various types of marine flange and threaded connection cast copper, stainless steel stop valve, stop check valve, check valve, gate valve, plug valve, butterfly valve, ball valve, sea valve, fire hydrant, pressure gauge valve and manual, pneumatic quick closing valve series more than 300 specifications; and the production of gb, cb, cbm marine air pipe head, mud box, coarse water filter and other pipeline accessories series products, and also for military ships set of air conditioning series ventilation butterfly valve.