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4.3
Detaching the actuator
It is generally most convenient to detach the actuator
and its auxiliary devices before removing the valve from
the pipeline. If the valve package is small or if it is diffi-
cult to access, it may be more practical to remove the
entire package at the same time.
See Section 6 for details of detaching actuators.
4.4
Removing the valve from the pipeline
❑
Make sure that the pipeline is not pressurized
and that it is empty. Also make sure that no
medium is led into the pipeline while the valve is
being removed or after it has been removed.
❑
Place the hoisting ropes carefully, unscrew the
pipe flange bolts and lift the valve from the pipe-
line using the ropes. Note the correct lifting
method. See also Fig. 7.
4.5
Replacing the seat
4.5.1
Detaching the seat
❑
The valve must be removed from the pipeline.
❑
Turn the segment (3) so that it does not touch the
seat, Fig. 14.
❑
In DN 25-100 valves (excluding the low-Cv ver-
sions), unfasten the blind flange (10) and push
the segment into the back position, Fig. 15.
❑
DN 25-100 valves can be dismantled, as
described in 4.6, to make the replacement of the
seat easier. Dismantling is always necessary
when a DN 25 / 1" valve has a low-Cv segment.
Fig. 13
Installing the retainer plates
Table 3
Tightening of the gland packing
Valve size
A (mm)
Hc (mm)
Tt (Nm)
DN 25 / 01
20
20.5
5
DN 40 / 1H
20
20.5
5
DN 50 / 02
20
20.5
5
DN 65 / 2H
20
20.5
5
DN 80 / 03
20
20.0
7
DN 100 / 04
20
20.0
7
DN 150 / 06
25
29.0
12
DN 200 / 08
25
29.0
14
DN 250 / 10
25
28.0
16
DN 300 / 12
25
28.0
18
DN 350 / 14
35.5
38.0
38
DN 400 / 16
35.5
37.0
45
DN 500 / 20
40
42.0
70
DN 600 / 24
40
41.5
90
DN 700 / 28
40
41.5
90
CAUTION:
When handling the valve or the valve package,
take its weight into account!
NOTE:
Before dismantling, carefully observe the position of
the valve in relation to the actuator and positioner/limit
switch so as to make sure that the package can be
properly re-assembled.
CAUTION:
Do not dismantle the valve or remove it from the
pipeline while the valve is pressurized!
Fig. 14
Turning the ball segment
Fig. 15
Removing the blind flange
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