Replacing The Seat And Plug - Samson 3281 Mounting And Operating Instructions

9.4.3 Replacing the seat and
plug
NOTICE
!
Risk of control valve damage due to
incorrect servicing.
Î Seat and plug can only be replaced
when all the following conditions are
met:
− The valve size is ≤DN 150.
− The valve does not have a balanced
plug.
− The valve does not have a bellows
seal.
− The valve does not have an insulating
section.
− The standard packing, form H or
form HT packing is installed in the
valve.
Î To replace seat and plug in other valve
versions, contact our after-sales service.
NOTICE
!
Risk of damage to the facing of the seat
and plug due to incorrect servicing.
Î Always replace both the seat and plug.
1. Unscrew the castellated nut (92) and lift
the yoke (3) off the bonnet (2).
2. Undo the 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 gaskets as described in sec-
tion 9.4.1.
EB 8251 EN
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. Replace the packing (see section 9.4.2)
9. Make sure that the guide bushing (7) is
not damaged. If necessary, replace the
guide bushing using a suitable tool.
10. Remove clamping element (63) and flow
divider (62).
11. Unscrew the seat (4) using a suitable
tool.
12. Apply a suitable lubricant to the thread
and the sealing cone of the new seat.
13. Screw in the seat (4). Observe tightening
torques.
14. Clamp the flow divider (62) on the seat.
Mount the clamping element (63).
15. Slide the new plug with plug stem (5) in-
to the bonnet (2).
16. Place the bonnet (2) together with the
plug stem and plug (5) onto the body
(1).
Version with V-port plug: place the bon-
net (2) onto the valve body, making sure
that the largest V-shaped port of the
V-port plug faces towards the valve out-
let.
Version with perforated plug: place the
bonnet (2) onto the valve body, making
sure that the hole of the plug that releas-
es the flow first faces toward the valve
outlet.
Servicing
9-11