3 R 74 en
7
4.2.1
RA series
In gland packing, V-ring set (20), tightness is ensured by
pressure caused by the wave spring (32). See Fig. 11.
The gland packing must be replaced when leakage
occurs through the gland (9).
❑
Make sure the valve is not pressurized.
❑
Remove the actuator from the valve shaft acc. to
the instructions given in the actuator’s manual.
❑
Remove the key (13) from the drive shaft (11).
Unfasten the screws (25) and the gland (9).
❑
Remove the retainer (30) from the drive shaft.
Avoid to damage the shaft’s surface.
❑
Remove the upper sheet ring (31).
❑
Remove the old packing rings (20) using a
pointed pin. Avoid to damage the sealing sur-
faces.
❑
Remove the lower sheet ring (31) and the wave
spring (32).
❑
Clean the packing ring counterbore.
❑
Mount the spring (32) and the lower sheet ring
(31) into the counterbore.
❑
Mount the new packing rings (20) one by one on
the shaft (11) using the gland (9) as a tool. The
keyway and shoulder must not damage the pack-
ing rings.
❑
Mount the upper sheet spring (31).
❑
Mount the retainer (30) in the groove of the shaft.
Avoid to damage the surface of the shaft.
❑
Fasten the gland (9) with the screws (25) and
tighten them according to the Table 2.
❑
Mount the key (13) on the shaft (11).
4.2.2
RE / RE1 series
In gland packings, tightness is ensured by the contact
between the gland follower and the packing rings. See
Fig. 12.
The gland packing (20) must be replaced if leakage
occurs even after the hexagon nuts (25) have been
tightened.
❑
Make sure that the valve is not pressurized.
❑
Detach the actuator and bracket according to
the instructions in Section 4.3.
❑
Remove the key (13).
❑
Remove the hexagon nuts (25), disc spring sets
(32), one stud (24), retaining plates (30) and
gland follower (9).
❑
Remove the packing rings (20) from around the
shaft using a knife or some other pointed instru-
ment without scratching the surfaces.
❑
Clean the packing ring counterbore.
❑
Place the new packing rings (20) over the shaft
(11). The gland follower may be used for pushing
the rings into the counterbore. Do not damage
packing rings in the shaft keyway. See Fig. 12.
❑
Screw down the removed stud.
❑
Deform the packing rings first by tightening the
gland nuts (25) without disc springs to the torque
Tt, see the value from Table 3.
❑
Remove the gland nuts and one stud. Mount the
retaining plates (30) with the text UPSIDE on top
and the removed stud and place the disc spring
sets (32) on the gland studs. Tighten the nuts
(25) so that the disc springs are compressed to
the height Hc, see Table 3. Lock the nuts with
locking compound e.g. Loctite 221. See Fig. 12.
❑
Check leakage when the valve is pressurized.
Fig. 11
Gland packing
Table 2
Torques for gland screws
Thread
Torque, Nm
Width across flats
M6
M8
UNC 1/4
UNC 5/16
8
18
8
18
4 mm
5 mm
5/32"
3/16"
30
9
25
32
13
11
31
20
31
Fig. 12
Gland packing, RE/RE1
CAUTION:
For safety reasons the retainer plates MUST
always be installed according to the above instruc-
tions.
A
H
c
24
30
32
9
20
25
