Kedi specializes in the research, development, production, and sales of vacuum equipment.

The JZJX Roots Vane Vacuum Unit is a combination of a Roots pump as the main pump and a vane pump as the preliminary pump. By using a vane pump as the preliminary pump, the Roots Vane Vacuum Unit overcomes the drawback of low gas extraction rate at certain pressures during vane pump operation, while retaining the advantages of the Roots pump's quick operation and high gas extraction rate. Due to its compact structure, large extraction rate, and small footprint, it can replace multiple mechanical vacuum pumps, making the Roots-vane pump unit widely used in industries such as vacuum smelting, electric capacitors, transformer vacuum heat treatment, pre-evacuation of vacuum coating equipment, and removal of gases from sealed containers that are low in oxygen, non-explosive, non-corrosive to metals, non-reactive with pump oil, and free of particulate dust.