D490H006,D490H007,D493H086,D493H087,D493K088,D494K012,490/492/493/494型双气动蝶阀
D490H006,D490H007,D490K008,D490H009,D490K010,D490K011,D490K012, D492H066,D492H067,D492K068,D492H069,D492K070,D492K071,D492K072, D493H086,D493H087,D493K088,D493H089,D493K090,D493K091,D493K092, D494H006,D494K008,D494H009,D494K010,D494K011,D494K012,