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Servicing
9.2 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 actuator from the valve. See
associated actuator documentation.
Note
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.
Tip
We recommend removing the valve from the
pipeline before performing any service work
(see the 'Removing the valve from the pipe-
line' section).
The following service work can be per‑
formed after preparation is completed:
− Replacing the gasket (see section 9.4.1)
9.3 Completing service work
1. Mount actuator. See associated actuator
documentation.
2. Adjust lower or upper signal bench
range. See associated actuator docu‑
mentation.
9-6
3. Test the valve (see Table 9‑1). The tests
must be documented.
4. Put the control valve back into operation
(see the 'Start‑up' section). Make sure the
requirements and conditions for start‑up
or putting the valve back into operation
are met.
EB 8020 EN
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