1. Above 10 years professional manufurer. 2. CE,WRAS and ISO9001 certificate 3. D71X--10/16Z/Q/C 4.Size ... can make all kinds of valves, gate valve,check valve,butterfly valve,ball valve,globe valve and so on.1)standard: BS5163,BS5150,BS5155, DIN3352,DIN3202, ISO5752 ... in advance, or L/C at sight 2013 New Butterfly Valve