1, Checkup
Periodic checkup :
Inspect the disc or seat-ring at least once a year.
Make sure no disc is corroded or weared. (Fig.13)
Long no use after installation :
If the valve is not to be used for extended periods
after installation, open and close it manually or
automatically at least once two weeks.
Trouble happened :
If valve operates inproperly, foreign matter or damage
to seat-ring or something may be of the cause of the
problem. Please see the trouble shooting chart shown
in P.15.
2, Removal From Pipings
Warning
Check pressure inside pipings before
removing the valve from pipings :
When the valve removes from pipings, make sure the
pressure inside the pipings is lowered.
In case of fluid remaining inside the pipings, drain it
out
from the pipings. (Fig.14)
How to remove the valve from the pipings :
Set the valve in the closed position, then pull out
bolts and nuts. In doing this, remain a few bolts and
nuts in the lower holes of flanges to support the
valve. For easy-removal work,inserting jack bolts is
recommended.
Fig.13
Fig.14
9
