EB 8097 EN 9-3
Servicing
Risk of control valve damage due to over-
or under-torquing.
Observe the specied torques when tighten-
ing control valve components. Excessive
tightening torques lead to parts wearing out
more quickly. Parts that are too loose may
cause leakage.
Î Observe the specied tightening torques
(see the 'Tightening torques, lubricants
and tools' chapter in the Appendix).
Risk of valve damage due to the use of un-
suitable tools.
Î Only use tools approved by SAMSON
(see the 'Tightening torques, lubricants
and tools' chapter in the Appendix).
Risk of valve damage due to the use of un-
suitable lubricants.
Î Only use lubricants approved by SAM-
SON (see the 'Tightening torques, lubri-
cants and tools' chapter in the Appen-
dix).
The control valve was checked by SAMSON
before delivery.
− Certain test results certied by SAMSON
lose their validity when the valve is
opened. Such testing includes seat leakage
and leak tests.
− The product warranty becomes void if ser-
vice or repair work not described in these
instructions is performed without prior
agreement by SAMSON's After-sales Ser-
vice.
− Only use original spare parts by SAM-
SON, which comply with the original spec-
ications.
9.1 Periodic testing
Depending on the operating conditions,
check the valve at certain intervals to prevent
possible failure before it can occur. Plant op-
erators are responsible for drawing up an
inspection and test plan.
Our after-sales service can support you in
drawing up an inspection and test plan for
your plant.
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-
NOTICE
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NOTICE
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NOTICE
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