Samson 3347-1 User Manual

12 EB 8097 EN
Maintenance
6 Maintenance
If the valve leaks, the wiper (5.3), steam seal
(5.1), or PTFE V-ring packing (4.2) (in the
version with steam line connection) might be
defective.
If the valve does not close tightly, tight shut-
off may be impaired by dirt stuck between
the seat and plug or by damaged facings.
We recommend removing the parts, cleaning
them, and, if necessary, replacing them with
new ones.
− Before performing any work on the control
valve, make sure the relevant plant section
has been depressurized and, depending
on the process medium, drained as well.
− When used at high temperatures, allow the
plant section to cool down to ambient tem-
perature.
− As valves are not free of cavities, remem-
ber that residual process medium might still
be contained in the valve. We recommend
removing the valve from the pipeline or the
entire valve construction when the valve is
welded into the pipeline.
− Before starting any work on the valve
body, disconnect the signal pressure and
remove the signal pressure line as well as
the actuator.
− During disassembly or assembly of the
valve, make sure that the stem seal (5.1) is
not damaged. The plug must not be moved
beyond the valve travel.
6.1 Replacing sealing parts
and plug
Before starting any work on the valve body,
remove the actuator from the valve.
1. Apply a signal pressure that is higher
than the lower bench range value to the
actuator (see nameplate).
2. Remove the stem connector clamps (7)
between the actuator stem and the plug
stem and unscrew the ring nut (8.2).
3. Lift the actuator off the valve.
4. Remove nuts (6.1 and 6.2).
5. Remove the clamp (5.4). Remove the
valve bonnet (5) together with plug (3)
and centering ring (1.1).
6. Pull the plug out of the valve bonnet.
Make sure that the stem seal (5.1) is not
damaged.
7. Use a suitable tool to force out damaged
parts, e.g. wiper (5.3) and stem seal
(5.1).
In version with steam line connection, al-
so remove packing (4.2), washer (4.3),
and spring (4.1). Clean the packing
chamber.
8. Check the surface of the plug stem to en-
sure it is free of score marks and still has
a mirror nish. Repolish the surface with-
out any aws to ensure the stem seal
cannot get damaged.
9. Apply a suitable lubricant to the new
parts and plug stem.
GEFAHR
!
WARNING
!
NOTICE
!

Samson 3347-1 Specifications

General

Brand	Samson
Model	3347-1
Category	Control Unit
Language	English