Replacing The Seat And Plug - Samson 3321CT Mounting And Operating Instructions

6
9
4
4 Guide bushing
5 Spring
6 Washer
8 Packing
Fig. 9-5: Packing for DN 65 to 80
9.4.3 Replacing the seat and
plug
NOTICE NOTICE
! !
Risk of damage to the facing of the seat
and plug due to incorrect service or repair.
Î Always replace both the seat and plug.
EB 8115 EN
12
11
5
15
8
9 Spacer
11 Retaining washer
12 Retaining ring
15 Centering pin
Tip
When replacing the seat and plug, we also
recommend replacing the gasket and pack-
ing. See sections 9.4.1 and 9.4.2.
1. Undo the screws (10) on the valve bon-
net (7).
2. Lift the actuator, flange (14), valve bon-
net (7) and plug with plug stem (3) off
the body (1).
3. Replace the gasket (see section 9.4.1)
4. Unscrew the seat (4) using a suitable
tool.
5. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
6. Screw in the seat (4). Observe tightening
torques.
7. Unscrew the valve bonnet (7) from the
actuator base.
8. Unscrew the plug stem (3) from the actu-
ator stem.
9. Pull the plug with plug stem (3) out of the
valve bonnet (7).
10. Pull the entire packing out of the packing
chamber using a suitable tool.
11. Apply a suitable lubricant to all the pack-
ing parts and to the new plug stem (3).
We recommend replacing the packing as
well. See section 9.4.2.
12. Make sure that the guide bushing (4)
and spacer (9) are seated correctly in the
valve bonnet (7).
Servicing
9-7