ARI Armaturen STOBU PN63-160 EN - Manual (Page 14)

Page 2-14 Rev. 0040102002 0213
Operating and installation instructions
STOBU
®
PN63-160
- If the valve stem / stem unit (pos. 4) leaks, gradually tighten the stuffing box seal (pos. 6)
evenly in increments by means of the hex. nuts (pos. 19) until leaking stops.
- Replace stuffing box packings only after the system has cooled down and the pressure in
the plant has been relieved.
In the case of corrosive or aggressive mediums, drain and ventilate the valve before
replacing the packing.
- 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 a
new gasket (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 !
- Refer to point 10.0 and 11.0 before dismantling the valve.
- 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.
- When the valve is operated, there is a crushing hazard between the valve plug
and the body.
- Only carry out maintenance work in the pipework when the valve has been
secured from operation (the actuator has been disconnected from the mains
supply and secured from reactivation.)
fig. 15: Split packing ring (pos. 6)
- When cutting the new packing (pos. 6) from
the roll, make sure that the ends are cut with
a slant (see fig. 15)
PN DN
hexagon nuts /
hexagon screws
Torque
(Nm)
63 - 160 10 - 25 M 16 50
±2
32 - 50 M 20 150
±3
65 M 20 140
+20
80 M 20 120
+20
100 M 24 220
+20