Replacing The Seat And Plug - Samson 3246 Mounting And Operating Instructions

9.4.4 Replacing the seat and
plug
NOTICE 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 gasket (see sec-
tion 9.4.1), the circulation inhibitor (see sec-
tion 9.4.2) and the packing (see sec-
tion 9.4.3).
a) Globe valve, Class 150 and
300/PN 16 and 40
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 ≤NPS 6/≤DN 150.
− The standard packing is installed in
the valve.
Î To replace seat and plug in other valve
versions, contact our after-sales service.
1. Undo the body nuts (14) gradually in a
crisscross pattern.
EB 8046 EN
2. Lift the insulating section (21) together
with the plug stem extension (25), plug
stem and plug (5) off the body (1).
3. Replace the gasket (see section 9.4.1)
4. Undo the grub screw (88) at the bottom
threaded bushing (87) using a hex sock-
et screw.
Note
Do not completely unscrew the grub screw.
5. Loosen threaded bushing (87).
Note
The threaded bushing does not need to be
completely unscrewed on replacing the seat
and plug.
6. Replace the circulation inhibitor (see sec-
tion 9.4.2).
7. Unscrew the seat (4) using a suitable
tool.
8. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
9. Screw in the seat (4). Observe tightening
torques.
10. Unscrew the plug and plug stem (5) from
the plug stem extension (25) using a suit-
able tool and take them out of the insu-
lating section (21).
11. Apply a suitable lubricant to the end of
the plug stem of the new plug (5).
12. Make sure that the two retaining washers
(30) are still in the plug stem extension
(25). Renew the washers, if necessary.
Servicing
9-13