Shanghai GAIRS Machinery Co.,Ltd. is a joint-stock business integrating science, industry and trading and is committed to the R&D and manufacturing of universal machinery. It is the pioneer developing single-screw compressor in China. the major drafter of national standard of General Oil Injecting Single-screw Air Compressor and the industrial standard of General Water Injecting Single-screw Air Compressor, the single-screw air compressor production/export base designated in the 11th Five-year Plan of the national compressor industry, vice-chairman unit of China General Mechanical Industry Association, vice-director unit of China General Mechanical Industry Association Compressor Branch, member unit of China Compressor Standardization Technology Committee,National Contract-honoring&Promise-keeping Enterprise and one of China's Top 500 Machinery Units. Gairs water-lubricating oil-free single-screw air compressor passed the TUV certification.