Established in 1970s, Quanzhou Yuji(KROS) Valve Manufacturing Co., Ltd. is a major manufactures of valves such as butt-clamp center-wiring butterfly valves, bi-eccentric butterfly valves, flange butterfly valves, butterfly model check valves, plunger valves, and ball valves, etc. It is a member of China Association of Water Supply, Drainage, Heating and Air-conditioning under China State Ministry of Construction and also a member of China Association of General Mechanical Valve Industry.

The company has its own CAD center, testing center, complete sets of machines and equipment for valve processing and assembly lines, and has passed the British Lloyd Vessel ISO9001 quality management system and thus acquired its ISO9001 quality certificate.