Supplement to operation instructions SIPOS SEVEN
2SL78 linear thrust unit
Page 4
Y070.518/EN
2 Mounting linear thrust unit
2.1 Mounting to valve
2
Mounting linear thrust unit
2 Mounting linear thrust unit
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Subsequent tasks may only be performed by qualified and trained personnel!
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Mounting of linear thrust unit is possible in any position.
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If there is a risk of crushing by moving parts, protective devices must be fitted.
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Touch up damage to paint finish after work on the device to avoid corrosion.
2�1 Mounting linear thrust unit to valve
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On delivery, the thrust rod of linear thrust unit is not completely retracted. When commissioning,
make sure that the valve is not under tension. The end position of the valve must not match the
mechanical end position of the thrust rod.
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The type of connection between the thrust rod of the linear thrust unit and the valve stem is
determined by the valve manufacturer via a coupling, depending on the valve.
How to proceed
1. Thoroughly clean and
de
grease contact
surfaces at linear thrust unit and valve (fig.,
pos. 1).
2. Place linear thrust unit ensuring that bores of
output mounting flange align perfectly with
the threaded bores of the valve flange.
Ensure that the spigot mates uniformly and
that the mounting faces are in complete
contact.
3. Fasten linear thrust unit with screws (strength
class min. 8.8):
– We recommend applying liquid thread
sealing material to the screws to avoid
contact corrosion.
– Fasten screws crosswise applying the
required tightening torque according to
the table below:
Tightening torques for screws of
tightening class 8�8
Threads
Tightening torque
M8
25 Nm
M10
51 Nm
M16
214 Nm
M20
341 Nm
4. Connect thrust rod using a coupling to the valve
stem.
The type of connection depends on the
valve and is determined by the valve manu-
facturer
Fig�: Mounting linear thrust unit