Shanghai Petro Valves Factory is one of leading manufacturer and wholesaler of Gate Valves, Pulp Valves, Relief Valves, Plug Valves, Ball Valves, Exhaust Valves, Check Valves, Plug-in Valves, Shut Off Valves, Butterfly Valves, Blind Plate Valves, Balance Valves, Water Level Valves and Hydraulic Control Valves, Strainer Valves/Filters and Needle Valves. http://www.topval.cn/Product-Ball-Valve-QY341.htm