Note!
The tightening torques and special tools re-
quired for installing and removing the seat
are listed in the table on page 9.
Important!
Prior to carrying out any repairs, always
separate the actuator from the valve by re-
moving the stem connector clamps (7) and
the nut (9). Then lift the actuator off the valve.
4.1 Replacing the metal bellows
Leakage occurring at the packing box is
due to a damaged metal bellows. The com-
plete bellows assembly as well as the pack-
ing (4.2) must be replaced as described
below.
It is recommended that the sealing ring
(5.3) at the top of the bellows housing and
the gasket (1.2) at the bottom of the bellows
housing be replaced, too.
Disassembly:
1. With nominal sizes DN 15 to 50, un-
screw the stem connector nut (6.1) and
lock nut (6.2).
2. First unscrew the coupling nut (5.1).
Next, remove the nuts (1.1). After that,
lift and remove the flange (5.4). Then
remove the complete bonnet from the
valve body.
3. Securely hold the flattened plug stem
end by the flats (x) using an open-end
wrench (width across flats SW 10 for DN
15 to 50 and SW 13 for DN 65/80)
while unthreading the screw (6.3).
4. First remove the valve plug (3). Then
remove the guide (15) with nominal
sizes DN 15 to 25, the cap (14) with
DN 32 to 50 and the cap (14), bushing
(13), washer (12), spring (11) and
washer (10) with DN 65/80.
Pull the bellows assembly (5) out of the
bellows housing (5.2) and remove the
sealing ring (5.3).
5. Clean all parts thoroughly and check
them for signs of damage.
Replace the bellows assembly consisting
of the plug stem, the metal bellows and
the packing.
Reassembly:
1. Apply lubricant (order no. 8150-0119)
to the sealing ring (5.3) and the
threaded part of the bellows housing,
then place the sealing ring onto the bel-
lows housing.
Insert the bellows assembly (5) with the
plug stem into the bellows housing and
slide the flange (5.4) over the bellows
housing. Tighten the coupling nut (5.1)
finger tight only.
2. With nominal sizes DN 15 to 50, slide
the guide (15) or cap (14) onto the plug
stem and with nominal sizes 65/80,
slide the washer (10), spring (11),
washer (12), bushing (13) and cap (14)
onto the plug stem.
Apply lubricant (order no. 8150-0119)
to the screw thread, place the washer
(6.4) and valve plug (3) on the screw
(6.3) and firmly tighten the screw into
the plug stem.
CAUTION!
In doing so, use an open-end wrench
on the flattened end of the plug stem (X)
to hold the stem in place and to prevent
the metal bellows from being rotated.
8
EB 8131/8132 EN
Maintenance replacing parts
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