Inner arc rib angle flat ring packing (QH-1 type), and won the 1995 national patent gold medal, its unique structure, excellent performance, has been successfully used in lubricating oil furfural refining, phenol and aromatic extraction, reverse extraction of aromatic LPG desulfurization, wastewater treatment and pyrolysis gas washing device. The characteristic parameters are as follows:

Inner arc rib angle rings characteristic data: