Samson 3271 - 9.2 Service Work Preparations

9-6 EB 8026 EN
Servicing
9.2 Service work preparations
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' chapter).
3. Remove the actuator from the valve. See
associated actuator documentation.
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.
SAMSON recommends removing the valve
from the pipeline before performing any ser-
vice work (see the 'Removing the valve from
the pipeline' chapter).
The following service work can be per-
formed after preparation is completed:
− Replace the gasket (see Chapter9.4.1)
− Replace the packing (see Chapter9.4.2)
9.3 Installing the valve after
service work
1. Mount actuator. See associated actuator
documentation.
2. Adjust lower or upper signal bench
range. See associated actuator docu-
mentation.
3. Put the control valve back into operation
(see the 'Start-up' chapter). 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 Chapter9.2).
Î After all service work is completed, check
the control valve before putting it back
into operation (see section 'Testing the in-
stalled valve' in the 'Installation' chap-
ter).
Note
Tip