... C3771, C37000, CW614N, CW617N, etc.2. The valve is used for connecting or cutting off the medium in pipelines.It is easy ... in development and production of Copper Valves, Gas Valves, Gate Valves, Ball Valve, Radiator Valve, Stop Valve, Check Valve, Bibcock, Angle Valves, Brass Fitting, Copper Fitting,Cast Steel ...