Self Climat DN 50 Installation Instructions Manual page 14

Detailed operation
OPERATING PRINCIPLE OF THE SELF CLIMAT
COUNTERWEIGHT OVERFILL PREVENTION DEVICE
The float is in the bottom position.
-
The piston is in the top position (fully open).
-
- The drain ports are completely open.
1) THE CLOSING PROCESS BEFORE THE L1 LEVEL
- The float starts to rise progressively under the
effect of the hydraulic pressure.
The 2 counterweights are moved by spacer N°1
-
of the float carrier.
- The piston partially closes the drain ports.
The float continues to rise.
-
Half way along the stroke the 2 weights separate
-
from spacer N°1 and are moved by spacer N°2
of the float carrier.
- The weights finish rising under the effect of the
hydraulic pressure and move the float with
them.
- The drain ports are closed.
- The piston is in the fully closed position under
the effect of hydraulic pressure.
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2) AT THIS POINT THE LEVEL IS REACHED : THE
OVERFILL PREVENTION DEVICE IS FULLY CLOSED
3) THE FLOAT IS KEPT SUBMERGED AT THE L1 LEVEL
4) CLOSE THE LORRY VALVE AND THE USUAL AIR
INLET
5) DRAINING THE HOSE
After closing the lorry valve and the additional air
inlet, the progressive elimination of the residual
pressure on the piston is achieved via :
- the escape holes in the piston chamber casing
- the opening of release valve.
To this progressive decompression, is added the
weight of the two counterweights applied to spacer
N°2 of the float carrier which accelerates the par-
tial reopening of the piston and thus allows the
hose to drain completely.
6) CLOSURE AT LEVEL Lmax
Accidental pouring - excessive hose emptying
- failure to observe the flow volumes laid down
by the standard in force.
In this case the submerged float continues its
stroke, moving the two weights with spacer N°2
of the float carrier.
The piston once again provides complete closure.