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