... No.3 2,The discharge coefficient is superior than Grade 0.5 3,ENP 1,Meet the requirements of GB/T2624 ... with high precision, the discharge coefficient is superior than Grade 0.5. 3,ENP on orifice plate, guide plate, etc trims ... be divided into non-sulphur resistant type, sulphur resistant type. Advanced Type Orifice Plate Pressure Device