Replacing The Seat And Plug - Samson EB 8015 EN Mounting And Operating Instructions

− Packing rings (16)
3. Slide the seals (15.2) over the plug stem
extension.
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 extension.
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 10 to 12.
9.4.3 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 nominal size is ≤DN 150.
− The valve does not have a balanced
plug.
− The valve does not have a bellows
seal.
− The seat is screwed into the valve
body as a separate part.
− 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.
EB 8015 EN
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, SAM-
SON also recommends replacing the pack-
ing (see Chapter 9.4.2).
a) Standard version
1. Undo the body nuts (14) gradually in a
crisscross pattern.
2. Lift the flange (2) and plug with plug
stem (5) off the body (1).
3. Replace the gasket. See Chapter 9.4.1,
section a).
4. Unscrew the stem connector nut (9) and
lock nut (10) from the plug stem.
5. Unscrew the threaded bushing (8).
6. Pull the plug with plug stem (5) out of the
flange (2).
7. Pull the entire packing out of the packing
chamber using a suitable tool.
8. Unscrew the seat (4) using a suitable
tool.
9. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
10. Screw in the seat (4). Observe tightening
torques.
11. Apply a suitable lubricant to all the pack-
ing parts and to the new plug stem (5).
Servicing
9-13