... ,SY/T6143-2004,ISO 5167-1,AGA Report No.3 2,The discharge coefficient is superior than Grade 0.5 3 ... -2004,ISO 5167-1,AGA Report No.3 etc standards. 2,Patent structure for orifice plate allocation, measuring with high precision ... .9,Product range:PN1.6~32MPaDN50 ~700mm Simple Type Orifice Meter Fitting