... than 15 years experience about making double ball valve moulds.union ball valve has seven parts.We can make all ... clear communications.2. We can provide various of single/double Union valves, check valves, membrane valves, bottom valves, gate valves, ... various pipe fitting of elbow, coupling, tee, reduce, cap, union, flange, flexible connector, water supply and sewerage pipe fitting moulds, etc. made ...