completed, check
the control valve before putting it back
into operation (see 'Testing the installed
valve' in the 'Installation' section).
To remove an actuator with "stem extends"
fail-safe action and/or with preloaded
springs, a certain signal pressure must be
applied to the actuator (see associated actu-
ator documentation). Afterwards, the signal
pressure must be removed and the air supply
disconnected again and locked.
9.5.1 Replacing the packing
(micro-ow valve ver-
sion only)
19
20.
5.2
3
Fig.9-1: Packing (with Type3271/3277 Actu-
ator)
1. Remove the actuator from the valve. See
associated actuator documentation.
2. Undo the screws (34).
3. Lift the valve bonnet (20.1) together with
the plug stem (3), plug (2) and dia-
phragm (24) off the body (1).
4. Unscrew the threaded bushing (5.2).
5. Pull the plug (2) with plug stem (3) and
diaphragm (24) out of the valve bonnet
(20.1).
6. Pull the entire packing parts (15, 19, 23)
out of the packing chamber using a suit-
able tool. Renew the damaged parts and
carefully clean the packing chamber.
Note
2
1
24
3
20.1
20.2
5.2
23
15
19
41
36
39
Fig.9-2: Type3349 Valve with Type3271 Pneumatic Actuator
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