EB 8135/8136 EN
21
Maintenance
Valve size
65 to 80
Seat thread
M90 x 1.5
Tightening torque
1050 Nm
Place the top plug (3.1) and four sleeves
(11.1, 11.2, 11.3, 11.4) onto the plug
stem one after the other.
5. For diverting valves in DN 32 and larger,
insert the bottom plug into the bottom
seat.
Insert the gasket (1.2) into the body
flange. Carefully guide the plug stem (6)
into the bellows housing (5.2).
Hold the bottom plug in the seat to push
the plug stem in the middle through the
plug bore.
6.
First place the washer (12.1) and then
the pair of serrated retaining washers
(12.2) onto the plug stem, making sure
the coarsely serrated surfaces of the re-
taining washers face each other and the
radial ribs face outwards. Thread the nut
(12) onto the plug stem by hand.
Note:
For valves in DN 15 to 50, a special
tool designed to hold the washers
(12.1 and 12.2) can be ordered (see
section 5.3). Especially on valves in
DN 15 to 25, it is difficult to mount
the washers onto the plug stem due
to insufficient space.
7. Slightly pull out the bellows housing (5.2)
together with the bellows seal. Place an
open-end wrench at the side on the
hexagon (X) or at the flattened area of
the plug stem to hold the stem stationary.
NOTICE
Do not twist the bellows.
8.
Tighten the nut (12) to secure the plugs
and the sleeves:
Valve size
15 to 50
65 to 80
Nut (12)
15 Nm
25 Nm
9.
Remove the open-end wrench.
10. Place on the flange (5.4) and align it
with the bellows housing (5.2), while
making sure the gasket (1.2) is correctly
positioned.
11.
Fasten the nuts (1.1):
Valve size
15 to 25
32 to 50
65 to 80
Nuts (1.1)
M10
10 Nm
M12
30 Nm
M16
90 Nm
Tighten the coupling nut (5.1) with
80 Nm tightening torque.
12.
For DN 15 to 50, thread the lock nut
(6.2) and stem connector nut (6.1) onto
the top end of the plug stem again. Ad-
just the stem connector nut (6.1) to keep
the dimension of 50 mm from the top of
the bellows seal assembly (5) to the top
of the stem connector nut (6.1) after the
plug stem has been pushed completely
into the valve (see Fig. 15).
13. Mount the actuator onto the valve ac-
cording to the associated mounting and
operating instructions.
Summary of Contents for V2001 Series
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