不銹鋼球閥 銅製球閥 鐵制球閥 鋼制球閥 球鐵制球閥 V型球阀 PN40SZA AK3TMM T T4L T4T TB TN TKW TKT (F)Z AKSZA AKSZAW AKT AKTN TH TM TN AKTNP GT TG 1 2 3 4