... 15 years experience about making double ball valve moulds.union ball valve has seven parts.We can make all ... valves, gate valves, locking valves, deflation valves, IBC valve, three way valve, water tapes, etc., made of ABS, U-PVC, ... traditional, easy clean, single , double, vertial, horizontal, perfect, small, big, thinkness, inch, structure, surface, tempreture, MAX, MIN, connection, certificate, ...