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13
Remove the gland nuts and one stud, mount the
retaining plates (42) and the removed stud and place
the disc spring sets (150) on the gland studs. Tighten
the nuts (18) so that the disc springs are compressed to
the height Hc, see Table 1. Lock the nuts with locking
compound e.g. Loctite 221.
Observe the same caution in reinstalling the valve
that you used in dismantling it. Please also note the
instructions in Section 3.
4.9.2
Sizes 3" - 6" (XB/XC)
Place the valve in a standing position on the pipe
flange end so that the insert thread points upwards.
Use a surface that will not scratch the flanges.
Screw the insert (2) into the body (1). Tighten the insert
slightly to ensure that it has gone all the way in. Mark the
position, e.g. with a felt tip marker against the body at the
point of the mark on the insert, Fig. 32. Unscrew the insert
and remove it from the body.
S seats:
Place the back seal (63) in the ball seat (7); see Fig. 24.
Place the seat in the body (1).
Soft seats (X, T):
Place the seat in the body (1). See Fig. 25.
K seats:
Place the back seal (63) into the body counterbore.
Then place the seat (7) into the body counterbore,
see Fig. 26.
Lock the seat into the body using a special tool. See
section 4.9.3 for instructions.
Place the back seal (63) in the ball seat (7); see Fig. 26.
Place the seat in the insert (2). Lock the seat with a
special tool. See Section 4.9.3 for instructions.
H seats:
Place the back seal (63) into the body counterbore.
Then place the seat (7) into the body counterbore,
see Fig. 27.
Lock the seat into the body using a special tool. See
Section 4.9.3 for instructions.
Place the back seal (75), back-up ring (76), spring (62)
and the seat (25) into insert, Fig. 27.
G seats:
Place the back seal (63) into the body counterbore.
Then place the seat (7) into the body counterbore,
see Fig. 28.
Lock the seat into the body using a special tool. See
Section 4.9.3 for instructions.
Place the back seal (75), back-up ring (76), spring (62)
and the seat (25) with back seal (64) into insert, see
Fig. 28.
All seat versions:
Place the shaft partly inside the body from above
and place the thrust bearings (70) on the shaft from
inside the body. Place the spline driver (4) on the
shaft spline and lock it with a pin (50). Put the ball (3)
in its position so that the spline driver is in the ball
slot. Pull the shaft to make sure that the pin locks the
spline driver properly to the shaft. Place the packing
(69), the stud (14) and the gland (9) in their position.
Place the nuts (18) on the studs (14) and screw down
them gently.
Place the body gasket (65) and gasket (135) into the
body.
S seats:
Place the seat on the ball.
Soft seats (X, T)
Place the seat on the ball.
All seat versions:
Carefully place the insert (2) in the body.
Do not drop the H or G seat from the insert!
Screw the insert and seat assembly into the body.
This is easiest to do if the valve is horizontal. Tighten
the insert using a special tool until the cap reaches 2-
5 mm past the mark made earlier, Fig. 32.
To make sure that the ball lies properly between the
seats, turn the shaft slowly in both directions two or
three times.
Deform the packing rings by tightening the gland
nuts without disc springs to the torque T
t
, see the
value from Table 1, see Section 4.2.
Remove the gland nuts and one stud, mount the
retainer plates (42) and the removed stud and place
the disc spring sets (150) on the gland studs. Tighten
the nuts (18) so that the disc springs are compressed
to the height H
c
, see Table 1. Lock the nuts with lock-
ing compound e.g. Loctite 221.
Observe the same caution in reinstalling the valve
that you used in dismantling it. Please also note the
instructions in Section 3.
Table 5
Recommended tightening torques of the body stud
nuts
Recommended tightening torques (Nm)
Thread
Torque
Thread
Torque
M12
50
1/2"
60
M14
100
5/8"
120
M16
150
3/4"
200
M20
250
7/8"
300
M24
400
1"
450
M30
900
1 1/8"
600
–
–
1 1/4"
800
NOTE: Threads must be well lubricated.
Fig. 32
Marking for the insert position
As marked
After final assembly
Summary of Contents for XB/XC Series
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