XLC 470
18
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The clogging can be located between the seat and obturator if the indication rod is in closed
position and the flow continues, or between the sealing seat and cap if the valve does not reach
the complete opening. Before proceeding to dismantling the cover, it is suggested to do some
manual opening and closing operations putting the main chamber under pressure and discharging
it. This operation proved to be enough in some situations to flush the dirt downstream. If not take
the cover apart.
3) Friction of the shaft
One of the more frequent causes of the mobile group movement obstruction are the
corrosion and deposits on the main shaft causing friction. They can be due to particles (conveyed
from the water) or to limestone deposits (for extremely hard water) that in the long run cause the
jamming of the main shaft on the guiding devices, because of the high friction value.
Should that be the case simply proceed to a proper cleaning leaving it in a muriatic acid solution
5% as long as necessary, s
houldn’t that be sufficient then proceed with a fine abrasive cloth until
the deposit is completely removed.
4) Plane gasket
The valve must close watertight once the pressure has entered the main chamber and if we have
enough pressure to do it which is at least 0,5 bar acting on the pilot in addition to headloss during
outflow
, if that doesn’t happen proceed with the inspection of the plane gasket performance
assuring the closure between the obturator and the sealing seat.
5) Sealing seat
One more reason that could be responsible for the improper closure of the valve may be the
sealing seat, occurring in case of dirt and deposits or damaged due to cavitation. In these cases
we must proceed with an accurate inspection to clean the component by means of sandpaper
then polish it, if the problem can’t be solved on the spot please contact our technical support for
immediate assistance.
