9.0 INFORMATION REGARDING FAULTS
VL
2
VAL.130.--.M.EN Issue: A1
09.16
50
9.2 Check-list in case of fault
If you have been unable to solve the problem on the valve even after having carried out the operations sug-
gested in paragraph “Trouble-shooting” please contact the plant technician/installer/or the Manufacturer.
If technical assistance is required, in addition to the valve data, the plant technician/installer or Manufacturer
will also need information concerning the plant in which the valve is installed, its installation and its working, for
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Obviously many of the checking operations which are requested have already been performed in the various
steps during installation, testing and start-up of the valve concerned.
Danger - Warning
Before carrying out any operation
³
set the valve concerned in safety
´
(see
³
Glossary and terminol-
ogy
´
), operate according to the indications on the
³
Operation and Maintenance Manual
´
and in accord-
ance with and in compliance with the standards in force as regards health and safety.
1) Information necessary
a)
Description of problem;
b)
Material handled;
c)
Photo showing the entire valve and how it is installed;
d)
Valve type;
e)
Does the valve start up without any problem after long shutdowns?
f)
Is the outlet spout free of encrustations which reduce the cross-section?
g)
Is the vent of the weigh hopper into which the valve discharges the material sized correctly; is it clean and
does it work properly?
2) Checking the silo
a)
What is the inclination of the cone?
b)
How much material does the silo contain?
c)
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d)
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How many nozzles or aeration pads are preset on the cone, how are they arranged and what is their dis-
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What is the operating pressure and the operating cycle?
e)
Is the silo provided with a vibrator or a hammering device?
What is the operating cycle?
NOTE:
If the valve got clogged with product in a silo which cannot be emptied, cut the bottom of the scraper
and make sure the adjustable seal system is in 0 position.
