EB 8091 EN 9-13
Servicing
9.4.3 Replacing the seat and
plug
Risk of control valve damage due to incor-
rect servicing.
Î Only exchange the seat and plug in
valves without bellows seal.
Î To replace seat and plug in other valve
versions, contact our after-sales service.
Incorrect control due to a combination of
trim parts that do not match each other.
The trim parts (seat, plug, anti-rotation x-
ture and body gasket) are matched to ex-
actly t each other.
The anti-rotation xture must also be ex-
changed on replacing the seat and plug. The
trim parts are delivered together and marked
accordingly (see the 'Markings on the de-
vice' section).
Î Only install matching trim parts.
Risk of damage to the facing of the seat
and plug due to incorrect servicing.
Î Always replace both the seat and plug.
Î Only install matching trim parts (see the
'Markings on the device' section).
a) Standard version
See Fig.9-1
1. Loosen the slotted nut (11) at the valve.
Remove the yoke (13) from the interme-
diate piece (4).
2. Unscrew the llister head screw (6) on
the anti-rotation xture (2.4). Remove the
anti-rotation xture (2.4) from the inter-
mediate piece (4).
3. Unscrew the intermediate piece (4) from
the body (1). Remove the intermediate
piece (4) together with plug (2.1) from
the body (1).
4. Replace the gasket as described in sec-
tion9.4.1.
5. Unscrew the hex nuts (20) from the plug
stem (2.1). Remove the stem connector
parts.
6. Unscrew the threaded bushing (12).
7. Replace the packing. See section9.4.2.
8. Unscrew the seat (2.2) 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 (2.2) using a suitable
tool. Observe tightening torques.
11. Pull the plug with plug stem (2.1) out of
the intermediate piece (4).
12. Apply a suitable lubricant to the new
plug stem (2.1) and thread of the inter-
mediate piece (4).
13. Slide the new plug with plug stem (2.1)
into the intermediate piece (4).
NOTICE
!
NOTICE
!
NOTICE
!
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