WIKA LGG Betriebsanleitung Seite 14

5. Commissioning, operation
Install the sight glass level indicator without stresses.
■
In the selection of the mounting material (sealings, screws, washers
■
and nuts), take the process conditions into account. The suitability
of the sealing must be specified with regard to the medium and its
vapours. In addition, ensure it has corresponding corrosion resist-
ance.
EN
For rotatable designs, the corresponding threaded connections must
■
be loosened by approx. 2 turns. Once the sight glass level indicator
has been aligned, tighten the threaded connection again to 25 Nm.
Close valves and shut-off, drain and vent fittings
■
Valve with quick closing lever
Closing in a clockwise direction
Test the screw connections of the sight glass.
■
Tighten the screw connections with a torque spanner to the specified
values from the table. The sequence for the systematic tightening of
the screws is illustrated in the following sketch.
14 Operating instructions, sight glass level indicator, model LGG
Valve with handwheel
Closing in a clockwise direction