Elgi is a renowned manufacturer of industrial machinery and equipment, and one of their notable products is the two-stage LD (Lubricated Direct Drive) machine. The two-stage LD machine is a type of air compressor widely used in various industries for generating compressed air.

This compressor operates in two stages, which refers to the number of compression steps involved in the process. Each stage consists of a cylinder and a piston. The first stage compresses the air to an intermediate pressure, while the second stage further compresses the air to the desired final pressure.