Zhejiang Yongjia Chenggao Valve Manufacturing Co., Ltd. is a specialise producted API, GB. hard seal and soft seal ball valves' factory. it has been over ten years old. The company has perfect hardware and software facilities and professional researchers. In developing stage of the program, the program team undertook design for technics and engineering, adopted series of CAD and processing simulation system, the valves are qualified testing by Machinery Industry Quality Inspection Center for Valve Products and have obtained ISO9001: 2000 quality system certificate.