Preparing The Valve For Service Work; Mount The Valve After Service Work - Samson 3372 Mounting And Operating Instructions

Tip
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drawing up an inspection and test plan for
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9.2 Preparing the valve for
service work
1. Lay out the necessary material and tools
to have them ready for the intended
work.
2. Put the actuator out of operation (see the
'Decommissioning' section).
3. Remove the actuator from the valve (see
the 'Removal' section).
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 the 'Removal'
section). Afterwards, the signal pressure
must be removed and the air supply discon-
nected again and locked.
4. Relieve the compression from the pre-
loaded springs. See 'Relieving the spring
compression in the actuator' in the 'Re-
moval' section.
5. Unthread and remove the nuts and bolts
(including the washers) from around the
actuator casing.
The following service work can be per-
formed after preparation is completed:
EB 8313-3 EN
Service and conversion work
− Replace the diaphragm (see sec-
tion 9.4.1).
− Replace the actuator stem seals (see sec-
tion 9.4.2).
9.3 Mount the valve after ser-
vice work
1. Mount the actuator (see the 'Mounting
and assembly' section).
2. Adjust the upper or lower bench range
values (see the 'Start-up' section).
9-3