... 2) Ball valve: quick-installed ball valve, without resort-liquid ball valve, without dead angles ball valve, threaded three and ball valve, flange ball valve ( ... tank), 1pc with internal threaded ball valve, 2pc with internal threaded ball valve, 3pc with internal threaded ball valve3) Check valve: Welded ... ( if possible), 5,drawings (for customized design). 6. Polish requirements( surface accuracy)