rial flows into the filling barrel in small flow. When the filling quantity of the filling scale reaches the quantitative value, the controller of the filling scale sends out the stop signal, all the gun valve door of the filling scale close, the filling gun lifts up to the top of the filling scale. The controller confirms that the filling weight is in inside the accuracy range, it exits from this filling process, and prepare the next filling cycle. The operator moves away the filled barrel thro