Information
Experience showed that it is difficult to fasten screws or nuts of size M30 or larger
at defined torques. There is a risk that the worm gearbox might shift radially with
regard to the valve mounting flange. To improve adhesion between valve and gearbox
we recommend applying a thin film of Loctite 243 (or similar threadlocking adhesive)
to screw threads.
6.
Fit gearbox. If required, slightly turn gearbox until splines of coupling engage.
Figure 13:
Information
Ensure that the spigot (if provided) fits uniformly in the recess and that the flanges
are in complete contact.
7.
If flange bores do not match thread:
7.1 Slightly rotate handwheel until bores line up.
7.2 If required, shift gearbox position by one tooth on the coupling.
8.
Fasten gearbox with screws.
Information: We recommend applying liquid thread sealing material to the
screws to avoid contact corrosion.
9.
Fasten screws crosswise to a torque according to table.
Table 5:
Tightening torques for screws
Tightening torque [Nm]
Threads
Strength class 8.8
2,600
M36
4,000
M42
19
GS 315 – GS 500
GZ 30.1 – GZ 40.1
Assembly
