... NPT, etc, 100% Leakage Test Brass gate valves,forged brass gate valve,gate valve,Brass valves,1,Gate valve Body BRASS: CW614N, CuZn39Pb3, CW617N ... own copper bar Factory of Group.2) Every valve put through a six-step QC process before delivery.Material Control, ... . Specialized in development and production of Copper Valves, Gas Valves, Gate Valves, Ball Valve, Radiator Valve, Stop Valve, Check Valve, ...