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

Rev. 0040105005 0212 Page 9
Operating and installation instructions
ASTRA
®
Plus
- If the stem (pos. 4.2) starts leaking, tighten the bolted gland (pos. 12) until leaking stops
DN250-400:
- If the spindle (pos. 4.2) 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:
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. 9: Split packing ring
- When cutting the new packing von der
Schnur, make sure that the ends are cut
with a slant (see Fig. 9)
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