Electric Butterfly Valve: 1.5"~24", PNI0/16 End ... EN 558-1 Top flange: ISO 5211 Electric Butterfly Valve:1)High Quality, Low Prcie and Fast Delivery. ... ISO9001:2008 CE,WRAS, NSF, TS.Brief Introduction:Butterfly valve is mainly consisted of body, stem, disc, seat ... so on. On off and controlling flow of valve are made by turning stem and disc together ... .5"~24" PNI0/16 Cast Iron Wafer Electric Butterfly Valve