1 D 71 en
11
value of compression (h
1
–h
2
) as in Table 2. See
also Fig. 20.
❑
Carry out 3…5 operation cycles with the valve.
Suitable range of movement is about 80 %.
It is not necessary to fully close or open the valve
during the operation.
❑
Unfasten the nuts and disc springs.
❑
Measure the height h
1
of the disc springs and
use these values as a basis when defining the
final height of the springs (as compressed condi-
tion).
❑
Re-install the disc springs and tighten the nuts
with the tool. Tighten the nuts until the set value
of compression (h
1
–h
2
) of disc springs is
achieved, see Table 2.
❑
If the leakage still occurs when the valve is pres-
surized, re-tighten the nuts but don't exceed the
value in the Table 2 by 50 % or do not fully com-
press the disc springs.
5
TESTING THE VALVE
Body tightness should be tested after valve reassembly
by applying a sufficiently high water pressure.
Pressure should be tested in accordance with an appli-
cable standard. Use the pressure required by the pres-
sure class or the flange bore. The valve should be in the
intermediate position during the test.
If the tightness of the closure member shall also be
tested, contact the manufacturer.
6
MOUNTING THE ACTUATOR
6.1
General
Different Metso actuators can be mounted on the
valves with suitable mounting parts and couplings.
Valves can be operated with M manual actuator and B1
series actuators, for example.
6.2
M actuator
❑
File off any burrs and clean the stem bore.
❑
Place the coupling over the stem. Note the cor-
rect position. The line at the end of the stem and
coupling indicates the direction of the ball flow
bore.
❑
Lubricate the coupling and the stem bore. Fasten
the bracket loosely to the valve.
❑
Slip the actuator carefully onto the coupling.
Avoid forcing it, since this may damage the ball
and seats.
❑
Lubricate actuator mounting screws and then
fasten all screws.
❑
Adjust the ball open and closed positions by
means of the stop screws located at the side of
the housing (see Fig. 21). The closed position
screw is nearest to the handwheel on the side of
the housing, and the open position screw is on
the opposite end. The turning directions are
marked on the wheel.
❑
Ensure correct functioning of the actuator. Turn it
to both open and closed positions. The yellow
arrow should indicate the direction of the ball
flow bore.
Table 2
Tightening of gland packing, D1F_G
D1F_G
Spring set
dia
Thread
No of studs
Compression
(h
1
-h
2
)
SIZE
mm
mm
02
25
3/8
4
2.5
03
31.5
1/2
4
3.2
04
35.5
1/2
4
3
06
40
5/8
4
4.7
08
50
3/4
4
3.8
10
50
3/4
4
4.6
12
71
1 1/8
4
6.1
14
71
1
4
6.7
16
71
1
4
7.6
18
80
1 1/4
4
5.5
20
80
1 1/2
4
8.4
24
80
1 1/2
6
6.6
Fig. 20.
Gland packing, D1F_G
dia
h
1
h
2
stud (24)
hexagon nut (25)
disc spring set (43)
gland (9a)
retainer ring (42)
packing (20)
graphite packing
compression ring (9b)
V-ring set or
CAUTION:
When you do pressure testing, use equipment
conforming to the correct pressure class!
Fig. 21
Open and closed positions of the valve
stop-screw for
CLOSED position
stop screw for
OPEN position
