6.0 INFORMATION REGARDING USE
VL
2
VAL.130.--.M.EN Issue: A1
09.16
37
6.1 Production Start-up
Before starting up the valve, the operator in charge and authorized for the production must ensure the safety
devices installed are present, in working order and that the operating conditions are followed (inlet and outlet
spouts connected correctly or protected, etc.).
Especially with materials which tend to harden or become sticky through longer periods of storage ensure no
material or liquid is deposited on the shaft passages. In such a case clean the area thoroughly.
Start valve operation on empty. If valve works correctly, add material and proceed with regular operation.
Important
In case of excessive noise, strong vibrations, etc. stop the valve and report the problem to the person
in charge authorized to intervene to restore correct working.
Do not use the valve if damaged.
Operation
Depending on the type of plant, the valve can be operated either manually, electropneumatically or by a geared
motor. In the last two cases the valve is controlled by a remote control panel or by a local starter.
The weight of the material column must not exceed the resistance of the mobile valve parts.
Regular cleaning increases the life of the valve. This applies in particular to those application in which the ma-
terials handled either tend to harden or become sticky when stored for a longer period.
Important
The material weight on the sliding of the blade must never be greater than its maximum static torque.
As it is dif
¿
cult to calculate this weight exactly due to varying of material proprieties, as rule of thumb,
one may consider there are no problems with bulk density
1.13 kg/dm
3
in standard hoppers or silos.
When dealing with materials with higher bulk density check with the customer service.
Important
Operate the valve always when material is
À
owing.
These valves are speci
¿
cally provided for work with powdery or granular materials and not with liquid
ones.
