ARI Armaturen STOBU PN 40 EN - Manual (Page 10)

Page 2-10 Rev. 0040102000 1113
Operating and installation instructions
STOBU
®
PN16-40
- 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:
8.0 Troubleshooting
In the event of malfunction or faulty operating performance check that the installation and
adjustment work has been carried out and completed in accordance with these Operating
Instructions.
If malfunctions cannot be eliminate with the help of the following table
“9.0 Troubleshooting table”, the supplier or manufacturer should be consulted.
fig. 7: Split packing ring
- When cutting the new packing from the roll,
make sure that the ends are cut with a slant
(see fig. 7).
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
250-400 M 24 340-410
500 M 27 340-410
-
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.