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− Replace the bottom gasket as described
in section 9.4.2.
− Replace the packing (see section 9.4.3)
− Replace the seat and plug (see sec-
tion 9.4.4)
9.3 Installing the valve after
service work
1. Mount actuator. See associated actuator
documentation and the 'Installation' sec-
tion.
2. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.
3. If the valve has been removed, re-install
the valve into the pipeline (see the 'Instal-
lation' section).
4. 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.
9.4 Service work
Î Before performing any service work,
preparations must be made to the control
valve (see section 9.2).
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).
EB 8060 EN
9.4.1
Replacing the top gasket
NOTICE
!
Risk of control valve damage due to incor-
rect servicing.
Î The gasket can only be replaced when
all the following conditions are met:
− The valve size is ≤DN 100.
− The valve does not have a balanced
plug.
− The valve does not have a flow
divider.
Î To replace the gasket in other valve ver-
sions, contact our after-sales service.
a) Standard version
1. Undo the top body nuts (14) gradually in
a crisscross pattern.
2. Lift the bonnet (2) and plug with plug
stem (5) off the body (1).
3. Remove the top gasket (17). Carefully
clean the sealing faces in the valve body
(1) and on the bonnet (2).
4. Insert a new gasket (17) into the body.
5. Place the bonnet (2) onto the body.
Version with V-port plug: place the bon-
net (2) onto the valve body, making sure
that the largest V-shaped port of the
V-port plug faces towards the valve out-
let.
Version with perforated plug: place the
bonnet (2) onto the valve body, making
sure that the hole of the plug that releas-
Servicing
9-7
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