ARI Armaturen ASTRA DN250-400 EN - Manual (Page 9)

Rev. 0040105004 0212 Page 9
Operating and installation instructions
ASTRA
®
DN250-400:
- If the spindle (pos. 4) starts leaking, tighten the stuffing box (pos. 17) with the hexagonal
nut (pos. 23) until leaking stops.
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.
ATTENTION !
- Retighten the stuffing box packing if required and re-pack it in good time.
- For safety reasons we recommend that valves only be repacked when
depressurised.
- See point 10.0 and 11.0 before dismantling the valve.
Fig. 6: Split packing ring
- When cutting the new packing von der
Schnur, make sure that the ends are cut
with a slant (see Fig. 6)
DN
hexagon nuts /
hexagon screws
Torque
(Nm)
250-400 M 24 340-410
-
ATTENTION !
It is essential that the safety regulations are observed when identifying faults.