Detailed Operation - SelfClimat DN 50 NT Instructions De Montage

Detailed operation

OPERATING PRINCIPLE OF THE SELF CLIMAT NT AND STAINLESS STEEL OVERFILL PREVENTION DEVICES
1) OVERFILL PREVENTION DEVICE IN THE REST POSITION
- The float is in the bottom position.
- The piston is in the top position (fully open).
- The drain ports are completely open.
2) THE CLOSING PROCESS BEFORE THE L1 LEVEL
- The progressive rise in the level inside the tank causes the float to rise.
- This causes the progressive closure of the piston.
- This piston partially closes the drain ports.
- The float continues to rise.
- The drain ports are closed.
- The increasing hydraulic pressure causes the complete closure of the piston.
3) AT THIS POINT THE LEVEL IS REACHED: THE OVERFILL PREVENTION DEVICE IS FULLY CLOSED
- The piston totally closes the drain ports.
- The float is in the top position.
4) CLOSE THE LORRY VALVE A ND PROCEED TO THE ADDITIONAL AIR INLET
5) RESIDUAL VOLUME
After closing the lorry valve and proceeding to the additional air inlet, the residual pressure on the piston is
cancelled out. At this moment:
- The float is kept submerged.
- The piston rises partially.
- The drain ports are partially open.
This partial opening of the drain ports allows any residual liquid upstream of the appliance to flow out.
It is possible to calculate the residual volume accepted, bearing in mind that the difference in height allowed is
approximately 20 mm after level L1.
50 mm
Top of manhole
Release valve (Type NT)
LEVEL L1
Float
Rest position
15/30