... .Only produce mould 2.describe:union ball valve 3.type:single,double,thread,butterfly,brass ball 4.material: ppr, pvc,abs, ... more than 15 years experience about making double ball valve moulds.union ball valve has seven parts.We can make ... fast, long, excellent, chemical, pressure, traditional, easy clean, single , double, vertial, horizontal, perfect, small, big, thinkness, inch, structure, surface, ...