4. Slightly pull out the bellows housing
(5.2) together with the bellows assem-
bly. Place an open-end wrench at the
side on the hexagon or the flattened part
(X) of the plug stem to hold the stem sta-
tionary and to prevent the bellows from
turning.
CAUTION!
Do not turn the bellows seal.
Firmly tighten the nut (12) to secure the
plugs and the sleeves:
Valve
DN 15 to 50
DN 65 to 80
Nut (12)
15 Nm
25 Nm
Remove the open-end wrench.
5. Align flange (5.4) to the bellows housing
(5.2), making sure the body gasket (1.2)
is correctly positioned. Tighten nuts
(1.1):
Valve
DN 15 to
25
DN 32 to
50
DN 65 to
80
Nuts (1.1)
M10
10 Nm
M12
30 Nm
M16
90 Nm
Firmly tighten the coupling nut (5.1) with
80 Nm.
6.
DN 15 to 50:
Thread the lock nut (6.2) and stem con-
nector nut (6.1) onto the top end of the
plug stem.
Adjust the stem connector nut (6.1) to
keep the dimension of 50 mm between
the top of the bellows assembly (5) and
the top of the stem connector nut (6.1)
when the plug stem is completely in-
serted in the valve. Refer to the dimen-
sional diagram on page 23.
Mount the actuator following the instructions
in the corresponding mounting and operat-
ing instructions.
4.2
Replacing the seat and plug
When replacing the seat and/or plug, we
recommend replacing the seal (5.3) at the
top and the body gasket (1.2) at the bottom
of the bellows housing as well.
Maintenance–replacing parts
12
EB 8135/8136 EN
AB
A
B
12.2
12
12.1
1.1
6.1
6.2
5.3
5
5.2
X
5.4
1.2
4.2
4.3
5.1
3.2
Fig. 7 · Mixing valve DN 32 to 50
