During discharge the operator must first place the outlet sprout around the ring and then press the plate to the ring using the two handles. When this is done the robe can be released. As the pressure during the first phase of the discharge of the new bigbag can be very lively, as dust emission vacuum extraction system can also be connected to the unit.
The plate/lid is moved up and down with the handles as can be seen in the picture, or with the use of pneumatic cylinders.