Mianyang Tianxuan Valve System Co., Ltd. , a Hi-new-tech. enterprise, located in Mianyang of Sichuan province, well-known as China Science &Technology City, covering an area of 85 acres (including 11,000 m2 buildings), was founded in 1993, by following the trends of systematic and modularized internal combustion engine parts for the international market. it is specialized in ICE valve parts like valve rotators, valve guides and seats, valve spring retainers and cotters, valve bridges, roller rocker arms etc.