6
4 KH 70 en
3.6
Assembly positions
(Vertical/Inclined Pipe)
The knife gate valves can be assembled in all positions;
however, certain aspects must be taken into account:
Fig. 4
Positions 1.2 and 3:
In these positions, it is recommended
to make a suitable support, because, due to the weight of
the actuator, deformations may arise and this can lead to
operating problems in the valves.
Once the valve has been installed, check that all the screws
and nuts have been correctly tightened and that the whole
valve action system has been correctly adjusted (electrical
connections,pneumaticconnections, instruments…).
All our valves are tested at its facilities, however, during the
handling and transport the screws on the packing gland
can come loose and must be re‐ tightened.
Once the valve is installed in the pipeline and it has been
pressurised, it is very important to check for any leakages
from the packing gland to the atmosphere.
In the event of a leakage, tighten the nuts on the packing
gland crosswise until the leakage stops, ensuring that there
is no contact between the packing gland and the gate.
A very high tightening torque on the packing gland’s nuts
can lead to problems, such as an increase in the valve’s
torque, reduction in the packing’s working life, or the
breaking of the packing gland. The tightening torques are
indicated in Table 2:
Tabla 2
Once the valve is installed in its place, check that the
flanges and electrical and pneumatic connections are
secure. If the valve has electrical accessories or you are in an
ATEX zone, earth connections must be made before
operating it.
If you are in an ATEX zone, check the continuity
between the valve and the pipeline (EN 12266‐2,
annex B, points B.2.2.2. and B.2.3.1.). Check the
pipeline’s earth connection and the conductivity between
the outlet and inlet pipelines.
Tightening torques for packing gland screws
DN50 to DN125
25 Nm
DN150 to DN300
30 Nm
DN350 to DN1400
35 Nm
