CSA XLC 420, Руководство пользователя

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XLC 420
14
Problems solving
Problem Cause Solution
The main valve doesn
’t
close
The gate valves are closed Open the gate valves
The ball valves of the circuit are
closed Open the ball valves
There is no pressure inside
the main chamber Check the pressure coming
into the circuit
The diaphragm is damaged ( see
the following section
“checking the
diaphragm
”)
Replace the diaphragm
The mobile block is stuck due to
corrosion, deposits, cavitation Clean the main shaft
and replace all the
components affected by
deposit or corrosion
The mobile block is stuck due to
stones, pebbles, trapped inside the
main body Remove the material from
the valve
The plane gasket of the obturator of
the main valve and/or of the pilot is
ruined Replace the plane gaskets
The sealing seat is ruined Replace the sealing seat
The main valve
doesn
’t open
The gate valves are closed Open the gate valves
The ball valves of the circuit are
closed Open the ball valves
There is no pressure on the main
supply line Check the upstream
pressure
The pilot set point is higher than the
incoming pressure value Reduce the upstream
pressure set point by turning
the screw anticlockwise to
generate the opening
The mobile block is stuck due to
stones, pebbles, debris that remain
trapped inside the valve Clean the main shaft
and replace all the
components affected by
deposit or corrosion