Installation Of The Atex Version - Gemü 490 Original Einbau- Und Montageanleitung

12. Insert bolts 4 in all holes in the fl ange.
13. The union is dependent on the body
confi guration:
Gently tighten the bolts 4 with nuts 5
diagonally (on wafer version); threaded
connections (on lug version).
5 4
14. Fully open the disc and check the
alignment of the piping.
15. Tighten nuts 5 diagonally until the
fl anges fi t tightly on the body.
Observe permissible tightening torque of
the bolts.
Nominal Tightening
size torque
DN 40 25 Nm
DN 50 35 Nm
DN 65 40 Nm
DN 80 45 Nm
DN 100 50 Nm
DN 125 60 Nm
DN 150 70 Nm
DN 200 85 Nm
DN 250 95 Nm
Nominal Tightening
size torque
DN 300 105
DN 350 145
DN 400 165
DN 450 185
DN 500 215
DN 600 230
DN 700 280
DN 800 380
DN 900 460
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11.3 Installation of the ATEX
version
Potential
equalisation
1. Install the butterfl y valve, see chapter
11.2 "Installing the standard version".
2. Connect the earthing cable of the
butterfl y valve to the earth terminal of the
plant.
3. Check the resistance between earthing
cable and operator shaft (value <10
typical value <5 Ω).
Ω,
6
490