... is superior than Grade 0.5. 3,ENP on orifice plate, guide plate, etc trims, prefect corrosion resistance and abrasive resistance. 4 ... 5,Has the features of valve type orifice throttle device. 6,Can replace and maintain orifice plate, little space required, high cost ... of various medium, can be divided into non-sulphur resistant type, sulphur resistant type. Advanced Type Orifice Plate Pressure Device