10
5 FT 70 en
Remove the ball (3) by turning it so that the shaft
holes in the ball (3) are parallel to the valve body (1)
flow bore.
Remove the seat (7), back seal (6), support ring (8)
and the spring (5). Note that part (4) is locked with a
special tool to the valve body and is not recom-
mended to be removed.
Assemble a new back seal (6) into a new seat (6).
Push the support ring (8) on the seat (6) following
with the spring (5). Push these parts as a package in
the body cavity. Note that part (4) is factory locked to
the body and should not have been removed.
Put the lower bearing (17) on the shaft (12) and the
upper bearing (17) in the body cavity. Check that the
pin holes in the ball (3) have not been damaged dur-
ing dismantling.
Assemble the ball (3) in the body and the shafts
(11,12) through the shaft holes so that the pin holes
are parellel with each other. Press the pins into the
ball/shaft holes and lock them with a centre punch.
Assemble the seal (19), blind flange (10) and the
hexagon screws (26) and tighten.
Assemble and tighten the studs (24), insert packing
rings (20), gland (9), retainer plates (30), disc spring
sets (32) and the nuts (25) and tighten.
Insert the key (13) in the drive shaft (11) keyway.
4.7
Dismantling the valve
4.7.1
FC series
Remove the valve from the pipeline and dismantle
the packing (69) as described above (see Section
4.3).
Remove the locking shoulders of the insert (2) and
unscrew the insert using a special tool, see exploded
view and parts list in Section 10. The special tool is
available from the valve manufacturer.
Remove the back seal (63) and unscrew the seat (7)
from the valve body.
Unfasten the nuts (17) of the bonnet. Pull the bonnet
out and remove the bonnet seal (66) from under the
bonnet.
Pull the stem (5) out from the body (1).
Remove the plug (3) from the body through the flow
opening.
Detach the upper bearing (15) from the body by tap-
ping it through the stem bore, using a suitable bar.
Do not use the stem!
Detach the lower bearing using a special tool and
drive shaft. Set up the tool as illustrated in Fig. 17.
Use a soft hammer to carefully hit shaft end. This will
detach the bearing.
4.7.2
FL series
Turn the valve into closed position and place it verti-
cally the seat side pipe flange toward a planar sur-
face. Make sure that the surface is soft enough to
prevent the pipe flange surface damages.
There are two alternatives to remove the pins:
a) Carefully drill a 2 mm hole that is 10…12 mm
deep to both pins (14) and remove the pins (14),
shaft (12) and drive shaft (11),
b) If the pin drilling is made through the ball,
remove the pin locking made with centre punch
carefully by drilling. Turn the ball 180 degrees and
push the pins via the hole. See Fig. 18.
Remove the key (13) from the shaft (11). Unfasten
the blind flange bolts (26) and remove the blind
flange (10) and seal (19). Unfasten the nuts (25) and
remove the disc spring sets (32), retainer plates (30)
and gland (9). Remove the bearings (16, 17).
Remove the ball (3) by turning it so that the shaft
holes in the ball (3) are parallel to the valve body (1)
flow bore.
Remove the seat (7), back seal (6), support ring (8)
and the spring (5). Note that part (4) is locked with a
special tool to the valve body and is not recom-
mended to be removed.
4.8
Cleaning and inspection of removed
parts
We recommend that soft material parts be replaced when-
ever the valve is dismantled for servicing. Clean the other
parts removed. If you use a detergent, rinse the parts care-
fully after washing. Handle detergents with sufficient care
and follow the instructions for their use. Check the parts for
wear and replace worn parts. The insert (2) must be
changed when the seat (7) is changed.
Fig. 17
Removal of the lower bearing
Fig. 18
Drilling the pin, FL
Phase 1
Phase 2
Water or
grease
Remove the lockring
Drill a hole
on the pin
Push the pin out
Pin size: ø3x16
