Hunan Tyen Machinery Co., Ltd is an automotive parts and accessories manufacturer based in Hengyang, China, founded in 1993. It produces and sells engine turbochargers, valves, piston rings, cooling fans, thermostats, and other engine and valve train components, along with mechanical parts and machining services. The company also operates a research and production base for engine parts such as special turbochargers and cooling fans. Its products are used in passenger cars, commercial vehicles, construction and agricultural machinery, generator sets, and other fields.