Checking The Extent Of Servicing; Preparing The Valve For Service Work; Installing The Valve After Service Work; Service Work For Version With Type 3271 Or Type 3277 Actuator - Samson 3349 Mounting And Operating Instructions

Servicing
NOTICE
!
Risk of the process medium being contami-
nated through the use of unsuitable lubri-
cants and/or contaminated tools and com-
ponents.
Î Keep the valve and the tools used free
from solvents and grease.
Î Make sure that only suitable lubricants
are used.
Note
The control valve was checked by SAMSON
before delivery.
− Certain test results certified by SAMSON
lose their validity when the valve is
opened. Such testing includes seat leakage
and leak tests.
− The product warranty becomes void if
service or repair work not described in
these instructions is performed without
prior agreement by SAMSON's After-sales
Service.
− Only use original spare parts by
SAMSON, which comply with the original
specifications.
9.1 Checking the extent of
servicing
Î Check wear at seat and plug. Replace
the damaged plug (see section 9.4.2 or
9.5.2).
Î Check the diaphragm for damage (e.g.
cracks, milky coloring at the bends). Re-
42
place the damaged diaphragm (see sec-
tion 9.4.2 or 9.5.2).
Î If the valve leaks even if the diaphragm
is intact, check the tightening torque of
the joint between plug and plug stem as
well as body and bonnet/flange.
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
section 10).
3. Remove the valve from the pipeline (see
section 11).
9.3 Installing the valve after
service work
1. Reinstall the valve into the pipeline (see
section 5).
2. Put the control valve back into operation
(see section 6). Observe the requirements
and conditions for start-up or putting the
valve back into operation.
9.4 Service work for version
with Type 3271 or
Type 3277 Actuator
Î Before performing any service work,
preparations must be made to the control
valve (see section 9.2).
EB 8048-21 EN