The equipment is suitable for percolation operation in traditional Chinese medicine, food, chemical industry, etc. It is composed of tank body, taper body, oval seal head (or flat cover), pneumatic residue discharging door, and pneumatic operation bench. It features equal solvent distribution and convenient residue discharging.

The percolation method is to add continuously leaching solvent into the rough powder of medicine materials to make it filtrate the medicine powder; the percolated liquid is discharged at the bottom outlet. During the percolation, the layer percolation method of solvent's filtering into the medicine material is to add continuously leaching solvent into the medicine material layer to make the solvent pass through the medicine material layer from top to bottom and dissolve large amount of soluble matters. After that, the concentration increases, and it will move downward after the density increases. The leaching solvent at the upper layer or the thin leaching liquid will exchange the position and produce good concentration difference to make the scattering carried out smoothly.