Off the clearwater decanting phases the CROWN® Clarified Water Decanter Type DK/W is located over the level of the maximum water level and consequently ensures the function of an emergency overflow system.
At the beginning of a clearwater decanting phase the inlet structure will be lowered down to the actual (maximum) water level supported by an electrical winch. The inlet structure automatically opens its inlet slot approximately 10-20 cm under the water level.
The depth of immersion can be adjusted anytime by changing the level of the two floats. At the moment when the wanted depth of immersion has been reached, the bottom plate automatically sinks away from the upper inlet structure and consequently the inlet slot will be opened with its pre-adjusted height. The hydraulic discharge power of the inlet structure at least is a consequence of the combination of the slot height and the depth of immersion.
Because of the horizontally floating of the inlet structure during the complete decanting process the clear water can be discharged without any energy consumption until the minimum water level has been reached.
After the finalization of the clear water decanting phase the inlet structure will be lifted up to the emergency overflow level and so it can be used as an emergency overflow system until the next decanting phase will be started.