1 T 70 en
5
3
INSTALLATION AND USE
3.1
General
Remove the flow bore protectors and check that the
valve is clean inside. Clean the valve if necessary.
3.2
Installing in the pipeline
Flush or blow the pipes clean before mounting the
valve. Impurities, sand and parts of welding electrodes
may damage the ball and seats surfaces.
There are three marks to indicate the open-closed posi-
tion of the valve.
❑
an indicator on the actuator's drive centre
❑
a groove at the end of the ball stem
❑
the keyway of the ball stem
If you feel uncertain about the indicator, check by the
groove and the keyway.
The valve can be mounted in any position.If possible,
mount the valve in such a position that the actuator can,
if necessary, be detached without removing the valve
from the pipeline. The actuator must not touch the pipe-
line, as pipeline vibrations may damage it or cause dis-
turbance.
3.2.1
Assembly of welding end valve
The valves are mounted in the pipeline by using stand-
ard welding methods.
When welding or annealing the joints, assure that the
temperature of body in PTFE or the rubber sealings is
not higher than that allowed for this type of sealing
material, e.g. 120 °C. The increase of temperature can
be prevented by winding wet protection cloth around
the body during the welding. Fig. 7.
Valves with welding ends are, if necessary, supported
by flaky, arched supports on the machined part or pref-
erably (Fig. 8) on the part of pipeline next to the valve.
After welding, the piping should be carefully cleaned
and flushed before operating the valve.
After trial operation, the valve should be left in the
'Open' position until the process is started up.
If the valve is found to jam during test operation, open it
and flush again with a powerful flow.
3.3
Actuator
The valve open/closed position is indicated as follows:
❑
by an indicator on the actuator
or
❑
by a groove at the end of the ball shaft (parallel to
the ball flow opening).
If there is any uncertainty about the indicator, check the
ball position by the groove.
The actuator should be installed in a manner that allows
plenty of room for its removal.
CAUTION:
When handling the valve or the valve package as a
whole, bear in mind the weight of the valve or the
entire package!
NOTE:
Use screws, nuts, bolts and gaskets equivalent to the
fastenings used elsewhere in the pipeline. Center the
flange gaskets carefully when fitting the valve
between flanges.
NOTE:
Do not attempt to correct pipeline misalignment by
means of flange bolting or welding.
Fig. 6
Supporting the valve
Fig. 7
Valve body covered with wet protection cloth
during welding
Fig. 8
Supporting the welding end valve
NOTE:
When installing the actuator on the valve, make sure
that the valve package functions properly. Detailed
information on actuator installation is given in Section
6 or in the separate actuator instructions.
