... ,ISO 5167-1,AGA Report No.3 2,The discharge coefficient is superior than Grade 0.5 3,ENP ... for orifice plate allocation, measuring with high precision, the discharge coefficient is superior than Grade 0.5. 3,ENP on ... . 5,Has the features of valve type orifice throttle device. 6,Can replace and maintain orifice plate, little space ... , sulphur resistant type. Advanced Type Orifice Plate Pressure Device