ARI Armaturen Metallic sealing EN - Manual (Page 8)

Page 8 Rev. 0040110000 0410
Operating and installation instructions
Change over valve
- Valve service life can be improved by leakage checks.
Mounting of the bonnet:
- Before reassembling the unit, remember that the bearing surface must be cleaned and 2
new gaskets (pos. 9) must be inserted.
- Set the cover in place
- Tighten the hexagon nuts (hexagon screws for valves of cast iron) evenly crosswise.
- Tightening torque‘s for hexagon nuts / screws:
fig. 4: Split packing ring
- When cutting the new packing from the roll,
make sure that the ends are cut with a slant
DN hexagon nuts /
hexagon screws Torque
(Nm)
15- 32 M 10 15-30
40- 65 M 12 35-50
80-100 M 16 75-100
125-150 M 16 80-120
200 M 20 150-200
250 M 24 340-410