OVERFILL PREVENTION DEVICE. Mechanism. A. Where to place it ?. The OPD is compatible with all tanks equipped with manhole plates. 1. 1. The OPD has to be set on the filling pipe inside the tank. 2. 1. Manhole plate. 1. 1. 2. B. Technical characteristics. 3. 4. THE FLOAT. 1.
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The OPD is compatible with all tanks equipped with manhole plates .
The OPD has to be set on the filling pipe inside the tank.
THE BALANCE WEIGHT
THE BALANCE SHAFT
Red area = crossing liquid area
Balance shaft n°1
Balance shaft n°2
The float is in low position and the piston in the high position.
The liquid flows through the OPD body (red area).
The float gradually rises according to the tank filling level.
The balance Weights are carried along by the rise of the balance shaft on the float.
The piston partially obstructs the flow which enables the increase of the hydraulic pressure in the chamber.
2) THE CLOSURE (level N1)
The hydraulic pressure let the Balance weights breaking away from the balance shaft. They finish their rise independently to the float while the piston sits on its seat.
The N1 level is reached and ensures a full closure.
The different steps of the emptying.
In the event of accidental decanting, repeated emptying operations or failure to comply with the flows stipulated by current standards, the overfill prevention device can reach a maximum level Nmax which prevents any further filling until the liquid level has fallen in the tank.
All our OPD are certified ATEX (protection II Gc IIB T6), are complied with the 94/9/CE directive and with the European norm EN 13616.
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