The first enterprise awarded import & export rights by our national electrical and mechanical committee; The first manufacturer entity awarded expanded Export Right by the state council of mechanical and electrical dept. in China; The products are in conformity with related international standards, standards of the developed countries and passed National certification; The only manufacturer in China adopting particular technologies in heat treatment in whole casting, surface treatment, quenching, Phosphates, chromate coating, enlarge the steel pipe, processing the thin wall liners and the bore using plateau crosshatch honing method.