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ARI Armaturen Metallic sealing EN User Manual

Page 8

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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