Zhejiang Chenggao Valve Co., Ltd (former Oubei Chenggong Valve Fact- ory)lies in the national famous ˇ°Town of Pump and Valve ˇ±----oubei, Y- ongjia.It specializes in scientific research, manufacturing and selling of various ball valves of API.GB. hard sealed and soft sealed ones. The co- mpany has experienced for several years in valve manufacturing, it holds excellent equipment and perfect testing esta..