Replacing The Seat And Plug - Samson 3254 Mounting And Operating Instructions

Servicing
Insert the wire of the red spacer ring
(15.1) into the groove of the retaining
ring.
Slide the retaining ring over the plug
stem.
4. Insert the red spacer ring (15.1) between
the threaded bushing (8) and retaining
ring. See Fig. 9-3.
5. Proceed as described in 'Standard pack-
ing (PTFE)', steps 13 to 16.
9.4.4 Replacing the seat and
plug
NOTICE
!
Risk of control valve damage due to incor-
rect servicing.
Î Seat and plug can only be replaced
when all the following conditions are
met:
− The valve size is ≤DN 100.
− The valve does not have a balanced
plug.
− The valve does not have a bellows
seal.
− The valve does not have a flow divid-
er.
− The valve does not have an AC trim.
− The standard or ADSEAL packing is
installed in the valve.
Î To replace seat and plug in other valve
versions, contact our after-sales service.
9-14
NOTICE
!
Risk of damage to the facing of the seat
and plug due to incorrect servicing.
Î Always replace both the seat and plug.
Tip
When replacing the seat and plug, we also
recommend replacing the packing (see sec-
tion 9.4.3).
a) Standard version
1. Unscrew the castellated nut (92) and lift
the yoke (3) off the bonnet (2).
2. Undo the top body nuts (14) gradually in
a crisscross pattern.
3. Lift the bonnet (2) and plug with plug
stem (5) off the body (1).
4. Replace the top gasket as described in
section 9.4.1.
5. Unscrew the stem connector nut (9) and
lock nut (10) from the plug stem.
6. Unscrew the threaded bushing (8).
7. Pull the plug with plug stem (5) out of the
bonnet (2).
8. Pull the entire packing out of the packing
chamber using a suitable tool.
9. Make sure that the top guide bushing (7)
is not damaged. If necessary, replace the
guide bushing using a suitable tool.
10. Unscrew the seat (4) using a suitable
tool.
EB 8060 EN