... Produce by international standard Brass ball valve Brass ball valve: 1,Size: 1/4".3/8',1/2',3/4',1',11/ ... /2',2',21/2,3',4'2,Certificate: ISO9001 , CE 3,material: brass body , brass ball, steel handle 4)Temperature ... .Production step :1) purchasing the material and forged the semi-products .2) processing the semi ... -products in workshop .3) assembling the goods .4) testing the sealing ...